CN212648235U - Lead frame and related signal transmission plate - Google Patents
Lead frame and related signal transmission plate Download PDFInfo
- Publication number
- CN212648235U CN212648235U CN202020733659.9U CN202020733659U CN212648235U CN 212648235 U CN212648235 U CN 212648235U CN 202020733659 U CN202020733659 U CN 202020733659U CN 212648235 U CN212648235 U CN 212648235U
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- lead frame
- outer frame
- chip
- signal transfer
- plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/06—Structure, shape, material or disposition of the bonding areas prior to the connecting process of a plurality of bonding areas
- H01L2224/0601—Structure
- H01L2224/0603—Bonding areas having different sizes, e.g. different heights or widths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/34—Strap connectors, e.g. copper straps for grounding power devices; Manufacturing methods related thereto
- H01L2224/39—Structure, shape, material or disposition of the strap connectors after the connecting process
- H01L2224/40—Structure, shape, material or disposition of the strap connectors after the connecting process of an individual strap connector
- H01L2224/401—Disposition
- H01L2224/40151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/40221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/40245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
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- Lead Frames For Integrated Circuits (AREA)
Abstract
The utility model provides a lead frame and relevant signal transmission board for the holding chip, the lead frame includes the slot part, certainly the slot part along the first direction extension plane portion, through support piece with the outer frame portion that the slot part is connected, wherein the slot part is used for holding semiconductor chip, plane portion including be used for with the fixed hole of packaging part, outer frame portion encircle the slot part with plane portion. The lead frame further includes a lead portion extending from the outer frame portion to the slot portion along the first direction, the lead portion includes a first extension portion located on a first position surface, a second extension portion located on a second position surface, and a turning portion connected between the first extension portion and the second extension portion, wherein the second extension portion is connected with the outer frame portion. The lead frame provided by the application can avoid the risks of damage and breakage to the packaging piece caused by external force generated when the pin part is additionally bent after punching operation.
Description
Technical Field
The present disclosure relates to the field of semiconductor packaging, and more particularly, to a lead frame for accommodating a chip and a related signal transmission board.
Background
In the prior art, when a semiconductor chip is packaged, the chip is first bonded to a lead frame having a plurality of pins by solder, then the leads are connected to the chip and the pins by solder, and then the package is sealed and the lead frame is punched. The punched lead frame additionally bends a plurality of pins to complete the semiconductor packaging chip. However, when the pins are bent, additional external force is easily applied to the package, which may cause the package to be broken or the solder to be deformed and broken due to the external force, thereby reducing the yield of the process. Moreover, when the chip and the pin are connected by the wire, the wire has a small width and a high impedance, which results in a decrease in the strength of the signal transmitted on the wire; in addition, when the chip and the pin are connected by the wire, the arc height of the wire will make the package body have to be heightened because the wire is not rigid. This leads to an increase in the manufacturing cost of the package.
SUMMERY OF THE UTILITY MODEL
An objective of the present invention is to provide a lead frame for accommodating a chip and a related signal transmission board, such as a problem of breaking a package body caused by bending a plurality of pins of the punched lead frame, and a problem of reducing signal strength and high manufacturing cost of the package body when connecting the chip and the pins with wires.
According to an embodiment of the present application, a leadframe for accommodating a chip is disclosed, including a groove portion, a planar portion extending from the groove portion along a first direction, and an outer frame portion connected to the groove portion through a support, wherein the groove portion is used for accommodating a semiconductor chip, the planar portion includes a hole for fixing with a package, and the outer frame portion surrounds the groove portion and the planar portion. The lead frame further includes a lead portion extending from the outer frame portion to the slot portion along the first direction, the lead portion includes a first extending portion located on a first position surface, a second extending portion located on a second position surface, and a turning portion connected between the first extending portion and the second extending portion, wherein the first position surface is higher than the second position surface, and the second extending portion is connected with the outer frame portion.
