JP5849494B2 - Electronic device manufacturing method, electronic device, and electronic apparatus - Google Patents

Description

The present invention relates to a method of manufacturing an electronic device, an electronic device, about your and electronic equipment using them.

Conventionally, as a manufacturing method of an electronic device, a plurality of wiring portions (also referred to as wiring patterns) of an electronic device package are arranged and formed on a lead frame formed of a conductive material such as copper (Cu) according to a certain rule. For example, a semiconductor element is mounted on the lead frame, electrical connection (for example, wire bonding) is performed, the whole is sealed with resin, and then cut with a dicing blade, etc., and separated into individual electronic device packages. The system which performs is used (for example, refer patent document 1).
Further, in Patent Document 2, as an example of a piezoelectric device using the same manufacturing method as described above, a piezoelectric vibrator and an IC chip (semiconductor element) are housed in a device package and separated into pieces. A manufacturing method is disclosed.

JP 2003-37236 A JP 2007-43462 A

In any of the above manufacturing methods, after mounting elements such as semiconductor elements and piezoelectric vibrators on the lead frame, the whole is sealed with resin and molded and solidified, and then the lead frame and resin are cut by a dicing blade or the like. Do. Therefore, the lead frame material (underlying metal) is exposed on the cut surface of the lead frame. The cut surface (exposed surface) from which the lead frame material is exposed reacts with oxygen in the air, and an altered layer such as an oxide film is formed on the surface. The cut surface (exposed surface) of the lead frame is a surface that forms a solder fillet (soldering shape) when an electronic device or the like is soldered to a mounting substrate. However, the surface on which the deteriorated layer is formed has poor solder wettability, so that it is difficult to form a solder fillet for increasing the soldering strength, and there is a possibility that the soldering strength to a mounting substrate such as an electronic device may be weakened. It was.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Mode 1] A method of manufacturing an electronic device according to the present mode includes a pad part, a mounting electrode part provided with at least one of a recess and a through hole surrounded by the pad part in plan view, Preparing a lead frame having a recess and a metal film disposed on a surface of the mounting electrode portion facing at least one region of the through hole; and connecting an electronic component to the lead frame; a step of covering the pad portion contact and said metal layer in the mold, with not covering the pad portion and the metal film, so as to cover at least a portion of at least a portion and the electronic component of the mounting electrode portion, the sealing forming a part, concave to the pad portion, the mounting electrode portion, and cutting the sealing portions, only one of the pad portions in a plan view is open And characterized by having a, a step of forming at least one of the through holes.
According to the manufacturing method of the electronic device of the present embodiment, the mounting electrode portion provided with the pad portion and at least one of the concave portion or the through hole surrounded by the pad portion is formed, and at least one of the concave portion and the through hole is formed. After preparing a lead frame in which a metal film is formed on the surface of the mounting electrode part facing the region, an electronic component is connected. The surface of the above-described pad portion is a surface that faces the mounting substrate when the mounting electrode portion of the electronic device is soldered to the mounting substrate, and is also referred to as a pad surface below.
Moreover, a recessed part is a hollow with a bottomed hole shape, and a through hole is a hollow with a shape penetrating from the pad surface to the back surface of the mounting electrode part. The concave portion and the through hole provided in the pad portion may be provided in combination.
After that, the electronic component and the mounting electrode part are covered with a sealing material so as to expose at least a part of the electronic component and the pad surface of the mounting electrode part and the metal film are exposed, and after the sealing part is formed, the mounting is performed. The electrode part, the pad part, and the sealing part are cut.
Mounting the electrode portion, pad portions, and cutting the sealing portion by performing so as to expose the direction (side surface) of the metal film crosses the pad surface, it surrounds at least hand recess and the through hole in plan view the pad Only one of the parts is excised. As a result, the cross section of the metal film and base metal plate formed when forming the lead frame is exposed on the side surface of the electronic device. When the electronic device or the like is soldered to the mounting substrate, this metal film becomes a soldering surface, in other words, a surface on which a solder fillet (soldering shape) is formed.
Therefore, the electronic device obtained by the manufacturing method of the electronic device of this embodiment does not have a deteriorated layer due to being cut in the metal film provided on the surface of the mounting electrode portion. Further, since a metal film is formed in advance on the surface of the mounting electrode portion facing at least one region of the recess and the through hole, solder wettability is good and a solder fillet can be easily formed. As a result, it is possible to improve the soldering strength of the electronic device with respect to the mounting substrate and to improve the soldering stability .
[Mode 2 ] In the method of manufacturing an electronic device according to the above mode, the step of covering the pad part and the metal film with a mold includes the mold being an elastic member, and the mold being covered with the pad part and the metal film. It includes a step of pressing against at least one.
According to this embodiment, the sealing portion is formed while pressing the mold of the elastic member against at least one of the pad portion and the metal film. Thereby, it can prevent more reliably that a sealing material flows into the surface of at least one of a pad part and a metal film. Further, since the sealing portion is formed in a state where the elastic member covering the pad portion is deformed, in other words, the pad portion is biting into the elastic member, a step is generated between the pad portion and the sealing portion. Thus, the pad portion can have a so-called stand-off function. Accordingly, it is possible to more reliably and stably solder the electronic device to the mounting substrate.
[Mode 3 ] In the method for manufacturing an electronic device according to the above mode, at least one of the recess and the through hole is formed by etching.
According to this embodiment, at least one of the recess and the through hole is formed by etching. For example, the etching process generates less processing stress as compared to press processing and the like, and can process at least one of the concave portion and the through hole while maintaining the flatness of the pad portion. Thereby, since the degree of adhesion between the pad portion and the mold can be increased in the step of forming the sealing portion, it is possible to more reliably prevent the sealing material from flowing into the pad portion.
The electronic device according to [Embodiment 4] This embodiment, pad portion, mounting the electrode portions that have a recess only one of the pad portion in a region adjacent to the pad portion in a plan view is open, and the recess A lead frame having a metal film disposed on a surface of the mounting electrode portion facing the semiconductor device, an electronic component electrically connected to the mounting electrode portion, and the pad portion and the entire metal film are covered. And a sealing portion that covers at least a part of the mounting electrode part and at least a part of the electronic component.
In the electronic device of this embodiment, the metal film disposed on the surface of the mounting electrode facing the recess formed when the lead frame is formed is exposed on the side surface. When the electronic device is soldered to the mounting substrate, this metal film becomes a soldering surface, in other words, a surface on which a solder fillet (soldering shape) is formed.
Therefore, the metal film of the mounting electrode portion does not have a deteriorated layer due to cutting, so that solder wettability is good and a solder fillet can be easily formed. As a result, it is possible to improve the soldering strength of the electronic device with respect to the mounting substrate and to improve the soldering stability.
Further, in the electronic device of this embodiment, since the metal film is formed at the same time as the outer surface of the lead frame when the lead frame is formed, a process for forming the metal film again is not required, and the cost can be reduced.
[Embodiment 5] An electronic device according to the above embodiment, the recess is a plurality alongside Dei wherein Rukoto the mounting electrode portion in a plan view.
According to this embodiment, since there are a plurality of concave portions in one pad portion, the surface area of the mounting electrode portion facing the concave portion is increased, and the solderability can be further improved.
[Mode 6 ] An electronic device according to the present mode is characterized in that the electronic device according to the above mode includes a vibrator and a circuit element having at least a function of causing the vibrator to oscillate.
On the side surface of the electronic device of the present embodiment, the surface of the mounting electrode facing the recess provided with the metal film formed when forming the lead frame is exposed. When the piezoelectric device is soldered to the mounting substrate, this metal film becomes a soldering surface, in other words, a surface on which a solder fillet (soldering shape of solder) is formed.
Therefore, the metal film provided on the surface of the mounting electrode portion facing the recess does not have a deteriorated layer due to cutting, so that solder wettability is good and a solder fillet can be easily formed. . As a result, it is possible to improve the soldering strength of the electronic device with respect to the mounting substrate and to improve the soldering stability.
In addition, the electronic device of this embodiment can form the metal film simultaneously with the surface of the lead frame when forming the lead frame, so that the process of forming the metal film on the surface of the mounting electrode part facing the recess is unnecessary. Cost reduction can be achieved.
In addition, since the circuit element and the mounting electrode portion are connected to one surface of the vibrator and covered with a sealing body, a small and thin electronic device can be provided.
[Mode 7 ] The electronic device described in this mode is characterized by using the above-described electronic device.
According to the electronic device described in this embodiment, a solder fillet is formed when mounted on a circuit board by soldering because the metal film provided in advance exists on the surface of the mounting electrode part facing the recess. As a result, the soldering strength can be improved and the connection reliability can be improved.
Therefore, an electronic apparatus using the above-described electronic device has stable connection reliability and can improve impact resistance.
Application Example 1 An electronic device manufacturing method according to this application example includes a pad portion, a mounting electrode portion provided with at least one of a recess and a through hole surrounded by the pad portion, and the recess. And preparing a lead frame having a metal film disposed on a surface of the mounting electrode portion facing at least one region of the through hole, connecting an electronic component to the lead frame, Forming a sealing part so as not to cover the pad part and the metal film, and to cover at least a part of the mounting electrode part and at least a part of the electronic component; the pad part; and the mounting electrode part And cutting the sealing portion.

