JP2010103577A - Semiconductor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface-mountable semiconductor device which can be easily manufactured and the whole of which can be made thinner. <P>SOLUTION: The semiconductor device includes: a semiconductor chip 1; a first conductor 2A on which the semiconductor chip 1 is mounted and which is electrically connected to the semiconductor chip 1; at least one or more second conductors 2B, 2C which are electrically connected to one or more electrodes of the semiconductor chip 1; and a resin package 3 in which the semiconductor chip 1, the first conductor 2A, and the second conductors 2B, 2C are sealed. The first conductor 2A and the second conductors 2B, 2C have thin parts relatively thin in thickness and thick parts 21A, 21B, 21C relatively thick in thickness respectively. Furthermore, the thick part 21A of the first conductor 2A and the thick parts 21B, 21C of the second conductors 2B, 2C are exposed from the bottom surface 3e of the resin package 3, and at least one of the end surfaces 20a' to 20c' of the first conductor 2A and at least one of the end surfaces 20d' of the second conductors 2B, 2C are exposed from different sides 3a to 3d of the resin package 3 respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin package type semiconductor device.

  As a specific example of a conventional semiconductor device, there is one proposed by the applicant of the present application as described in Japanese Patent Laid-Open No. 11-3495917, and its configuration is shown in FIG. The semiconductor device B shown in the figure includes a semiconductor chip 90, a pair of conductors 91A and 91B, and a resin package 92 that seals them. The conductor 91A supports the semiconductor chip 90, and the conductor 91A and an electrode (not shown) on the lower surface of the semiconductor chip 90 are electrically connected. An electrode (not shown) on the upper surface of the semiconductor chip 90 and the conductor 91B are electrically connected via a wire W. The pair of conductors 91A and 91B is made of, for example, a metal plate having a certain thickness, and a part thereof is bent, whereby a pair of falling edges extending from the inside of the resin package 92 toward the bottom surface 92e. It has the part 93 and a pair of horizontal part 94 connected to those front-end | tips. Each horizontal portion 94 is exposed to the outside of the resin package 92 and overlaps the bottom surface 92e of the resin package 92.

  The semiconductor device B uses a manufacturing frame called a lead frame, that is, a frame in which a plurality of lead portions serving as a prototype of a pair of conductors 91A and 91B are formed by punching a metal plate. Can be manufactured. In this semiconductor device B, each horizontal portion 94 of the pair of conductors 91A, 91B is a surface mounting terminal portion, and this semiconductor device B can be surface mounted at a desired location using a solder reflow technique. it can. Since the pair of conductors 91A and 91B do not protrude outside the resin package 92 with a large size, the pair of conductors 91A and 91B is suitable for reducing the overall size of the semiconductor device B and increasing its mounting density. In a conventional traditional semiconductor device manufactured using a lead frame, for example, as shown in FIG. 11, a part of a pair of conductors 91C and 91D protrudes greatly outside the resin package 95, and the protruding portion The tip portion 96 is a surface mounting terminal portion. Compared with the semiconductor device having such a structure, the entire width of the semiconductor device B shown in FIG. 10 can be reduced, which is advantageous in increasing the mounting density.

  In the conventional semiconductor device B, the conductors 91A and 91B are bent as means for exposing a part of the conductors 91A and 91B to the outside of the resin package 92. Therefore, when manufacturing the conventional semiconductor device B using a manufacturing frame, it is necessary to bend each lead portion of the manufacturing frame. However, the manufacturing frame generally has a large number of lead parts so that a large number of semiconductor devices can be efficiently and collectively manufactured. It is difficult to perform the bending process as described above in a lump, and the work is complicated.

  Further, conventionally, since it is necessary to form the falling portions 93 on the conductors 91A and 91B, the heights of these conductors 91A and 91B are bulky by the height S of the falling portions 93. Become. Accordingly, the thickness of the entire semiconductor device has increased accordingly.