According to an embodiment of the present application, a leadframe for accommodating a chip is disclosed, including a groove portion, a planar portion extending from the groove portion along a first direction, and an outer frame portion connected to the groove portion through a support, wherein the groove portion is used for accommodating a semiconductor chip, the planar portion includes a hole for fixing with a package, and the outer frame portion surrounds the groove portion, the planar portion and the pin portion. The lead frame further includes a pin portion extending from the slot portion along a second direction opposite to the first direction, the pin portion includes a first extension portion located on a first bit plane, a second extension portion located on a second bit plane, and a turning portion connected between the first extension portion and the second extension portion, wherein the first bit plane is higher than the second bit plane, and the first extension portion is connected with the slot portion.
The lead frame disclosed by the application bends the pins before punching, so that the risk that the pins are bent after the chip is packaged and further the package body is damaged can be avoided.
According to an embodiment of the present application, a signal transmission plate is disclosed, which is integrally formed and includes a first connection portion, a second connection portion and a turning portion. The first connecting part extends on the first position surface and is used for connecting a chip in the lead frame; the second connecting part extends on the second position surface and is used for connecting pins of the lead frame; the turning part is connected between the first connecting part and the second connecting part; wherein the second bit plane is higher than the first bit plane, and the signal transfer board is used for transferring signals between the chip and the pins.
According to an embodiment of the present application, a signal transmission plate is disclosed, which is integrally formed and includes a first connection portion, a second connection portion and a turning portion. The first connecting part extends on the first position surface and is used for connecting a chip in the lead frame; the second connecting part extends on the first position surface and is used for connecting pins of the lead frame; the turning part is connected between the first connecting part and the second connecting part; wherein the signal transfer board is used for transferring signals between the chip and the pins.
The signal transmission plate disclosed by the application is an integrated plate, and the signal transmission plate is integrally connected between the chip and the pins, and has a larger width than a single wire, so that the impedance encountered by the transmission of signals between the chip and the pins is lower. In addition, because the signal plate is used for connecting the chip and the pins, the arc height after the connection is effectively reduced, and the height of the packaging body is further reduced, thereby reducing the manufacturing cost of the packaging body.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not to limit the application. In the drawings:
fig. 1 is a diagram illustrating a lead frame according to an embodiment of the present application.
Fig. 2A is a schematic view of a pipe foot according to an embodiment of the present application.
FIG. 2B is a schematic view of a tube leg according to another embodiment of the present application.
FIG. 2C is a schematic view of a tube leg according to another embodiment of the present application.
Fig. 3 is a side view of a leadframe structure according to an embodiment of the present application.
FIG. 4 is a diagram illustrating a lead frame according to another embodiment of the present application.
Fig. 5 is a side view of a leadframe structure according to another embodiment of the present application.
FIG. 6 is a diagram illustrating a lead frame according to another embodiment of the present application.
Fig. 7 is a side view of a leadframe structure according to another embodiment of the present application.
FIG. 8 is a diagram illustrating a lead frame according to another embodiment of the present application.
Fig. 9 is a side view of a leadframe structure according to another embodiment of the present application.
FIG. 10 is a schematic view of a leg portion according to another embodiment of the present application.
Fig. 11 is a schematic diagram of a signal transmission plate according to an embodiment of the present application.
Fig. 12 is a schematic view of a signal transmission board in combination with a lead frame according to an embodiment of the present application.
Fig. 13 is a schematic diagram of a signal transmission plate according to another embodiment of the present application.
Fig. 14 is a schematic view of a signal transmission board in combination with a lead frame according to another embodiment of the present application.
Fig. 15A to 15E are flowcharts illustrating steps of a chip packaging method according to an embodiment of the present application.