According to the manufacturing method of the electronic device of this application example, the mounting electrode part including the pad part and the recessed part provided with at least one of the recessed part or the through hole surrounded by the pad part is formed, and the recessed part is formed. After preparing a lead frame having a metal film formed on the inner surface, electronic components are connected. The surface of the above-described pad portion is a surface that faces the mounting substrate when the mounting electrode portion of the electronic device is soldered to the mounting substrate, and is also referred to as a pad surface below.
Moreover, a recessed part is a hollow with a bottomed hole shape, and a through hole is a hollow with a shape penetrating from the pad surface to the back surface of the mounting electrode part. The recess may be either a recess or a through hole, or a combination of both.
Thereafter, the electronic component is encapsulated, and the side surface of the electronic component and the mounting electrode part is covered with a sealing material so as to expose the pad surface and the recessed part of the mounting electrode part, and the sealing part is formed. The formed dent part, pad part and sealing part are cut.
Cutting the pad portion, the recessed portion, and the sealing portion is performed so that the inner surface of the recessed portion is exposed in the direction (side surface) intersecting the pad surface, so that one of the pad portions surrounding the four sides of the recessed portion is excised. Is done. As a result, on the side surface of the electronic device, the inner surface of the hollow portion where the metal film formed when forming the lead frame is provided as it is and the cross section of the base metal plate are exposed. And
When soldering an electronic device or the like to a mounting board, the metal film provided on the inner surface of the recess serves as a soldering surface, in other words, a solder fillet (solder skirt shape).
It becomes the surface which forms.
Therefore, the electronic device obtained by the manufacturing method of the electronic device of this application example does not have a deteriorated layer due to being cut on the inner surface of the recess portion provided on the surface of the mounting electrode portion. Further, since a metal film is formed in advance on the inner surface of the recess, the solder has good wettability and a solder fillet can be easily formed. As a result, it is possible to improve the soldering strength of the electronic device with respect to the mounting substrate and to improve the soldering stability.

Application Example 2 In the method for manufacturing an electronic device according to the application example described above, the surface of the pad portion and the recess portion are covered with a mold prior to the step of forming the sealing portion.

According to this application example, the sealing portion is formed after covering the surface of the pad portion and the recess portion so as to adhere the mold, so that the sealing material is prevented from flowing into the surface of the pad portion and the recess portion. Can do. Thereby, since the exposure of the surface of a pad part is securable, it becomes possible to perform soldering to the mounting board | substrate of an electronic device more stably.

Application Example 3 In the electronic device manufacturing method according to the application example described above, in the step of forming the sealing portion, the surface of the pad portion and the recess portion are covered with an elastic member, and the pad portion is covered with the elastic member. The sealing part is formed while pressing so as to bite.

According to this application example, the sealing portion is formed while pressing so that the pad portion bites into the elastic member covering the surface of the pad portion. Thereby, it can prevent more reliably that a sealing material flows into the surface of a pad part, and a hollow part. Further, since the sealing portion is formed with the pad portion biting into the elastic member covering the surface of the pad portion, a step can be generated between the surface of the pad portion and the sealing portion. In other words, a so-called stand-off function can be provided. Accordingly, it is possible to more reliably and stably solder the electronic device to the mounting substrate.

Application Example 4 In the method for manufacturing an electronic device according to the application example, the recess is formed by etching.

According to this application example, the depression is formed by etching. In the etching process, for example, the processing stress is less generated than in the press process, and the recess part can be processed while maintaining the flatness of the surface of the pad part. Accordingly, since the degree of adhesion between the surface of the pad portion and the mold can be increased in the step of forming the sealing portion, it becomes possible to more reliably prevent the sealing material from flowing into the surface of the pad portion. .

Application Example 5 In the electronic device described in this application example, a mounting electrode part including a pad part and a recessed part in which three of four sides are surrounded by the pad part and the remaining one is opened is formed in the concave part. An electronic device using a lead frame in which a metal film is formed, the electronic component connected to the mounting electrode portion, and the electronic component and the mounting electrode portion while exposing a surface of the pad portion and the concave portion And a sealing portion that covers the side surface of the concave portion, wherein the inner surface of the recess and the cross section of the base metal plate are exposed.

In the electronic device of this application example, the inner surface of the recess provided with the metal film formed when forming the lead frame as it is and the cross section of the base metal plate are exposed on the side surface. When the electronic device is soldered to the mounting substrate, the metal film provided on the inner surface of the recess serves as a soldering surface, in other words, a surface that forms a solder fillet (soldering shape). Become.
Therefore, since there is no deteriorated layer due to cutting on the inner surface of the concave portion provided on the surface of the mounting electrode portion, the solder wettability is good and the solder fillet can be easily formed. As a result, it is possible to improve the soldering strength of the electronic device with respect to the mounting substrate and to improve the soldering stability.
Further, in the electronic device of this application example, the metal film on the inner surface of the recess is formed at the same time as the outer surface of the lead frame when the lead frame is formed. It is possible.

Application Example 6 In the electronic device according to the application example described above, a plurality of the recesses are provided side by side in the pad portion.

According to this application example, since there are a plurality of recesses in one pad portion, the surface area is increased, and the solderability can be further improved.

Application Example 7 A piezoelectric device according to this application example is the electronic device according to the application example described above.
It has a piezoelectric vibrator and a circuit element having at least a function of causing the piezoelectric vibrator to oscillate.

On the side surface of the piezoelectric device of this application example, the inner surface of the recess provided with the metal film formed when the lead frame is formed as it is and the cross section of the base metal plate are exposed. When the piezoelectric device is soldered to the mounting substrate, the metal film provided on the inner surface of the recess serves as a soldering surface, in other words, a surface that forms a solder fillet (soldering shape). Become.
Therefore, since there is no deteriorated layer due to cutting on the inner surface of the concave portion provided on the surface of the mounting electrode portion, the solder wettability is good and the solder fillet can be easily formed. Accordingly, it is possible to improve the soldering strength of the piezoelectric device with respect to the mounting substrate and to improve the soldering stability.
In addition, since the metal film on the inner surface of the recess can be formed at the same time as the lead frame surface when forming the lead frame, the piezoelectric device of this application example eliminates the need to form a metal film on the inner surface of the recess again, reducing costs. Can be achieved.
In addition, since the circuit element and the mounting electrode portion are connected to one surface of the piezoelectric vibrator and covered with a sealing body, a small and thin piezoelectric device can be provided.

