CN201681886U - Sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure - Google Patents
Sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure Download PDFInfo
- Publication number
- CN201681886U CN201681886U CN2010201806192U CN201020180619U CN201681886U CN 201681886 U CN201681886 U CN 201681886U CN 2010201806192 U CN2010201806192 U CN 2010201806192U CN 201020180619 U CN201020180619 U CN 201020180619U CN 201681886 U CN201681886 U CN 201681886U
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- substrate
- dao
- pin
- pins
- lead frame
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- Expired - Lifetime
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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
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector 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
- H01L2224/32221—Disposition the layer connector 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
- H01L2224/32245—Disposition the layer connector 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
-
- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—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
- H01L2224/48221—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
- H01L2224/48245—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
- H01L2224/48247—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 connecting the wire to a bond pad of the item
-
- 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
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/73—Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/013—Alloys
- H01L2924/0132—Binary Alloys
- H01L2924/01322—Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
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- Lead Frames For Integrated Circuits (AREA)
Abstract
The utility model relates to a sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure, which comprises substrates (1) and pins (2). The substrates (1) are divided into two groups, one group is a first substrate (1.1) while the other group is a second substrate (1.2), the central area of the front surface of the first substrate (1.1) is sunken, the front surface of the second substrate (1.2) is formed into a multi-projection-shaped structure, a first metal layer (4) is arranged on front surfaces of the second substrate (1.2) and the pins (2), a second metal layer (5) is arranged on back surfaces of the first substrate (1.1), the second substrate (1.2) and the pins (2), packing-free plastic packaging materials (3) are embedded on the peripheries of the pins (2), areas among the pins (2) and the first substrate (1.1), an area between the first substrate (1.1) and the second substrate (1.2) and areas among the second substrate (1.2) and the pins (2), and sizes of the back surfaces of the substrates (1) and the pins (2) are smaller than those of the front surfaces of the substrates (1) and the pins (2), thereby forming the big end up substrates and pins. The sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure has the advantages that plastic packaging bodies and metal pins have high binding capacity.
Description
(1) technical field
The utility model relates to a kind of sinking and the base island exposed type lead frame structure of multi-convex point type.Belong to the semiconductor packaging field.
(2) background technology
Traditional lead frame structure mainly contains two kinds:
First kind:
After chemical etching and surface electrical coating are carried out in the front of employing metal substrate, stick the resistant to elevated temperatures glued membrane of one deck at the back side of metal substrate and form the leadframe carrier (as shown in Figure 2) that to carry out encapsulation process.
Second kind:
After chemical etching and surface electrical coating are carried out in the front of employing metal substrate, promptly finish the making (as shown in Figure 3) of lead frame.Back etched is then carried out at the back side of lead frame again in encapsulation process.
And the not enough point of two kinds of above-mentioned lead frames below in encapsulation process, having existed:
First kind:
1) but the lead frame of this kind must stick the glued membrane of one deck costliness high temperature resistance because of the back side.So directly increased high cost.
2) but also because the glued membrane of one deck high temperature resistance must be sticked in the back side of the lead frame of this kind, so the load technology in encapsulation process can only be used conduction or nonconducting resin technology, and the technology that can not adopt eutectic technology and slicken solder is fully carried out load, so selectable product category just has bigger limitation.
3) but again because the glued membrane of one deck high temperature resistance must be sticked in the back side of the lead frame of this kind, and in the ball bonding bonding technology in encapsulation process, because but the glued membrane of this high temperature resistance is a soft materials, so caused the instability of ball bonding bonding parameter, seriously influenced the quality of ball bonding and the stability of production reliability.
4) but again because the glued membrane of one deck high temperature resistance must be sticked in the back side of the lead frame of this kind, and the plastic package process process in encapsulation process, because the high pressure of plastic packaging relation is easy to cause between lead frame and the glued membrane and infiltrates plastic packaging material, be that the kenel of conduction has become insulation pin (as shown in Figure 4) on the contrary because of having infiltrated plastic packaging material and will formerly should belong to metal leg.
Second kind:
The lead frame structure of this kind has carried out etching partially technology in the metal substrate front, though can solve the problem of first kind of lead frame, but because only carried out the work that etches partially in the metal substrate front, and plastic packaging material only envelopes the height of half pin in the plastic packaging process, so the constraint ability of plastic-sealed body and metal leg has just diminished, when if the plastic-sealed body paster is not fine to pcb board, does over again again and heavily paste, with regard to the problem (as shown in Figure 5) that is easy to generate pin.
Especially the kind of plastic packaging material is to adopt when filler is arranged, because material is at the environment and the follow-up surface-pasted stress changing relation of production process, can cause metal and plastic packaging material to produce the crack of vertical-type, its characteristic is the high more then hard more crisp more crack that is easy to generate more of proportion of filler.
(3) summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of and reduces that packaging cost, selectable product category are wide, the big base island exposed type of sinking and the base island exposed type lead frame structure of multi-convex point of constraint ability of good stability, plastic-sealed body and the metal leg of the quality of ball bonding and production reliability.