Japanese Patent Laid-Open No. 11-345919

  The present invention has been conceived under such circumstances, and it is an object of the present invention to provide a surface-mountable semiconductor device that is easy to manufacture and can be thinned as a whole. It is said.

  In order to solve the above problems, the present invention takes the following technical means.

  The semiconductor device provided by the present invention is electrically connected to a semiconductor chip, a first conductor on which the semiconductor chip is mounted and electrically connected to the semiconductor chip, and at least one electrode of the semiconductor chip. Including at least one or more connected second conductors and a resin package for sealing the semiconductor chip, the first conductor, and the second conductor, wherein the first conductor and the second conductor are relatively thick. Has a thin part and a relatively thick part, and the thick part of the first conductor and the thick part of the second conductor are exposed from the bottom surface of the resin package, At least one end surface of the first conductor and at least one end surface of the second conductor are respectively exposed from different side surfaces of the resin package.

  In a preferred embodiment, the thick portion of the first conductor has a convex portion protruding toward the bottom side of the resin package with respect to the thin portion of the first conductor, and the thick portion of the second conductor. Has protrusions protruding toward the bottom surface of the resin package with respect to the thin portion of the second conductor, and these protrusions are exposed from the bottom surface of the resin package.

  In a preferred embodiment, each of the convex portions is surrounded by the resin of the resin package.

  In a preferred embodiment, an end surface of the thin portion of the second conductor is exposed from a side surface of the resin package that is located on the opposite side of the semiconductor chip with the second conductor interposed therebetween.

  In a preferred embodiment, the second conductor extends from the thick portion of the second conductor in a direction crossing a direction connecting the thick portion of the second conductor and an end surface of the thin portion of the second conductor. It has the 2nd thin part which protrudes.

  In a preferred embodiment, the second thin portion is inherent in the resin package.

  In a preferred embodiment, the end surface of the thin portion of the first conductor is exposed from three adjacent side surfaces of the resin package.

  In a preferred embodiment, the end surface of the first conductor has a retracting portion that retracts inward from the side surface of the resin package.

  In a preferred embodiment, the plurality of electrodes of the semiconductor chip and the second conductor are electrically connected by a wire, and the wire is connected to the thick portion of the second conductor. 9. The semiconductor device according to any one of 1 to 8.

  In a preferred embodiment, an electrode is formed on a surface of the semiconductor chip connected to the first conductor, and the electrode and the surface of the first conductor are directly connected.

  In a preferred embodiment, each end surface exposed from the side surface of the resin package is positioned at a height spaced from the bottom surface of the resin package.

  In a preferred embodiment, each end face exposed from the side surface of the resin package is flush with the side surface of the resin package.

  In a preferred embodiment, the number of the second conductors is at least two, and the end surfaces of the second conductors exposed at the side surfaces of the resin package are exposed at the same side surface of the resin package.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention.

It is sectional drawing which shows an example of the semiconductor device which concerns on this invention. FIG. 2 is a plan view of a state where a resin package of the semiconductor device shown in FIG. 1 is seen through. FIG. 3 is an explanatory plan view showing a thick part of a conductor of the semiconductor device shown in FIGS. 1 and 2. FIG. 3 is a bottom view of the semiconductor device shown in FIGS. 1 and 2. It is a principal part top view which shows an example of the flame | frame for manufacture for manufacturing the semiconductor device which concerns on this invention. FIG. 6 is a main part explanatory view showing a thick part and a thin part of the semiconductor device manufacturing frame shown in FIG. 5; It is a principal part top view which shows the manufacturing process of a semiconductor device. FIG. 5 is a cross-sectional view of a principal part showing a comparison with the semiconductor device shown in FIGS. 1 to 4. It is sectional drawing which shows the other example of the semiconductor device which concerns on this invention. It is sectional drawing which shows an example of a prior art. It is sectional drawing which shows the other example of a prior art.

  Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

  1 to 4 show an example of a semiconductor device according to the present invention. As shown well in FIGS. 1 and 2, the semiconductor device A of this embodiment includes a semiconductor chip 1, three conductors 2 </ b> A to 2 </ b> C, and a resin package 3.

  The semiconductor chip 1 has electrodes on the upper and lower surfaces thereof, and exhibits a desired function when a voltage is applied to the plurality of electrodes. Various semiconductor chips can be used in the present invention, and their specific functions and internal circuit configurations are not limited at all. The resin package 3 is made of, for example, epoxy resin, and has a rectangular parallelepiped shape that covers the semiconductor chip 1, the two wires W connected thereto, and the conductors 2 </ b> A to 2 </ b> C together.

  Each of the conductors 2A to 2C is made of a metal plate such as a copper plate, and these are formed by processing a semiconductor device manufacturing frame having a predetermined shape, as will be described later. The conductor 2A has the semiconductor chip 1 mounted on the upper surface thereof, and is electrically connected to an electrode (not shown) on the lower surface of the semiconductor chip 1. The conductors 2B and 2C are conductively connected to the two electrodes 10 on the upper surface of the semiconductor chip 1 through wires W. All of these conductors 2 </ b> A to 2 </ b> C are disposed near the bottom surface 3 e in the resin package 3. The conductors 2A to 2C have a flat upper surface, whereas the thicknesses of the conductors 2A to 2C are non-uniform so that a step is formed on the lower surface.

  More specifically, the conductor 2A has a plurality of end portions 20a to 20a extending from the peripheral portion of the mounting region of the semiconductor chip 1 toward the side surfaces 3a to 3c of the resin package 3 as shown in FIG. 20c. End surfaces 20a ′ to 20c ′ of these end portions 20a to 20c are substantially the same as the side surfaces 3a to 3c, respectively. A part of the conductor 2A excluding the end portions 20a to 20c is formed as two thick portions 21A having a rectangular shape. The other part of the conductor 2A is a thin part having a thickness smaller than each thick part 21A. Each of the conductors 2B and 2C has an end portion 20d extending from a peripheral portion of a portion to which one end of the wire W is bonded toward the side surface 3d of the resin package 3, and an end surface 20d ′ of the end portion 20d is The surface is substantially the same as the side surface 3d. A part of each of the conductors 2B and 2C excluding the end 20d is formed as a thick portion 21B and 21C having a rectangular shape. The other portions of the conductors 2B and 2C are thin portions having a thickness smaller than that of the thick portions 21B and 21C. The portions shown by cross hatching in FIG. 3 are portions corresponding to the thick portions 21A to 21C.

  As shown in FIG. 1, each of the thick portions 21 </ b> A to 21 </ b> C has a convex portion 22 that protrudes downward by an appropriate dimension Sa from the other portions (thin portions) of the conductors 2 </ b> A to 2 </ b> C. ing. The bottom surface 22a of each convex portion 22 is a portion corresponding to an example of a terminal portion for surface mounting as referred to in the present invention, is flush with or substantially flush with the bottom surface 3e of the resin package 3, and is external to the resin package 3. (See also FIG. 4). The entire periphery of each convex portion 22 is surrounded by the resin of the resin package 3, and the plurality of standing side surfaces 22 b of each convex portion 22 are in close contact with the resin of the resin package 3. Since the end portions 20a to 20d of the conductors 2A to 2C are all thin portions, the lower ends of the end surfaces 20a 'to 20d' are positioned above the bottom surface 3e of the resin package 3 by an appropriate height H. is doing.

  Next, a specific example of a semiconductor device manufacturing frame used for manufacturing the semiconductor device A and a method of manufacturing the semiconductor device A using the same will be described.

  FIG. 5 shows an example of a semiconductor device manufacturing frame. The illustrated frame 4 is made by punching and pressing a long strip or rectangular copper plate having a certain thickness into a predetermined shape, and etching the copper plate to make a predetermined portion thin, and each portion is a thin portion. And a thick part.