Application Example 8 The electronic apparatus described in this application example uses the above-described electronic device.

According to the electronic apparatus described in this application example, since the metal film provided in advance exists on the side surface (inner surface of the recess) of the mounting electrode portion, when the solder fillet is mounted on the circuit board by soldering, It is easy to form, and the soldering strength can be improved, and the connection reliability can be improved.
Therefore, an electronic device using the above-described electronic device or piezoelectric device has stable connection reliability and can improve impact resistance.

The schematic structure of the semiconductor device as an electronic device is shown, (a) is a top view, (b) is AA sectional drawing of (a) (1st Embodiment). The outline of the lead frame used for the semiconductor device of a 1st embodiment is shown, (a) is a top view and (b) is an A1-A1 sectional view of (a). (A)-(c) is process explanatory drawing which shows the outline of the manufacturing method of the semiconductor device of 1st Embodiment. It is a figure explaining the individualization step (cutting process) of 1st Embodiment, (a) is a top view, (b) is A2-A2 sectional drawing of (a). The crystal oscillator as a piezoelectric device is shown, (a) is a top view, (b) is BB sectional drawing of (a) (2nd Embodiment). (A)-(d) is process explanatory drawing which shows the outline of the manufacturing method of the crystal oscillator of 2nd Embodiment. The graph which shows the soldering intensity | strength to the mounting board | substrate of the crystal oscillator of 2nd Embodiment. The press type | mold used for the sealing process of the modification 1 is shown, (a) is a front sectional view in which the upper die has a two-layer structure, and (b) is a front sectional view in which the upper die and the lower die each have a two-layer structure. FIG. 6 is a front sectional view showing a second modification of the sealing process. It is a figure explaining the sealing part formed by the modification 1 or the modification 2, (a) is a front sectional view which shows a pressing pressure state, (b) is the formed sealing part and mounting electrode part Front sectional view showing correlation. The top view which shows the application example of the recessed part formed in a mounting electrode part. The top view which shows an example of the mounting electrode connection lead which connects between the mounting electrode parts of the modification 3. FIG. The top view which shows an example of the mounting electrode connection lead which connects between the mounting electrode parts of the modification 4. FIG. 1 is a perspective view illustrating an outline of a mobile phone as an example of an electronic apparatus according to the invention. 1 is a circuit block diagram of a mobile phone as an example of an electronic apparatus according to the invention. 1 is a perspective view showing an outline of a personal computer as an example of an electronic apparatus according to the invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. In the first embodiment, a configuration of a semiconductor device as an electronic device and a manufacturing method thereof will be described.
In the embodiment, a configuration of a crystal oscillator as a piezoelectric device and a manufacturing method thereof will be described.
In addition, in embodiment, although it is the structure provided with the recessed part as a hollow part, it is not limited to this, The structure which combined the through hole or the recessed part and the through hole as a hollow part may be sufficient.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1A and 1B show a schematic configuration of a semiconductor device as an electronic device, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 2 shows an outline of a lead frame used in a semiconductor device, (a) is a plan view, and (b) is (a).
It is A1-A1 sectional drawing of). FIG. 3A to FIG. 3C are process explanatory views showing the outline of the method for manufacturing a semiconductor device, and are shown in cross-sectional views corresponding to the A1-A1 cross-sectional view of FIG. 4A and 4B are diagrams for explaining a singulation step (cutting process) in the method for manufacturing a semiconductor device, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line A2-A2 of FIG.

[Constitution]
First, a schematic configuration of a semiconductor device as an electronic device will be described with reference to FIG.
The semiconductor device 10 includes a mounting electrode unit 11, a semiconductor element 14 as an electronic component connected to the mounting electrode unit 11, a part of the mounting electrode unit 11, and a sealing material provided so as to enclose the semiconductor element 14. For example, it has the sealing part 16 by resin. In addition to the resin, the sealing material may be an insulating material such as glass.

The mounting electrode portion 11 is a part of a lead frame described later, and is provided at four locations in this example. The lead frame includes a base metal plate made of a plate having a thickness of about 0.25 mm, such as copper (Cu) or a copper alloy containing copper as a main component. The mounting electrode part 11 has a pad part 12 whose one surface is exposed from the sealing part 16.
The pad portion 12 has a function of performing soldering or the like so as to face the mounting substrate when connected to a mounting substrate (not shown) on which the semiconductor device 10 is mounted later by soldering or the like.

The mounting electrode portion 11 is provided with a concave portion 17 from the substantially central portion of the pad portion 12 in plan view to the side surface of the crystal oscillator 50. The concave portion 17 has a step of about 0.18 mm from the surface of the pad portion 12, and the sealing portion 16 is not provided inside thereof, in other words, the inner surface is exposed to the outside. Further, the mounting electrode portion 11 is provided with a step portion 18 having a step of about 0.18 mm from the surface of the pad portion 12 on the opposite side of the recessed portion 17 via the pad portion 12 in plan view.

The mounting electrode portion 11 includes a metal film 13 on the surface including the step portion 18 or the recess portion 17. The metal film 13 is preferably formed of a surface layer of a material that can maintain solder wettability for a longer period of time than the base metal, for example, gold. Specifically, on the surface of the base metal plate, nickel (Ni) as the base layer, palladium (Pd) as the intermediate layer on the surface of the base layer, and gold (Au) as the surface layer on the surface of the intermediate layer, Each is configured as a plating layer formed by electroless plating. Note that the structure of the metal film 13 shown here is an example, and other metals may be used as long as they have a function as an electrode layer, a soldering layer, or the like.

In this example, the thickness of the mounting electrode portion 11 is 0.25 mm, and the steps of the recess 17 and the step portion 18 are 0.18 mm. However, this dimension value is an example and the rigidity of the lead frame is maintained. Other dimension values can be used as long as the dimension values can be used.

The semiconductor element 14 is connected to a surface opposite to the one surface that becomes the pad portion 12 of the mounting electrode portion 11. The semiconductor element 14 includes an electronic circuit (not shown) inside an active surface which is one surface thereof. The active surface of the semiconductor element 14 is provided with metal bumps 15 electrically connected to the electronic circuit.

The metal bump 15 is made of gold (Au) or the like. The semiconductor element 14 is electrically connected to the mounting electrode unit 11 by bonding the metal bump 15 and the metal film 13 provided on the surface of the mounting electrode unit 11.

The sealing portion 16 is the above-described pad portion 12 (more specifically, the metal film 13 formed on the surface of the pad portion 12, but in the following description, the surface of the pad portion 12 unless otherwise specified. And the recessed portion 17 is exposed, and the mounting electrode portion 11 and the semiconductor element 14 are sealed.
The sealing portion 16 of this example has a substantially rectangular parallelepiped shape, and is formed of, for example, a thermosetting resin using a transfer molding method.

Next, an outline of a method for manufacturing a semiconductor device will be described with reference to FIGS.
[Lead frame configuration]
Prior to the description of the manufacturing method, the configuration of the lead frame will be described with reference to FIG. In FIG. 2A, the metal film 13 shown in FIG. 2B is omitted for easy understanding of the configuration.
As shown in FIGS. 2A and 2B, the lead frame 20 is a pad extracted from a thin plate (thickness of about 0.25 mm) such as copper (Cu) or a copper alloy containing copper as a main component. Mounting electrode portion 1 including a portion 12, a step portion 18 having a step from the surface of the pad portion 12, and a concave portion 17.
1 are arranged. The step portion 18 and the recess portion 17 are formed with a step of about 0.18 mm from the surface of the pad portion 12. Therefore, the thickness of the step part 18 and the recessed part 17 is about 0.07 mm.