Detailed Description
The following disclosure provides various embodiments or illustrations that can be used to implement various features of the disclosure. The embodiments of components and arrangements described below serve to simplify the present disclosure. It is to be understood that such descriptions are merely illustrative and are not intended to limit the present disclosure. For example, in the description that follows, forming a first feature on or over a second feature may include certain embodiments in which the first and second features are in direct contact with each other; and may also include embodiments in which additional elements are formed between the first and second features described above, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or characters in the various embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Moreover, spatially relative terms, such as "under," "below," "over," "above," and the like, may be used herein to facilitate describing a relationship between one element or feature relative to another element or feature as illustrated in the figures. These spatially relative terms are intended to encompass a variety of different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Although numerical ranges and parameters setting forth the broad scope of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain standard deviations found in their respective testing measurements. As used herein, "about" generally refers to actual values within plus or minus 10%, 5%, 1%, or 0.5% of a particular value or range. Alternatively, the term "about" means that the actual value falls within the acceptable standard error of the mean, subject to consideration by those of ordinary skill in the art to which this application pertains. It is understood that all ranges, amounts, values and percentages used herein (e.g., to describe amounts of materials, length of time, temperature, operating conditions, quantitative ratios, and the like) are modified by the term "about" in addition to the experimental examples or unless otherwise expressly stated. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, these numerical parameters are to be understood as meaning the number of significant digits recited and the number resulting from applying ordinary carry notation. Herein, numerical ranges are expressed from one end to the other or between the two ends; unless otherwise indicated, all numerical ranges set forth herein are inclusive of the endpoints.
Fig. 1 is a schematic view of a lead frame 1 for accommodating a chip according to an embodiment of the present application. In the present embodiment, the lead frame 1 is designed to be integrally formed and used for the packaging operation of the semiconductor chip. In some embodiments, the lead frame 1 is made of a conductive material. Preferably, the lead frame 1 is made of copper. As shown in fig. 1, the lead frame 1 includes a groove 11, a flat portion 12, an outer frame 13, and a leg portion 14. The groove portion 11 includes a recess for accommodating a semiconductor chip. In some embodiments, the semiconductor chip is adhered to the groove of the slot 11 by solder, so that the groove can prevent the solder from irregularly spreading in addition to the function of accommodating the semiconductor chip, thereby preventing the solder from adhering to other parts of the lead frame 1. The planar portion 12 extends from the groove portion 11 along the first direction a, and the planar portion 12 includes a hole 121 for connection with a package. In detail, when the semiconductor chip is packaged, the package is fixed to the hole 121 by clamping. However, the fixing manner of the package and the hole 121 is not a limitation of the present application.
The outer frame 13 is connected to the groove 11 by supports 131 and 132, and surrounds the groove 11, the planar portion 12, and the leg portion 14. In the present embodiment, the outer frame portion 13 is used to support the groove portion 11 during the sealing operation, and after the sealing operation is completed, the outer frame portion 13 is separated from the groove portion 11 by punching. It should be noted that the outer frame 13 having a rectangular structure is convenient for mass production of the lead frame 1 in a factory, and can be arranged closely to each other for convenient operation. However, the shape of the outer frame portion 13 is not a limitation of the present application.
The leg portion 14 extends from the outer frame portion 13 in the first direction a toward the groove portion 11, and the leg portion 14 includes a plurality of legs. In detail, when the semiconductor chip is placed in the slot 11, a wire connection operation is performed to connect the output and input terminals of the semiconductor chip to the pins of the pin part 14, so that the signal of the semiconductor chip is transmitted through the pins.
Fig. 2A to 2C are examples of various structures of the leg portion 14. Referring to fig. 2A, the pin portion 14 includes a first extension portion 141, a second extension portion 142, and a turning portion 143. The first extension 141 is located at the first position P1 and is adjacent to the groove portion 11. The second extending portion 142 is located on a second position plane P2 and adjacent to the outer frame portion 13, wherein the first position plane P1 is higher than the second position plane P2. The turning part 143 is connected between the first extending part 141 and the second extending part 142. As shown in fig. 2A, the turning part 143 is a straight inclined surface, wherein an included angle θ 1 between the turning part 143 and the first position plane P1 is equal to an included angle θ 2 between the turning part 143 and the second position plane P2. In the present embodiment, the included angles θ 1 and θ 2 are between 30 degrees and 80 degrees. The actual angle depends on the design requirements. Note that the present application does not limit the turning portion 143 to a straight slope.