  More specifically, the frame 4 is provided with a predetermined shape of holes 40 and 41 connected in series in the left and right lateral directions of FIG. A plurality of pairs of lead portions 2B ′ and 2C ′ and a plurality of wide lead portions 2A ′ on which a semiconductor chip can be mounted are formed so as to be arranged in a plurality of vertical and horizontal rows. Each lead portion 2B ′, 2C ′ is a portion that becomes a prototype of the conductors 2B, 2C of the semiconductor device A, whereas each lead portion 2A ′ is a portion that becomes a prototype of the conductor 2A. 2B ′ and 2C ′ and the lead portions 2A ′ are alternately arranged in the vertical direction of the frame 4. The uppermost lead portions 2B ′ and 2C ′ formed by the hole portion 40 are connected to the upper edge portion 40a of the hole portion 40, while the other row lead portions formed by the hole portion 41 are connected. 2B ′ and 2C ′ are connected to the lead portion 2A ′. Of the multiple rows of lead portions 2A ', the lead portion 2A' (2A ") located in the lowermost row need not be formed by connecting the lead portions 2B 'and 2C'. The outer shape of '(2A ") is shaped by providing the frame 4 with two types of rectangular holes 42a and 42b.

  The back surface of the frame 4 is subjected to an etching process for making a predetermined portion of the frame 4 thin, and the frame 4 has a thick portion that is not etched, and a thin portion that is etched. Is provided. A portion indicated by cross hatching in FIG. 6 is a thick portion, and thick portions 21A to 21C are formed in the lead portions 2A ′ to 2C ′. The thickness of each thick part remains the original thickness of the frame 4. As a method for etching the frame 4, a general method in which a predetermined portion of the frame 4 is covered with a resist and then the frame 4 is immersed in an etching solution can be used.

  In order to manufacture the semiconductor device A, first, as shown in FIG. 7, a plurality of semiconductor chips 1 are mounted on each lead portion 2A ′ of the frame 4, and the electrodes of each semiconductor chip 1 and the lead portions 2B ′, 2C ′. Are connected using a wire W. Next, the entire frame 4 or substantially the entire frame 4 is resin-sealed using, for example, epoxy resin (not shown) so as to cover each semiconductor chip 1 and each wire W. This resin sealing work can be performed by transfer molding using a mold or by printing a desired resin on the frame 4. However, at the time of this resin sealing, the portion corresponding to each terminal portion of the conductors 2A to 2C of the semiconductor chip 1 (the portion corresponding to the bottom surface 22a of each convex portion 22) on the back surface of the frame 4 is covered with the resin. Don't break. After the resin sealing operation is completed, the sealing resin and the frame 4 are cut at the locations indicated by the virtual lines Na and Nb in FIG. As a result, a plurality of semiconductor devices A shown in FIGS. Each cut surface of the frame 4 becomes end surfaces 20a ′ to 20d ′ of the conductors 2A to 2C.

  As understood from the above manufacturing method, when manufacturing the semiconductor device A according to the present embodiment, it is not necessary to bend each of the plurality of lead portions 2A ′ to 2C ′ of the frame 4. Although the frame 4 needs to be subjected to an etching process for thinning a predetermined part, this process can be performed collectively on each part of the frame 4. Therefore, as compared with the conventional semiconductor device manufactured by bending a plurality of locations of the semiconductor device manufacturing frame, the manufacturing of the semiconductor device A of this embodiment is facilitated, and the manufacturing cost is reduced. Can do.

  Next, usage examples and operations of the semiconductor device A will be described.