In this example, four mounting electrode portions 11 form one set and form the constituent members of the semiconductor device 10 shown in FIG. 1, and the lead frame 20 of this example has 1120 semiconductor devices 10 on one lead frame 20. Is a sheet in which sets that can be formed are arranged.
Adjacent mounting electrode portions 11 are connected to each other by joint leads 19. The joint lead 19 extends from the step portion 18 and has the same thickness as the step portion 18. In this example, a pair of mounting electrodes 11 (11a, 11b) adjacent in the Y direction are connected to each other by two joint leads 19, and the mounting electrode portions 11 (11a, 11c, and 11b, 11d) adjacent in the X direction are connected.
) Are connected by one splicing lead 19.
It should be noted that the thickness of the joint lead 19 is not necessarily the same as the thickness of the stepped portion 18 as long as the arrangement of the mounting electrode portions 11 can be maintained.

The semiconductor device 10 described above includes four mounting electrode portions 11 (11a, 11b, 11c, 11d).
) Are configured as one set.

Although not shown, a frame frame is provided on the outer peripheral portion of the lead frame 20, and all the mounting electrode portions 11 are connected by the joint leads 19 including the frame frame.
Are connected.
In this example, the mounting electrode portion 11 has a thickness of 0.25 mm, and the steps of the recess 17 and the step portion 18 are 0.18 mm. However, this dimension value is an example, and the rigidity of the lead frame 20 is increased. Other dimension values can be used as long as they can be maintained.

[Production method]
A method for manufacturing the semiconductor device 10 will be described with reference to FIGS.
<Steps for preparing the lead frame>
The steps for preparing the lead frame 20 will be described with reference to FIG.
First, a thin plate such as copper (Cu) or a copper alloy is prepared, and a concave portion 17 is formed in the central portion of a portion where the mounting electrode portion 11 will be formed later, and step portions 18 are formed on both sides of the concave portion 17. A portion corresponding to the joint lead 19 is also formed at the same time, but the description thereof is omitted here.
The concave portion 17 and the stepped portion 18 are configured to include a bottom portion and a side surface in a direction intersecting the bottom portion (also referred to as an inner surface including the bottom portion and the side surface). The bottom portion and a surface facing the bottom portion (of the lead frame material) The back surface is formed so as to be thinner than the thickness of the surface of the pad portion 12 and the surface facing the surface (the back surface of the lead frame material). That is, the recess 17 and the step 18
Is formed by half-etching so as to have a step with the surface of the pad portion 12.

This half-etching process (etching process) generates less processing stress compared to other processing methods such as press processing, and maintains the flatness of the surface of the pad portion 12 while maintaining the recesses 17 and the step portions 18. Processing can be performed. Thereby, in the step of forming the sealing portion 16 to be described later, since the adhesion between the surface of the pad portion 12 and the mold can be increased, the flow of the resin to the surface of the pad portion 12 can be more reliably prevented. Is possible.

Thereafter, the mounting electrode portion 11, the joint lead 19, and a frame frame (not shown) are left.
A so-called outer shape etching process is performed to form the outer shape of the lead frame material.
The lead frame material formed with the outer shape has, for example, nickel (Ni) as an underlayer on its outer surface, palladium (Pd) as an intermediate layer on the surface of the underlayer, and a surface layer on the surface of the intermediate layer. A metal film 13 made of gold (Au) is formed by an electroless plating method or the like. The metal film 13 having such a configuration is preferable because it is excellent in both the bonding property with a gold bump used for connection to a semiconductor element or the like, or the solderability during mounting.

As a result, the lead frame 20 shown in FIG.
The metal film 13 is a part that requires the metal film 13, for example, the surface of the pad portion 12, the inner surface including the bottom and side surfaces of the recess 17, the surface of the stepped portion 18, and the semiconductor element of the mounting electrode portion 11. 14 (see FIG. 1) may be provided at least at the connection site.

<Semiconductor element connection step>
A step of connecting the semiconductor element 14 as an electronic component to the mounting electrode portion 11 formed on the lead frame 20 will be described with reference to FIG.
The connection between the semiconductor element 14 and the mounting electrode part 11 is achieved by connecting a gold bump 15 formed on the active surface of the semiconductor element 14 to a metal film 13 formed on the mounting electrode part 11 on the back surface of the pad part 12, for example with gold. Join using eutectic bonding with gold. Although the semiconductor element 14 of the present example has been described by using the semiconductor element 14 joined across the four mounting electrode portions 11, the number of the mounting electrode portions 11 used may be any number.

<Sealing part formation step>
The step of forming the sealing portion 16 made of resin will be described with reference to FIG.
In this example, a description will be given of molding by a transfer molding method in which a lead frame (including connected elements) 20 is sandwiched between molds and a resin is pressed into a space.

First, the lead frame 20 in which the semiconductor elements 14 are arrayed and connected to a predetermined part in the above-described steps is sandwiched between the heated lower mold 25 and the upper mold 27.
The lower die 25 is provided with a lead frame receiving portion 26 so as to come into contact with the back surface of the mounting electrode portion 11 at a position facing the central portion of the recess 17 when the lead frame 20 is sandwiched.
Although not shown, when the recess is formed by a through hole instead of a recess, the lead frame receiving portion 26 covers the opening of the through hole on the back surface side of the mounting electrode portion 11 with the lead frame receiving portion 26. The area of the receiving surface is adjusted so that the resin does not flow into the through hole.
In the lead frame 20, the surface of the pad portion 12 is in contact with the upper die 27 and the back surface of the mounting electrode portion 11 is pressed by the lead frame receiving portion 26 of the lower die 25. Although other parts of the lead frame 20, such as a frame frame (not shown), are sandwiched while being pressed by the lower mold 25 and the upper mold 27, description thereof is omitted here.
Although not shown, a die having a flat sealing surface without the lead frame receiving portion 26 may be used as the lower die 25.

Then, a thermosetting resin that is heated and liquefied is injected into a space formed by being sandwiched between the lower mold 25 and the upper mold 27 while being pressed and cured, and then the lower mold 25 and the upper mold 27 are cured. And mold resin 16M is formed. At this time, the surface of the pad portion 12 is in close contact with the upper mold 27. Thereby, since the resin does not flow into the concave portion 17, the metal film 13 on the inner surface of the concave portion 17 is exposed.
Further, after covering the surface of the pad portion 12 with the upper mold 27, a resin is injected, and a mold resin 16M is injected.
Therefore, the injected resin can be prevented from flowing into the surface of the pad portion 12. That is, the surface of the pad portion 12 is in a state where the metal film 13 is exposed.

Thus, while exposing the surface of the pad portion 12 and the concave portion 17 of the mounting electrode portion 11,
The semiconductor element 14, the stepped portion 18 of the mounting electrode portion 11, the joint lead 19, etc. are molded resin 16M.
The sheet-like sealing part forming lead frame 21 (see FIG. 4) covered with the above is formed.
The mold resin 16M is the same component as the sealing portion 16, but in order to make the explanation easy to understand, the mold resin 16M that is separated into pieces is referred to as a sealing portion 16.

<Cutting step>
4A and 4B, the lead frame 20 and the mold resin 16M (sealing portion 16) are cut into pieces, in other words, the semiconductor device 1 as an electronic device.
A step of cutting the sheet-like sealing portion forming lead frame 21 in which 0s are arranged to form individual semiconductor devices 10 will be described.
As described above, the lead frame 20 of this example has a sheet shape in which 1120 semiconductor devices 10 are arranged. The lead frame 20 in which the molding resin 16M is formed on the lead frame 20 is cut to form 1120 individual semiconductor devices 10.