Referring to fig. 2B, in the embodiment of fig. 2B, the turning part 143 includes a turning angle, wherein an included angle θ 1 between the turning part 143 and the first position plane P1 is different from an included angle θ 2 between the turning part 143 and the second position plane P2. In the present embodiment, the included angle θ 1 is between 30 degrees and 80 degrees, and the included angle θ 2 is between 30 degrees and 80 degrees. Referring to fig. 2C, in the embodiment of fig. 2C, the turning part 143 includes two turning corners, wherein an included angle θ 1 between the turning part 143 and the first position plane P1 and an included angle θ 2 between the turning part 143 and the second position plane P2 are not limited to be equal or different. In the present embodiment, the included angle θ 1 is between 30 degrees and 80 degrees, and the included angle θ 2 is between 30 degrees and 80 degrees. The present application does not limit the detailed structure of the turning part 13.
Referring again to FIG. 1 in conjunction with FIG. 3, FIG. 3 is a side view as seen from the line B-B' in FIG. 1. In the embodiment of fig. 3, the structure shown in fig. 2A is used as an example of the pipe foot portion 14, however, it should be understood by those skilled in the art that the structure of fig. 2B or fig. 2C can be extended to the content of the embodiment of fig. 3. The second extending portion 142 of the leg portion 14 is connected to the outer frame portion 13, and the leg portion 14 extends from the outer frame portion 13 in the first direction a toward the groove portion 11. In the present embodiment, the groove 11 and the second extending portion 142 are coplanar with the second position plane P2. With this arrangement, the first extending portion 141 located at the first position P1 is higher than the groove portion 11 in the vertical direction.
In the embodiment of fig. 1, each leg of the leg portion 14 has a turn. In this way, after the outer frame portion 13 and the groove portion 11 are separated by performing the punching operation after the packaging operation is completed, the leg portion 14 does not need to be bent separately, whereby the risk of breakage or breakage of the package by an external force generated when the leg portion 14 is bent can be avoided, and the risk of breaking or deformation of the solder can also be avoided.
Fig. 4 is a schematic view of a lead frame 2 for accommodating a chip according to an embodiment of the present application. In the present embodiment, the lead frame 2 is designed to be integrally formed and is used for the packaging operation of the semiconductor chip. In some embodiments, the lead frame 2 is made of a conductive material. Preferably, the lead frame 2 is made of copper. As shown in fig. 4, the lead frame 2 includes a groove 21, a flat portion 22, an outer frame 23, and a leg 24. Lead frame 2 is similar to lead frame 1 in that slot portion 21 includes a recess for receiving a semiconductor chip. The planar portion 22 extends from the groove portion 21 along the first direction a, and the planar portion 22 includes a hole 221 for connection with a package. The outer frame portion 23 is connected to the groove portion 21 by the supports 231 and 232, and surrounds the groove portion 21, the planar portion 22, and the leg portion 24. In the present embodiment, the structure shown in fig. 2A to 2C can be used to realize the tube foot portion 24.
The embodiment shown in fig. 4 differs from that of fig. 1 only in that the outer frame portion 23 is not rectangular. In detail, the outer frame 23 of fig. 4 has the downward turning points H1 and H2, so that the portion of the outer frame 23 connecting the tube leg portion 24 is lower than the portion of the outer frame 13 connecting the tube leg portion 14 of fig. 1.
Referring also to fig. 4 in conjunction with fig. 5, fig. 5 is a side view as viewed along line B-B' of fig. 4. In the embodiment of fig. 5, the structure shown in fig. 2A is used as an example of the pipe foot 24, however, it should be understood by those skilled in the art that the structure of fig. 2B or fig. 2C can be extended to the content of the embodiment of fig. 5. The second extending portion 242 of the leg portion 24 is connected to the outer frame portion 23, and the leg portion 24 extends from the outer frame portion 23 in the first direction a toward the groove portion 21. Due to the relationship between the turns H1 and H2, the distance between the first extension 241 and the groove portion 21 in fig. 4 is smaller than the distance between the first extension 141 and the groove portion 11 in fig. 3. In the embodiment of fig. 5, the groove portion 21 and the first extension portion 241 are coplanar at the first position P1. However, this is not a limitation of the present application, and those skilled in the art can easily understand that the relative positions of the slot 21 and the pin 24 can be adjusted by adjusting the positions and lengths of the outer frame 23 at the turning points H1 and H2.