  As shown in FIG. 1, the semiconductor device A can be surface-mounted on a desired substrate 5 using the bottom surface 22a of each convex portion 22 of the conductors 2A to 2C. More specifically, the semiconductor device A employs a solder reflow technique to electrically and mechanically connect the bottom surfaces 22a of the conductors 2A to 2C to the conductor pads 50 of the substrate 5 via the solder 60. Can be connected. Since each bottom surface 22a is flush with or substantially flush with the bottom surface 3e of the resin package 3, the bottom surface 3e of the resin package 3 is not significantly lifted from the surface of the substrate 5, so that the semiconductor device A is kept in a stable posture. It can be mounted on the substrate 5.

  When the semiconductor device A is mounted on the substrate 5, a part of the solder 60 may protrude from between each convex portion 22 and each conductor pad 50. On the other hand, in this semiconductor device A, the lower ends of the end faces 20a ′ to 20d ′ of the conductors 2A to 2C are positioned above the bottom face 3e of the resin package 3 by an appropriate height H, and therefore Thus, it is possible to reduce the possibility that the solder 60 that protrudes adheres to the end faces 20a ′ to 20d ′. For example, as shown in FIG. 8, the protrusion 22 of the conductor 2A extends to the side surface 3a of the resin package 3, so that the lower end of the end surface 20a ′ of the conductor 2A is at the same height as the bottom surface 3e of the resin package 3. Then, there is a high possibility that a part of the solder 60 adheres to the end face 20a ′. If the solder 60 adheres to the end face 20a ′, when the semiconductor device is brought close to another semiconductor device and surface-mounted on the substrate 5, a part of the solder 60 may come into contact with the other semiconductor device. It may not be preferable to increase the mounting density of the device. However, according to the semiconductor device A of the present embodiment, the possibility of the solder 60 adhering to the end faces 20a ′ to 20d ′ can be reduced, so that such a problem can be solved.

  In this semiconductor device A, the end portions 20a to 20d of the conductors 2A to 2C are thin portions, so that each of the end surfaces 20a 'to 20d' is disposed above the bottom surface 3e of the resin package 3. . Therefore, it is not necessary to incline the conductors 2A to 2C or to bend them as means for separating the end faces 20a ′ to 20d ′ above the bottom surface 3e of the resin package 3. Further, since the areas of the end faces 20a ′ to 20d ′ are reduced by the amount of the thin end portions 20a to 20d, the solder 60 is more difficult to adhere to the end faces 20a ′ to 20d ′.

  Of the conductors 2 </ b> A to 2 </ b> C, portions other than the convex portions 22 are thin portions, and the resin of the resin package 3 exists below the respective portions of the thin portions. Accordingly, the conductors 2A to 2C can be reliably and appropriately fixed in the resin package 3, and disconnection of the wire W caused by relative movement between the conductors 2A to 2C and the resin package 3 can be appropriately prevented. . In particular, since the entire periphery of the plurality of side surfaces 22b of each convex portion 22 is surrounded by the resin of the resin package 3, the fixing of the conductors 2A to 2C becomes more reliable. Further, in this semiconductor device A, since the conductors 2A to 2C are not subjected to bending processing, and the bottom surface 22a of each convex portion 22 is used as a surface mounting terminal portion, the surface is obtained by bending the conductor. Compared with the conventional one in which the terminal portion for mounting is formed, the entire height of the conductors 2A to 2C can be reduced by the amount that the conductors 2A to 2C are not bent. Therefore, the semiconductor device A can be thinned.

  The present invention is not limited to the above-described embodiment.

  In the above-described embodiment, a thick portion and a thin portion are formed in each of the conductors 2A to 2C, and these conductors have two types of thicknesses, but the present invention is not limited to this. In the present invention, for example, in addition to the thick portion and the thin portion, a portion having an intermediate thickness between the thick portion and the thin portion may be further provided. In short, since the thickness of the conductor is not uniform, it is only necessary that a convex portion protruding in the bottom direction of the resin package is formed on a part of the conductor.