First, along the longitudinal first cutting portion 22ax shown in FIG. 4 (a), the diamond wheel 23, which is the cutting grindstone shown in FIG. 4 (b), is moved while rotating to cut the first cutting portion in the longitudinal direction. To do.
Next, it moves while rotating the diamond wheel 23 along the vertical second cutting portion 22bx to cut the second vertical cutting site. Thereafter, similarly, the cutting in the vertical direction is continued along the arrangement of the mounting electrode portions 11.
At this time, the vertical cutting position, for example, the vertical first cutting portion 22ax crosses the central portion of the concave portion 17 so that the inner surface of the concave portion 17 is exposed in a direction (side surface) intersecting the surface of the pad portion 12. Then, the lead frame 20 including the pad portion 12 and the like and the mold resin 16M are cut.
By this vertical cutting, the inner surface of the recess 17 and the cut surface of the base metal plate are exposed on the side surface of the separated semiconductor device 10 while being connected to the surface of the pad portion 12.

Subsequently, the first cut in the horizontal direction is similarly performed along the first horizontal cut portion 22ay that overlaps the joint lead 19 (see FIG. 2A) extending in the X direction, and the second horizontal cut portion is subsequently continued. 22b
Cut in the horizontal direction sequentially from y.
By these cutting processes, the semiconductor device 10 in which the surface of the pad portion 12 and the inner surface of the concave portion 17 are exposed from the sealing portion 16 is formed.

According to the semiconductor device 10 of this embodiment, the vertical cutting when the semiconductor device 10 is singulated is performed so that the inner surface of the recess 17 is exposed in a direction (side surface) intersecting the surface of the pad portion 12. Therefore, on the side surface of the semiconductor device 10, the inner surface of the recess 17 in which the metal film 13 formed on the surface of the lead frame 20 is provided as it is and the cut surface of the base metal plate are exposed. . When the semiconductor device 10 is soldered to the mounting substrate, the metal film 13 provided on the inner surface of the recess 17 becomes a soldering surface, in other words, a solder fillet (soldering shape of the solder) is formed. It becomes the surface to do.
Therefore, in the semiconductor device 10 obtained by the above-described manufacturing method, even if the solder wettability of the cut surface of the base metal plate is reduced due to the influence of oxidation or the like, the metal film 13 provides good solder wettability. Therefore, it is possible to reliably and easily form a solder fillet. As a result, it is possible to improve the soldering strength of the semiconductor device 10 as an electronic device with respect to the mounting substrate and to improve the soldering stability.

In the first embodiment described above, the semiconductor device has been described as an example of the electronic device. However, the present invention is not limited thereto, and may be a sensor device, a control circuit device, a power supply device, or the like having the same configuration.

(Second Embodiment)
The second embodiment will be described with reference to FIGS. 5 and 6. 5A and 5B show a schematic configuration of a crystal oscillator as a piezoelectric device, in which FIG. 5A is a plan view and FIG. 5B is a sectional view taken along line BB in FIG. 6 (a) to 6 (d) are process explanatory views showing an outline of a method of manufacturing a crystal oscillator, and are shown in cross-sectional views at positions corresponding to the A1-A1 cross-sectional line in FIG. 2 (b). Yes. Note that description and illustration of the same configuration and manufacturing method as those of the first embodiment may be omitted.

[Constitution]
First, a schematic configuration of a crystal oscillator as a piezoelectric device will be described with reference to FIG.
The crystal oscillator 50 includes a mounting electrode portion 51, a crystal resonator 60 as a piezoelectric vibrator connected to the mounting electrode portion 51, a semiconductor element 54 as a circuit element having at least a function of oscillating the crystal resonator 60, A part of the mounting electrode unit 51 and one surface of the crystal unit 60 are exposed, and a sealing unit made of resin provided so as to include the mounting electrode unit 51 excluding the exposed unit, the crystal unit 60, the semiconductor element 54, and the like. 56.

Since the mounting electrode unit 51 has the same configuration as the mounting electrode unit 11 of the first embodiment described above, a detailed description thereof will be omitted and an outline will be described.
The mounting electrode portion 51 includes a pad portion 52 whose one surface is exposed from the sealing portion 56, and a pad portion 52.
And a stepped portion 58 having a step and a surface of the pad portion 52 on the opposite side through the recessed portion 57 and the pad portion 52 in a plan view. It has been. The mounting electrode portion 51 has a metal film 53 formed on the surface including the step portion 58 or the concave portion 57.

The crystal unit 60 includes a package 61 including a package side wall 62 and a package side wall 62.
The conductive adhesive 6 is attached to the package 61 in the space formed by the lid 65 hermetically connected to the package 61.
4 has a crystal vibrating piece 63 connected by 4.
In the crystal resonator 60, an external electrode (not shown) provided on the back surface 66 of the package 61 and a surface opposite to the pad portion 52 of the mounting electrode portion 51 are connected.

In the semiconductor element 54, the back surface of the active surface is connected to the back surface 66 of the package 61 of the crystal unit 60. A bonding pad (not shown) provided on the active surface of the semiconductor element 54 and an external electrode (not shown) provided on the back surface 66 of the package 61 are electrically connected by a bonding wire 55. Further, another bonding pad (not shown) of the semiconductor element 54 and the step portion 58 are electrically connected by a bonding wire 55.

The sealing portion 56 is the above-described pad portion 52 (more specifically, the metal film 53 formed on the surface of the pad portion 52, but in the following description, the surface of the pad portion 52 unless otherwise specified. 1), the concave portion 57, and one surface of the lid body 65 of the crystal resonator 60 are exposed, and the mounting electrode portion 5 is exposed.
1. The semiconductor element 54, the crystal resonator 60, and the like are sealed. The sealing portion 56 of this example has a substantially rectangular parallelepiped shape, and is formed of, for example, a thermosetting resin using a transfer molding method.

Next, an outline of a semiconductor device manufacturing method will be described with reference to FIG.
[Lead frame configuration]
The lead frame 70 shown in FIG. 6A is the lead frame 20 of the first embodiment described above.
Since it is the same structure as, description is omitted.

[Production method]
<Steps for preparing the lead frame>
First, a lead frame 70 shown in FIG. 6A is prepared. Since this step is the same as the step of preparing the lead frame 20 of the first embodiment described above, description thereof is omitted.

<Quartz crystal connection step>
6B, the mounting electrode unit 5 in which the crystal unit 60 is formed on the lead frame 70 is used.
The step of connecting to 1 will be described.
The crystal unit 60 includes a crystal vibrating piece 63 in a package 61 and a lid 65.
Prepare an airtightly sealed product.
The crystal resonator 60 and the mounting electrode unit 51 are connected to an external electrode (not shown) provided on the back surface 66 of the package 61 and a surface of the mounting electrode unit 51 opposite to the pad unit 52. The crystal resonator 60 may be bonded across the two mounting electrode portions 51 or may be bonded across the three or more mounting electrode portions 51.

<Semiconductor element connection step>
A step of connecting the semiconductor element 54 to the back surface 66 of the crystal resonator 60 will be described with reference to FIG.
The connection between the semiconductor element 54 and the back surface 66 of the package 61 of the crystal unit 60 is performed using an adhesive or the like on the back surface of the semiconductor element 54. Then, a bonding pad (not shown) provided on the active surface of the semiconductor element 54 and an external electrode (not shown) provided on the back surface 66 of the package 61 are electrically connected by a bonding wire 55. Further, another bonding pad (not shown) of the semiconductor element 54 and the step portion 58 are electrically connected by a bonding wire 55.