Fig. 6 is a schematic view of a lead frame 3 for accommodating a chip according to an embodiment of the present application. In the present embodiment, the lead frame 3 is designed to be integrally formed and is used for the packaging operation of the semiconductor chip. In some embodiments, the lead frame 3 is made of a conductive material. Preferably, the lead frame 3 is made of copper. As shown in fig. 6, the lead frame 3 includes a groove 31, a flat portion 32, an outer frame 33, and a leg portion 34. Lead frame 3 is similar to lead frame 1 in that slot portion 31 includes a recess for receiving a semiconductor chip. The planar portion 32 extends from the groove portion 31 along the first direction a, and the planar portion 32 includes a hole 321 for connection with a package. The outer frame 33 is connected to the groove 31 by supports 331 and 332, and surrounds the groove 31, the flat portion 32, and the leg portion 34. In the present embodiment, the structure shown in fig. 2A to 2C can be used to realize the tube foot portion 34.
The embodiment shown in fig. 6 differs from that shown in fig. 1 only in that the leg portion 34 extends from the slot portion 31 in the second direction a'. In detail, the pin portion 34 is connected to the groove portion 31 and is not connected to the outer frame portion 33.
Referring also to fig. 6 in conjunction with fig. 7, fig. 7 is a side view as viewed along line B-B' of fig. 6. In the embodiment of fig. 7, the structure shown in fig. 2A is used as an example of the pipe foot portion 34, however, it should be understood by those skilled in the art that the structure of fig. 2B or fig. 2C can be extended to the content of the embodiment of fig. 7. The first extending portion 341 of the leg portion 34 is connected to the groove portion 31, and the leg portion 34 extends from the groove portion 31 toward the outer frame portion 33 in the second direction a'. In the embodiment of fig. 7, the outer frame portion 33 is higher than the second extension portion 342 of the pin portion 34.
Fig. 8 is a schematic view of a lead frame 4 for accommodating a chip according to an embodiment of the present application. In the present embodiment, the lead frame 4 is designed to be integrally formed and is used for the packaging operation of the semiconductor chip. In some embodiments, the lead frame 4 is made of a conductive material. Preferably, the lead frame 4 is made of copper. As shown in fig. 8, the lead frame 4 includes a groove portion 41, a planar portion 42, an outer frame portion 43, and a leg portion 44. The lead frame 4 is similar to the lead frame 1, and the groove portion 41 includes a groove for receiving a semiconductor chip. The planar portion 42 extends from the groove portion 41 along the first direction a, and the planar portion 42 includes a hole 421 for connection with a package. The outer frame portion 43 is connected to the groove portion 41 via supports 431 and 432, and surrounds the groove portion 41, the planar portion 42, and the leg portion 44. In the present embodiment, the structure shown in fig. 2A to 2C may be used to realize the tube foot portion 44.
The embodiment shown in fig. 8 differs from that of fig. 6 only in that the outer frame portion 43 is not rectangular. In detail, the outer frame 43 has downward turning portions H3 and H4, so that the outer frame 43 and the leg portion 44 can be connected.
Referring also to fig. 8 in conjunction with fig. 9, fig. 9 is a side view as viewed along line B-B' of fig. 8. In the embodiment of fig. 9, the structure shown in fig. 2A is used as an example of the pipe foot portion 44, however, it should be understood by those skilled in the art that the structure of fig. 2B or fig. 2C can be extended to the content of the embodiment of fig. 9. The first extending portion 441 of the pin portion 44 is connected to the groove portion 41, and the pin portion 44 extends from the groove portion 41 toward the outer frame portion 43 in the second direction a'. In addition, since the outer frame 43 has the downward turning points H3 and H4, the second extending portion 442 is connected to the outer frame 43.