  In the present invention, for example, as shown in FIG. 9, when no electrode is formed on the back surface of the semiconductor chip 1, a part of the conductor 2D on which the semiconductor chip 1 is mounted is exposed from the bottom surface 3e of the resin package 3. The conductors 2E and 2F that are electrically connected to the plurality of electrodes on the upper surface of the semiconductor chip 1 via the wires W are part of the protrusions 22, and part of the conductors 2E and 2F are part of the resin package 3. What is necessary is just to expose from the bottom face 3e. As described above, in the present invention, a conductor that is not conductive to the electrode of the semiconductor chip may be provided in the resin package, and it is not necessary to form the convex portion 22 for such a conductor. The number of conductors of the semiconductor device according to the present invention can be changed in various ways corresponding to the number of electrodes of the semiconductor chip, and the specific numerical values are not limited.

  In addition, the specific configuration of each part of the semiconductor device and the semiconductor device manufacturing frame according to the present invention can be varied in design in various ways. The specific material of the resin package and the frame is not particularly limited.

A Semiconductor device 1 Semiconductor chip 2 (2A to 2C) Conductor 3 Resin package 3a to 3d Side surface (resin package)
3e Bottom (resin package)
20a-20d end 20a'-20d 'end 22 convex part 22a bottom (convex part)

Claims (13)

A semiconductor chip;
A first conductor on which the semiconductor chip is mounted and electrically connected to the semiconductor chip;
At least one or more second conductors electrically connected to at least one or more electrodes of the semiconductor chip;
A resin package for sealing the semiconductor chip, the first conductor, and the second conductor;
The first conductor and the second conductor have a thin part having a relatively small thickness and a thick part having a relatively large thickness, and
The thick part of the first conductor and the thick part of the second conductor are exposed from the bottom surface of the resin package,
At least one end surface of the first conductor and at least one end surface of the second conductor are respectively exposed from different side surfaces of the resin package.   The thick portion of the first conductor has a convex portion protruding toward the bottom surface side of the resin package with respect to the thin portion of the first conductor, and the thick portion of the second conductor is the second conductor. 2. The semiconductor device according to claim 1, further comprising: a protruding portion protruding toward the bottom surface side of the resin package with respect to the thin-walled portion, and the protruding portion is exposed from the bottom surface of the resin package.   The semiconductor device according to claim 2, wherein each of the convex portions is surrounded by a resin of the resin package.   4. The end surface of the thin portion of the second conductor is exposed from a side surface of the resin package that is located on the opposite side of the semiconductor chip with the second conductor interposed therebetween. The semiconductor device according to item.   The second conductor protrudes from the thick portion of the second conductor in a direction intersecting the direction connecting the thick portion of the second conductor and the end surface of the thin portion of the second conductor. The semiconductor device according to claim 1, comprising a thin portion.   The semiconductor device according to claim 5, wherein the second thin portion is inherent in the resin package.   7. The semiconductor device according to claim 1, wherein an end surface of the thin portion of the first conductor is exposed from three adjacent side surfaces of the resin package.   The semiconductor device according to claim 1, wherein the end surface of the first conductor has a retracting portion that retracts inward from a side surface of the resin package.   The plurality of electrodes of the semiconductor chip and the second conductor are electrically connected by a wire, and the wire is connected to the thick part of the second conductor. 2. The semiconductor device according to claim 1.   10. The electrode according to claim 1, wherein an electrode is formed on a surface of the semiconductor chip connected to the first conductor, and the electrode and the surface of the first conductor are directly connected. The semiconductor device described.   11. The semiconductor device according to claim 1, wherein each end surface exposed from a side surface of the resin package is located at a height spaced from a bottom surface of the resin package.   12. The semiconductor device according to claim 1, wherein each end face exposed from a side surface of the resin package is flush with a side surface of the resin package.   The said 2nd conductor is at least 2 or more, The said end surface exposed to the side surface of the said resin package of these 2nd conductors is exposed to the same side surface of the said resin package. The semiconductor device described.

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