<Sealing part formation step>
With reference to FIG. 6D, a step of forming a sealing portion (mold resin 56M) with resin will be described. In this example, a description will be given of molding by a transfer molding method in which a lead frame (including connected elements) 70 is sandwiched between molds and a resin is pressed into a space.
First, the lead frame 70 in which the crystal resonator 60, the semiconductor element 54, and the like are arrayed and connected to predetermined portions in the above-described steps is pressed (pressed) by the heated lower die 75 and the upper die 77.
While sandwiching.

The lower die 75 is provided with a lead frame receiving portion 76 so as to come into contact with the back surface of the mounting electrode portion 51 at a position facing the central portion of the recess 57 when the lead frame 70 is sandwiched.
Although not shown, when the recess is formed by a through hole instead of a recess, the lead frame receiving portion 76 has an opening in the through hole on the back surface side of the mounting electrode portion 51 so that the lead frame receiving portion 76 covers the opening. The area of the receiving surface is adjusted so that the resin does not flow into the through hole.
In the lead frame 70, the surface of the pad portion 52 is in contact with the upper die 77, and the back surface of the mounting electrode portion 51 is pressed by the lead frame receiving portion 76 of the lower die 75. It should be noted that other parts of the lead frame 70, such as a frame frame (not shown), are also sandwiched while being pressed by the lower mold 75 and the upper mold 77, but description thereof is omitted here.
Although not shown, a die having no lead frame receiving portion 76 and a flat sealing surface can be used as the lower die 75.

Then, a thermosetting resin that is heated and liquefied is injected into a space formed by being sandwiched between the lower die 75 and the upper die 77 while being pressurized and cured, and then the lower die 75 and the upper die are cured. 77 is released to form a mold resin 56M. At this time, the surface of the pad portion 52 is in close contact with the upper mold 77. As a result, since the resin does not flow into the surface of the pad portion 52 and the inside of the recess 57, the metal film 53 on the surface of the pad portion 52 and the inner surface of the recess 57 is exposed. The lid body 65 of the crystal unit 60 is in close contact with the lower mold 75.

As a result, the semiconductor element 54, the stepped portion 58 of the mounting electrode portion 51, the joint lead (not shown), etc. are exposed while exposing the lid 65 of the crystal resonator 60 and the surface of the pad portion 52 of the mounting electrode portion 51 and the recess 57. A sheet-like member (sealing member forming lead frame) covered with the mold resin 56M is formed. The mold resin 56M is the same component as the sealing portion 56. However, in order to make the explanation easy to understand, the mold resin 56M is separated into pieces of the sealing portion 56.
Call it.
In this embodiment, a mold is used as a mold, but any material of the mold may be used as long as it has a certain degree of rigidity. For example, a tape shape formed from a silicone resin, a heat resistant rubber, a polyimide resin, a fluorine resin, or the like. The elastic member can also be used.

<Cutting step>
In this step, the lead frame 70 and the mold resin 56M (sealing portion 56) are cut into individual pieces, in other words, a sheet-like member (sealing member) in which the crystal oscillators 50 as piezoelectric devices are arrayed. The member forming lead frame) is cut, and the individual crystal oscillator 5 is cut.
0.
Since this step is the same as the step of cutting and sealing the sealing portion of the first embodiment described above, description thereof is omitted.

According to the crystal oscillator 50 of the present embodiment, the vertical cutting when the crystal oscillator 50 is singulated is performed so that the inner surface of the recess 17 is exposed in the direction (side surface) intersecting the surface of the pad portion 12. Therefore, the metal film 53 formed on the surface of the crystal oscillator 50 when the lead frame 70 is formed is provided as it is, and the inner surface of the recess 17 and the cut surface of the base metal plate are exposed. When the crystal oscillator 50 is soldered to the mounting substrate, the metal film 53 provided on the inner surface of the recess 57 becomes the soldering surface, in other words, a solder fillet (solder skirt shape) is formed. It becomes the surface to do.
Therefore, the crystal oscillator 50 obtained by the above-described manufacturing method has improved solder wettability, and can easily form a solder fillet. As a result, it is possible to improve the soldering strength of the crystal oscillator 50 as a piezoelectric device to the mounting substrate, and to improve the soldering stability.

In the second embodiment described above, the crystal oscillator 50 has been described as an example of the piezoelectric device. However, the present invention is not limited to this. For example, a voltage controlled crystal oscillator (VCXO), a temperature compensated crystal oscillator (TCXO), The present invention can be applied to a piezoelectric oscillator such as a crystal oscillator with a thermostatic chamber (OCXO), a physical quantity sensor such as a gyro sensor, a pressure sensor, and an acceleration sensor, a crystal resonator that does not contain circuit elements, and a SAW device.

FIG. 7 is a graph showing the soldering strength of the crystal oscillator 50 formed in the above-described aspect of the second embodiment to the mounting board. FIG. 7 shows a crystal oscillator 5 formed in the aspect of the second embodiment.
Soldering to a mounting substrate of 0 (shown as an example in the drawing) and the piezoelectric oscillator described in the background art (hereinafter referred to as a conventional piezoelectric oscillator (shown as a conventional product in the drawing)) It is a graph which compares fixation strength and peeling strength.

As shown in FIG. 7, the soldering strength of the crystal oscillator 50 formed in the mode of the second embodiment to the mounting substrate is more than twice the strength of the conventional piezoelectric oscillator (Ave: about 60 Newtons). (N)) could be obtained. Moreover, also in peeling strength, the intensity | strength (Ave: about 45 Newton (N)) of just over 20% was able to be obtained.
As shown in FIG. 7, the effect of improving the soldering strength of the crystal oscillator 50 according to the second embodiment to the mounting substrate is obvious, and the same applies to the semiconductor device 10 according to the first embodiment having the same aspect. It can be inferred that an advantageous effect can be obtained.

(Modification of sealing part forming step)
Here, the modification of the sealing part formation step of embodiment mentioned above is demonstrated using FIGS. 8-10. 8A and 8B show a pressing die used in the sealing process of Modification Example 1. FIG. 8A is a front sectional view in which the upper die has a two-layer structure, and FIG. 8B has a two-layer structure in each of the upper die and the lower die. It is a front sectional view. FIG. 9 is a front sectional view showing a second modification of the sealing step. FIG. 10 is a diagram for explaining a sealing portion formed by the first modification and the second modification, in which (a) is a front sectional view showing a pressing state, (b)
) Is a front sectional view showing the correlation between the formed sealing portion and the mounting electrode portion.

<Modification 1>
The pressing mold used in the sealing process of Modification 1 will be described with reference to FIGS. 8A, 8B, and 10A. In addition, although this modification 1 illustrates and demonstrates the structure of the above-mentioned 1st Embodiment, it is applicable also to the structure of 2nd Embodiment.

As shown in FIGS. 8 (a) and 10 (a), the pressing mold of the first modification is different from the above-described embodiment in the configuration of the upper mold 27. The lower mold 25 has a configuration having a lead frame receiving portion 26 similar to that of the above-described embodiment.
The upper die 27 of the pressing die shown in the modified example 1 has a two-layer structure, and is provided on the side that contacts the surface of the base die 27a and the pad portion 12 (metal film 13) of the base die 27a. And a pad pressing portion 27b.
The base mold 27a is made of metal so that it does not deform even when pressed. The pad pressing portion 27b is an elastic member that deforms when pressed and returns to its original shape when the pressure is released, so-called flexible material such as silicone resin, heat resistant rubber, polyimide resin. It is desirable to be formed of fluorine resin or the like. A tape-like elastic member made of these materials, for example, a polyimide tape or the like can also be used.