In the above embodiment, the pin portion has a first extending portion adjacent to the slot portion and a second extending portion adjacent to the outer frame portion, wherein the first extending portion located on the first position surface is higher than the second extending portion located on the second position surface. Therefore, if the outer frame portion has no corresponding design change, the pin portion will be connected to one of the slot portion or the outer frame portion, as in the embodiment of fig. 1 and 6. However, in other embodiments of the present application, the pin portion may have other structures.
FIG. 10 is a schematic view of a leg portion 54 according to an embodiment of the present application. As shown in fig. 10, the pin portion 54 has a first extending portion 541, a second extending portion 542, and a turning portion 543 connected between the first extending portion 541 and the second extending portion 542. Unlike the structure shown in fig. 2A to 2C, the first extension portion 541 and the second extension portion 542 are located on the same plane, so that the pin portion can still be connected to the slot portion and the outer frame portion without corresponding design changes of the outer frame portion, and each pin of the pin portion 54 has a turn. In this way, after the outer frame portion and the groove portion are separated by performing the punching operation after the packaging operation is completed, the leg portion 54 does not need to be bent separately, and the risk of damage and breakage of the package due to an external force generated when the leg portion 54 is bent can be avoided, and the risk of breaking and deformation of the solder can also be avoided.
It should be understood by those skilled in the art that, in the case where the first extension portion 541 and the second extension portion 542 are located on the same plane, the turning portion 543 can have other variations as well as those shown in the embodiments of fig. 2A to 2C. Other structural changes to the turning portion 543 are omitted for brevity.
As described above, when performing the packaging operation, the semiconductor chip is placed in the lead frame (such as the lead frame of the above embodiment); then, a wiring operation is performed to connect the output and input terminals of the semiconductor chip to the pins of the pin portion, so that the signals of the semiconductor chip are transmitted through the pins. However, when the chip and the pin are connected by the wire, the wire has a small width and a high impedance, which may cause the strength of the signal transmitted on the wire to be reduced; in addition, when the chip and the pin are connected by the wire, the arc height of the wire will make the package body have to be heightened because the wire is not rigid. The present application further provides a signal transfer board to solve the above-mentioned problems.
Fig. 11 is a schematic diagram of a signal transmission plate 60 according to an embodiment of the present application. In the present embodiment, the signal transfer plate 60 is an integrally molded design, and is for transferring signals between the semiconductor chip and the pins. In some embodiments, the signal transfer plate 60 is made of a conductive material. Preferably, the signal transfer plate 60 is made of copper. As shown in fig. 11, the signal transfer plate 60 includes a first connection portion 61, a second connection portion 62, and a turn portion 63 connected between the first connection portion 61 and the second connection portion 62. The first connection portion 61 extends on a first location P1' for connecting a semiconductor chip placed in a lead frame. The second connecting portion 62 extends on a second position P2' and is used for connecting the lead frame pins.
In the present embodiment, the first bit plane P1 'is lower than the second bit plane P2', so that the signal transmission board 60 can be packaged with the structure of the lead frame 1 in the embodiment of fig. 1. Referring to fig. 12, after the semiconductor chip IC1 is placed in the slot 11, and then the wiring operation is performed, the signal transmission plate 60 is connected between the semiconductor chip IC1 and the pin portion 14 to perform signal transmission. In detail, the first connection portion 61 is connected to the semiconductor chip IC1, and the second connection portion 62 is connected to the first extension portion 141.
The contact area of the signal transfer plate 60 and the chip surface is large compared to the prior art using a wire for signal transfer. In the embodiment, the impedance of the signal transmission plate 60 is lower than that of the used lead by 30-60%, so the conductivity is better; in addition, the arc height of the signal transmission plate 60 can be 20% to 50% lower than that of the wire, so that the thickness of the semiconductor chip package can be reduced, and the effects of cost saving, space saving and loss saving can be achieved. In addition, for the packaging equipment, because the wires need to be welded one by one, and the signal transmission plates can be installed in a group, the manufacturing efficiency is not as high as the speed of using the signal transmission plates.