When forming the sealing portion (mold resin 16M) using the pressing die of the first modification, the pad portion 12 (metal film 1) of the mounting electrode portion 11 is formed prior to the step of forming the mold resin 16M.
3) With the surface of 3) as the pressing mold, pressure is applied by the pad pressing portion 27b constituting the upper mold 27 (FIG. 10 (
Cover while applying the direction of arrow P) shown in a).
At this time, since the pad pressing portion 27b is formed of an elastic member, the surface of the pad portion 12 (metal film 13) is in a state of biting into the pad pressing portion 27b. Thereafter, the resin is injected to form the mold resin 16M. In other words, the resin is injected in a state where the surface of the pad portion 12 (metal film 13) bites into the pad pressing portion 27b as a pressing mold.
M is formed.
Further, as shown in FIG. 8B, the lower mold 25 also has a two-layer structure composed of a base mold 25a and a mold 25b made of an elastic member provided on the side in contact with the semiconductor element. Good.
Alternatively, if the elastic member has a certain degree of rigidity, the base molds 27a and 25a are not necessary, and the pressing mold can be formed only by the molds 27b and 25b formed from the elastic member.

<Modification 2>
A pressing mold used in the sealing step of Modification 2 will be described with reference to FIG. In addition, this modification 2
The configuration of the first embodiment will be described by way of example in the same manner as in the first modification. However, the configuration of the second embodiment can also be applied.

As shown in FIG. 9, the pressing die according to the second modification has a configuration including an upper die 27 and a lower die 25 having a lead frame receiving portion 26 similar to those in the first embodiment.
In the second modification, prior to injecting the resin, the surface of the pad portion 12 (metal film 13) is
Covered with polyimide tape 28 as a tape-like elastic member. An adhesive material (not shown) is attached to the polyimide tape 28 on the side in contact with the surface of the pad portion 12 (metal film 13), and the polyimide tape 28 is attached to the pad portion 12 (metal film 13) by this adhesive material. Affixed to the surface.

The polyimide tape 28 may not be provided with an adhesive material. When the polyimide tape 28 without the adhesive material is used, the polyimide tape 28 is attached to the pad portion 12 (metal film) before the pad portion 12 (metal film 13) is sandwiched between the upper die 27 and the lower die 25. It may be placed so as to cover the surface of 13).
Moreover, although the polyimide tape 28 was demonstrated to the example as an elastic member in the above, it is not restricted to this,
For example, a silicone resin tape, a heat resistant rubber sheet, a fluorine resin sheet, or the like may be used.

When the sealing portion (mold resin 16M) is formed using the configuration of the second modification, the pad portion 12 (metal film 13) is formed with polyimide tape 28 as an elastic member prior to the step of forming the mold resin 16M. ) Cover the surface. Thereafter, the lead frame is pressurized by the upper die 27 and the lower die 25 as pressing dies. At this time, since the polyimide tape 28 is present on the surface of the pad portion 12 (metal film 13), the surface of the pad portion 12 (metal film 13) is in a state of biting into the polyimide tape 28 pressed by the upper mold 27.

Thereafter, the resin is injected to form the mold resin 16M. In other words, the pad portion 12 (
Resin is injected with the surface of the metal film 13) biting into the polyimide tape 28 to form a mold resin 16M.

According to the first and second modifications, the resin injected to form the mold resin 16M is not injected into the recess 17 and more reliably flows into the surface of the pad portion 12 (metal film 13). Can be prevented.
Further, since the mold resin 16M is formed with the pad portion 12 (metal film 13) biting into the pad pressing portion 27b or the polyimide tape 28 covering the surface of the pad portion 12 (metal film 13), FIG. ), A step d can be generated between the surface of the pad portion 12 (metal film 13) and the surface 16a of the mold resin 16M. This step d is
The pad portion 12 (metal film 13) can be provided with a so-called standoff function,
The solderability can be further improved.
As a result, even if there is some unevenness on the surface of the mold resin, the pad part protrudes from the surface of the mold resin due to the standoff function, so soldering to the mounting board of the electronic device is more reliable and stable. Can be performed.

(Application examples of recesses)
An application example of the recesses 17 and 57 formed in the mounting electrode portions 11 and 51 described in the above embodiment will be described with reference to FIG. FIG. 11 shows the recess 1 formed in the mounting electrode portions 11 and 51.
7 is a plan view showing an application example of FIG.

11 is a configuration in which three concave portions 17a, 17b, and 17c having a step from the surface of the pad portion 12 of the mounting electrode portion 11 are provided side by side in the cutting direction in the cutting singulation step. It is. In the cutting singulation step, a lead frame and a mold resin (including a pad portion 12 and the like) across the center of each of the three recesses 17a, 17b, and 17c (
(Not shown in the figure).
In addition, although the example provided with the three recessed parts 17a, 17b, and 17c was demonstrated in this example, the number of the provided recessed parts is not limited and how many may be sufficient.

By providing a plurality of recesses as in this application example, the surface area is increased and the solderability can be further improved.

(Lead frame modification)
Next, modified examples of the lead frame will be described with reference to FIGS. FIG. 12 is a plan view illustrating an example of mounting electrode connection leads that connect between the mounting electrode portions of Modification 3. FIG. 13 illustrates an example of mounting electrode connection leads that connect between the mounting electrode portions of Modification 4. FIG. In addition, about the structure similar to the above-mentioned embodiment, the same code | symbol may be attached | subjected and description may be abbreviate | omitted.

<Modification 3>
In the third modification, when the semiconductor device 10 as the electronic device described in the above-described embodiment is singulated, a plurality of mounting electrode portions 11 configured in one semiconductor device 10 are connected in the Y direction in the drawing. The mounting electrode connection lead 29a is provided on the lead frame 20. In addition, in this modification 3, it demonstrates with the two mounting electrode parts 11a and 11b.

As shown in FIG. 12, the mounting electrode portion 11a and the mounting electrode portion 11b provided on the lead frame 20 are connected by the mounting electrode connection lead 29a in the Y direction in the drawing. The Y direction shown in the figure indicates the direction of cutting across the central portion of the recess 17 in the cutting singulation step.
The mounting electrode connection lead 29a is once extended in the Y direction from the side of the mounting electrode 11b facing the mounting electrode portion 11a, then extended in the X direction, which is a direction orthogonal to the Y direction, and extended in the Y direction again. It is connected to the mounting electrode part 11a. Note that the mounting electrode connection lead 29 a is formed to have the same thickness as the recess 17.

If the lead frame 20 having the mounting electrode connection lead 29a as in the third modification is used, the plurality of mounting electrode portions 11a and 11b provided in the Y direction in the figure are connected, so that the rigidity of the lead frame 20 in the Y direction is increased. Can be increased.
Further, in the cutting singulation step, when cutting across the central portion of the recess 17, the mounting electrode connection lead 29 a having a narrow width is cut, so that the influence on clogging of the diamond wheel used for cutting is suppressed. It becomes possible.

<Modification 4>
In the fourth modification, when the semiconductor device 10 as the electronic device described in the above-described embodiment is singulated, a plurality of mounting electrode portions 11 configured in one semiconductor device 10 are connected in the Y direction in the drawing. The mounting electrode connection lead 29b is provided on the lead frame 20. In addition, in this modification 4, it demonstrates with the two mounting electrode parts 11a and 11b.

As shown in FIG. 13, the mounting electrode portion 11a and the mounting electrode portion 11b provided on the lead frame 20 are connected by the mounting electrode connection lead 29b in the Y direction in the drawing. The Y direction shown in the figure indicates the direction of cutting across the central portion of the recess 17 in the cutting singulation step.
The mounting electrode connection lead 29b extends linearly in the Y direction from the side where the mounting electrode portions 11a and 11b face each other.
Further, it is desirable that the mounting electrode connection lead 29b is formed to have the same thickness as that of the concave portion 17, and its width is smaller than a cutting allowance at the time of subsequent cutting. In other words, it is desirable that the width of the mounting electrode connection lead 29b be smaller than the width of the diamond wheel used for cutting.