It should be noted that in the embodiment of fig. 12, the turning part 63 is a flat inclined surface, which is connected between the first connecting part 61 and the second connecting part 62. However, as can be understood by those skilled in the art with reference to the embodiment of fig. 2A to 2C, the turning part 63 may have other structures. For example, for connecting the chip and the pin, the turn 63 may include at least one corner. The present application is not limited thereto. Other structural changes to the return 63 are omitted herein for brevity.
In the embodiment shown in fig. 12, the first connection portion 61 is located at a position with a first bit plane P1 'lower than the second connection portion 62 is located at a position with a second bit plane P2', so that the signal transmission board 60 can be packaged with the structure of the lead frame 1. However, it should be understood by those skilled in the art that the structure of the signal transmission board may be modified according to the structure of the lead frame.
Fig. 13 is a side view of a signal transfer plate 70 according to an embodiment of the present application. In the present embodiment, the signal transfer plate 70 is an integrally molded design, and is for transferring signals between the semiconductor chip and the pins. In some embodiments, the signal transfer plate 70 is made of a conductive material. Preferably, the signal transfer plate 70 is made of copper. As shown in fig. 13, the signal transfer plate 70 includes a first connection portion 71, a second connection portion 72, and a turn portion 73 connected between the first connection portion 71 and the second connection portion 72. The first connection portion 71 and the second connection portion 72 are located on the same plane, wherein the first connection portion 71 is used for connecting a semiconductor chip placed in a lead frame, and the second connection portion 72 is used for connecting pins of the lead frame.
In the present embodiment, the first connection portion 71 and the second connection portion 72 are coplanar with the plane P1 ″, so that the signal transmission board 70 can be packaged with the structure of the lead frame 3 in the embodiment of fig. 4 or 6. Referring to fig. 14, after the semiconductor chip IC2 is placed in the groove 31, the signal transmission plate 70 is connected between the semiconductor chip IC2 and the pin 34 for signal transmission, as shown in fig. 6. In detail, the first connection portion 71 is connected to the semiconductor chip IC2, and the second connection portion 72 is connected to the first extension portion 341.
Fig. 15A to 15E depict flow steps 81-85 of the chip packaging method. If substantially the same result is obtained, the present application is not limited to performing the steps completely in accordance with the flow of steps shown in FIGS. 15A-15E. The chip packaging method comprises the following steps:
And 83, connecting the semiconductor chip to the pin part positioned on a second position surface, wherein the first position surface is different from the second position surface. As shown in fig. 15C, a wiring operation is performed to connect the wiring 1504 between the semiconductor chip 1502 and the pin portion. In this embodiment, the connection line 1504 may be the signal transmission plate of the above-mentioned embodiment, which is adhered to the semiconductor chip 1502 and the pin portion by solder 1505.
At step 84, the package is secured to the leadframe to package the semiconductor chip. In the embodiment of fig. 15D, the encapsulant 1506 may include a phenolic-based resin (Novolac-based resin), an epoxy-based resin (epoxy-based resin), a silicone-based resin (silicone-based resin), or other suitable encapsulant. In other embodiments, the package 1506 may also include a suitable filler, such as powdered silicon dioxide. In addition, the package 1506 may package the semiconductor chip 1502 by different techniques, such as compression molding (compression molding), injection molding (injection molding), transfer molding (transfer molding), and the like, which are not limited in this application.
And step 85, performing punching operation to separate the groove part and the pin part from the outer frame part to obtain the semiconductor packaging chip. As shown in fig. 15E, after the punching operation, the semiconductor package chip can be obtained without performing the pin bending operation. Therefore, the risk of damage and breakage of the packaging part caused by external force generated when the pipe foot part is bent can be avoided, and the risk of breaking and deformation of the solder can also be avoided.
In summary, the lead frame provided by the present application has the pin portion bent in advance, so that the risk of damage and fracture to the package caused by external force generated when the pin portion is additionally bent after punching operation can be avoided; moreover, different lead frame structures are provided through different designs of the pin part and the outer frame part, and a user can select a proper lead frame structure to complete the packaging operation according to the design, the process and other factors; in addition, compared with the prior art of using wires for connection, the signal transmission plate provided by the application has lower impedance and lower arc height, so that the height of the package can be reduced, and the cost is further reduced.
Claims (18)
1. A lead frame is used for containing a chip and comprises a groove portion, a planar portion extending from the groove portion along a first direction and an outer frame portion connected with the groove portion through a support, wherein the groove portion is used for containing a semiconductor chip, the planar portion comprises a hole used for being fixed with a package, and the outer frame portion surrounds the groove portion and the planar portion.
2. The lead frame of claim 1, wherein the inflection portion is a straight slope.
3. The lead frame of claim 1, wherein the turn comprises at least one corner.
4. The lead frame according to claim 2 or 3, wherein an angle between the bent portion and the first plane is in a range from 30 degrees to 80 degrees, and an angle between the bent portion and the second plane is in a range from 30 degrees to 80 degrees.
5. The lead frame of claim 1, wherein the slot portion and the second extension portion are coplanar with the second bit plane.
6. The lead frame according to claim 1, wherein the slot portion and the first extension portion are coplanar with the first plane.
7. A lead frame is used for containing a chip and comprises a groove part, a plane part extending from the groove part along a first direction and an outer frame part connected with the groove part through a support piece, wherein the groove part is used for containing a semiconductor chip, the plane part comprises a hole used for being fixed with a package, and the outer frame part surrounds the groove part and the plane part.
8. The lead frame according to claim 7, wherein the bent portion is a straight slope.
9. The lead frame of claim 7, wherein the turn comprises at least one corner.
10. The lead frame according to claim 8 or 9, wherein an angle between the bent portion and the first plane is in a range from 30 degrees to 80 degrees, and an angle between the bent portion and the second plane is in a range from 30 degrees to 80 degrees.
11. The lead frame according to claim 7, wherein the second extension is connected to the outer frame portion.
12. A signal transfer plate, wherein the signal transfer plate is integrally formed, comprising:
the first connecting part extends on the first position surface and is used for connecting a chip in the lead frame;
the second connecting part extends on the second position surface and is used for connecting pins of the lead frame; and
the turning part is connected between the first connecting part and the second connecting part;
wherein the second bit plane is higher than the first bit plane, and the signal transfer board is used for transferring signals between the chip and the pins.
13. The signal transfer plate of claim 12, wherein the turn is a straight bevel.
14. The signal transfer plate of claim 12, wherein the turn comprises at least one corner.
15. The signal transfer board of claim 12, wherein the signal transfer board is made of copper.
16. A signal transfer plate, wherein the signal transfer plate is integrally formed, comprising:
the first connecting part extends on the first position surface and is used for connecting a chip in the lead frame;
the second connecting part extends on the first position surface and is used for connecting pins of the lead frame; and
the turning part is connected between the first connecting part and the second connecting part;
wherein the signal transfer board is used for transferring signals between the chip and the pins.
17. The signal transfer plate of claim 16, wherein the turn comprises at least one corner.
18. The signal transfer board of claim 16, wherein the signal transfer board is made of copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020733659.9U CN212648235U (en) | 2020-05-07 | 2020-05-07 | Lead frame and related signal transmission plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020733659.9U CN212648235U (en) | 2020-05-07 | 2020-05-07 | Lead frame and related signal transmission plate |
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| CN212648235U true CN212648235U (en) | 2021-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295510A (en) * | 2022-09-06 | 2022-11-04 | 日月新半导体(威海)有限公司 | Semiconductor discrete device package |
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2020
- 2020-05-07 CN CN202020733659.9U patent/CN212648235U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295510A (en) * | 2022-09-06 | 2022-11-04 | 日月新半导体(威海)有限公司 | Semiconductor discrete device package |
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Address after: 264205 No. 16-1, Hainan Road, North District, comprehensive bonded zone, Weihai Economic and Technological Development Zone, Shandong Province Patentee after: Riyuexin semiconductor (Weihai) Co.,Ltd. Address before: 264205 no.16-1 Hainan Road, export processing zone, Weihai Economic Development Zone, Shandong Province Patentee before: RIYUEGUANG SEMICONDUCTOR(WEIHAI) Co.,Ltd. |
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