If the lead frame 20 having the mounting electrode connection lead 29b as in the fourth modification is used, a plurality of mounting electrode portions 11a and 11b provided in the Y direction shown in the figure are connected, so that the rigidity of the lead frame 20 in the Y direction is increased. Can be increased.
Further, in the cutting singulation step, when cutting across the central portion of the recess 17, the width of the mounting electrode connection lead 29 b is smaller than the cutting allowance at the time of subsequent cutting. Since all of them are cut off, the mounting electrode connection lead 29b is not exposed to the sealing portion, and it becomes possible to enhance prevention of moisture intrusion.

(Electronics)
The electronic device or the piezoelectric device of each embodiment described above can be applied to various electronic apparatuses, and the obtained electronic apparatus has high reliability.
14 and 15 show a mobile phone as an example of an electronic apparatus according to the present invention.
FIG. 14 is a perspective view showing an outline of the appearance of a mobile phone, and FIG. 15 is a circuit block diagram for explaining a circuit portion of the mobile phone.

The mobile phone 300 can use the electronic device or the piezoelectric device described above. In this example, an example using a piezoelectric device will be described. Further, the configuration and operation of the piezoelectric device will be omitted by using the same reference numerals.
As shown in FIG. 14, the mobile phone 300 includes an LCD (Liquid Cry) as a display unit.
(Stal Display) 301, a key 302 as an input unit for numbers, a microphone 303, a speaker 311, a circuit unit (not shown), and the like. A part of these constituent members, a circuit portion, and the like are connected to a mounting substrate on which a circuit wiring pattern is formed by using, for example, soldering.
As shown in FIG. 15, when transmitting by the mobile phone 300, when the user inputs his / her voice to the microphone 303, the signal is transmitted to the pulse width modulation / coding block 304 and the modulator /
The transmitter 306 and the antenna switch 307 are transmitted from the start antenna 308 via the demodulator block 305.

On the other hand, a signal transmitted from another telephone is received by the antenna 308, and is input from the receiver 310 to the modulator / demodulator block 305 through the antenna switch 307 and the reception filter + amplifier 309. The modulated or demodulated signal is output as a voice to the speaker 311 via the pulse width modulation / coding block 304.
Among these, a controller 312 for controlling the antenna switch 307, the modulator / demodulator block 305, and the like is provided.
In addition to the above, the controller 312 controls the LCD 301 which is a display unit, the key 302 which is an input unit for numbers and the like, and further the RAM 313, the ROM 314 and the like. There is also a demand for miniaturization of the mobile phone 300.
The piezoelectric device described above is used to meet such requirements.
The mobile phone 300 includes a temperature-compensated crystal oscillator 315, a receiver synthesizer 316, a transmitter synthesizer 317, and the like as other constituent blocks, but a description thereof is omitted.

Since the piezoelectric device used in the cellular phone 300 has a metal film provided in advance on the side surface of the mounting electrode portion, a solder fillet is easily formed when mounted on a circuit board by soldering. In addition, the soldering strength can be improved and the connection reliability can be improved.
Therefore, the electronic device (mobile phone 300) using the piezoelectric device has stable connection reliability and can improve impact resistance.

As an electronic apparatus including the electronic device or the piezoelectric device according to the present invention, a personal computer (mobile personal computer) 400 shown in FIG. The personal computer 400 includes a display unit 401, an input key unit 402, and the like, and the above-described piezoelectric device is used as an electronic device for electrical control thereof or a reference clock.
In addition to the above, the electronic apparatus including the electronic device or the piezoelectric device of the present invention includes, for example, a digital still camera, an ink jet ejection device (for example, an ink jet printer), a laptop personal computer, a television, a video camera, and a video tape recorder. , Car navigation devices, pagers, electronic notebooks (including those with communication functions), electronic dictionaries, calculators, electronic game devices, word processors, workstations,
TV phone, crime prevention TV monitor, electronic binoculars, POS terminal, medical equipment (eg, electronic thermometer, blood pressure monitor, blood glucose meter, electrocardiogram measuring device, ultrasonic diagnostic device, electronic endoscope), fish finder,
Examples include various measuring devices, instruments (for example, vehicles, aircraft, and ship instruments), flight simulators, and the like.

As mentioned above, although the electronic device of the present invention has been described based on the illustrated embodiment, the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. be able to.

DESCRIPTION OF SYMBOLS 10 ... Semiconductor device as an electronic device 11, 51 ... Mounting electrode part, 12, 52 ... Pad part, 13, 53 ... Metal film, 14 ... Semiconductor element as electronic component, 15 ... Metal bump, 1
6, 56 ... Sealing part, 16M, 56M ... Mold resin, 17, 57 ... Recess, 18, 58 ... Step part, 19, 59 ... Joint lead, 20, 70 ... Lead frame, 21 ... Sealing part forming lead frame , 22ax: longitudinal first cutting portion, 22bx: longitudinal second cutting portion, 22ay ... lateral first cutting portion, 22by ... lateral second cutting portion, 23 ... diamond wheel, 25, 75 ...
Lower die, 25a ... Base die, 25b ... Mold made of elastic member, 26,76 ... Lead frame receiving portion, 27,77 ... Upper die as pressing die, 27a ... Base die, 27b ... Pad holding portion, 28 ... polyimide tape as elastic member, 50 ... crystal oscillator as piezoelectric device,
54 ... Semiconductor element as a circuit element, 55 ... Bonding wire, 60 ... Crystal oscillator,
61 ... Package, 62 ... Package side wall, 63 ... Crystal vibrating piece, 64 ... Conductive adhesive, 6
5 ... Lid, 66 ... Back side of package as one surface of crystal resonator, 300 ... Mobile phone as electronic device, 400 ... Personal computer as electronic device.

Claims (7)

A pad portion; a mounting electrode portion provided with at least one of a recess and a through hole surrounded by the pad portion in plan view; and the mounting facing at least one region of the recess and the through hole. Preparing a lead frame having a metal film disposed on the surface of the electrode portion;
Connecting an electronic component to the lead frame;
Covering the pad portion and the metal film with a mold;
Forming a sealing part so as not to cover the pad part and the metal film, and to cover at least a part of the mounting electrode part and at least a part of the electronic component;
Cutting the pad portion, the mounting electrode portion, and the sealing portion. An electronic device manufacturing method comprising: In the manufacturing method of the electronic device of Claim 1,
The step of covering the pad part and the metal film with a mold includes the step of pressing the mold against at least one of the pad part and the metal film, while the mold is an elastic member. Device manufacturing method. In the manufacturing method of the electronic device of Claim 1 or 2 ,
At least one of the said recessed part and the said through hole is formed by an etching process, The manufacturing method of the electronic device characterized by the above-mentioned. Pad portion is disposed on the one mounting electrode portion that only have a recess that is open of the pad portion in a region adjacent to the pad portion, and a surface of the mounting electrode portion facing the recess in plan view A lead frame having a metal film,
An electronic component electrically connected to the mounting electrode portion;
An electronic device comprising: a sealing portion that does not cover the entire pad portion and the metal film, and covers at least a portion of the mounting electrode portion and at least a portion of the electronic component. The electronic device according to claim 4 .
The recess, electronic devices with multiple parallel Dei wherein Rukoto the mounting electrode portion in a plan view. The electronic device according to claim 4 or 5 ,
An electronic device comprising: a vibrator; and a circuit element having at least a function of causing the vibrator to oscillate. An electronic apparatus using the electronic device according to claim 4 or 5 .

Images