The purpose of this utility model is achieved in that base island exposed type of a kind of sinking and the base island exposed type lead frame structure of multi-convex point, comprise Ji Dao and pin, described Ji Dao has two groups, one group is first Ji Dao, another group is second Ji Dao, front, described first basic island middle section sinks, multi-convex point shape structure is arranged in front, the second basic island, front at described second Ji Dao and pin is provided with the first metal layer, at described first Ji Dao, the back side of second Ji Dao and pin is provided with second metal level, in the pin periphery, zone between the pin and the first basic island, zone between first Ji Dao and the second basic island and the zone between second Ji Dao and the pin are equipped with packless plastic packaging material, described packless plastic packaging material links into an integrated entity Ji Dao and pin bottom, and make described Ji Dao and pin back side size less than Ji Dao and the positive size of pin, form up big and down small Ji Dao and pin configuration.
The beneficial effects of the utility model are:
1) but the glued membrane of one deck costliness high temperature resistance need not sticked in the back side of the lead frame of this kind.So directly reduced high cost.
2) but because the glued membrane of one deck high temperature resistance need not sticked in the back side of the lead frame of this kind yet, so the load technology in encapsulation process is except using conduction or nonconducting resin technology, can also adopt the technology of eutectic technology and slicken solder to carry out load, so selectable product category is just wide.
3) but again because the glued membrane of one deck high temperature resistance need not sticked in the back side of the lead frame of this kind, guaranteed the stability of ball bonding bonding parameter, guaranteed the quality of ball bonding and the stability of production reliability.
4) but again because the lead frame of this kind need not stick the glued membrane of one deck high temperature resistance, and the plastic package process process in encapsulation process can not cause between lead frame and the glued membrane fully and infiltrate plastic packaging material.
5) because the zone between described metal leg (pin) and metal leg is equipped with packless soft gap filler, this packless soft gap filler has the filler plastic packaging material to envelope the height of whole metal leg with the routine in the plastic packaging process, so the constraint ability of plastic-sealed body and metal leg just becomes big, do not have the problem that produces pin again.
6) owing to adopted positive method of separating the etching operation with the back side, so in the etching operation, can form the slightly little and big slightly structure of positive basic island size of the size of back side Ji Dao, and slided by the tighter more difficult generation that packless plastic packaging material coated and falling pin with the size that varies in size up and down of a Ji Dao.
7) the Metal Substrate island of multi-convex point can be distributed to the hot swelling heat stress and the cold conditions shrinkage stress on Metal Substrate island on each salient point, the different different stress deformations that produce of the coefficient of expansion between the Metal Substrate island that has directly reduced monoblock and the chip with shrinkage, and then cause reliability injury problem after the encapsulation.
(4) description of drawings
Fig. 1 is base island exposed type and the base island exposed type lead frame structure of multi-convex point schematic diagram for the utility model sinks.
Fig. 2 was for sticked the resistant to elevated temperatures glued membrane figure of one deck operation in the past at the back side of metal substrate.
Fig. 3 was for to adopt the front of metal substrate to carry out chemical etching and surface electrical coating flow diagram in the past.
Fig. 4 was for formed insulation pin schematic diagram in the past.
Fig. 5 pin figure for what formed in the past.
Reference numeral among the figure:
1.1, the second basic island 1.2,1, the first basic island, base island, pin 2, packless plastic packaging material 3, the first metal layer 4, second metal level 5.
(5) embodiment
Referring to Fig. 1, Fig. 1 is base island exposed type and the base island exposed type lead frame structure of multi-convex point schematic diagram for the utility model sinks.As seen from Figure 1, the utility model sink base island exposed type and the base island exposed type lead frame structure of multi-convex point, comprise basic island 1 and pin 2, described basic island 1 has two groups, one group is the first basic island 1.1, another group is the second basic island 1.2, the described first basic island 1.1 front middle sections sink, multi-convex point shape structure is arranged in 1.2 fronts, the second basic island, front at the described second basic island 1.2 and pin 2 is provided with the first metal layer 4, on the described first basic island 1.1, the back side of the second basic island 1.2 and pin 2 is provided with second metal level 5, in pin 2 peripheries, zone between the pin 2 and the first basic island 1.1, zone between the first basic island 1.1 and the second basic island 1.2 and the zone between the second basic island 1.2 and the pin 2 are equipped with packless plastic packaging material 3, described packless plastic packaging material 3 links into an integrated entity basic island 1 with pin 2 bottoms, and make described basic island 1 and pin 2 back side sizes less than basic island 1 and pin 2 positive sizes, form up big and down small Ji Dao and pin configuration.
Claims (1)
1. sink base island exposed type and the base island exposed type lead frame structure of multi-convex point, comprise Ji Dao (1) and pin (2), it is characterized in that: described Ji Dao (1) has two groups, one group is first Ji Dao (1.1), another group is second Ji Dao (1.2), described first Ji Dao (1.1) front middle section sinks, second Ji Dao (1.2) is arranged to multi-convex point shape structure in the front, front at described second Ji Dao (1.2) and pin (2) is provided with the first metal layer (4), at described first Ji Dao (1.1), the back side of second Ji Dao (1.2) and pin (2) is provided with second metal level (5), in pin (2) periphery, zone between pin (2) and first Ji Dao (1.1), zone between first Ji Dao (1.1) and second Ji Dao (1.2) and the zone between second Ji Dao (1.2) and the pin (2) are equipped with packless plastic packaging material (3), described packless plastic packaging material (3) links into an integrated entity Ji Dao (1) with pin (2) bottom, and make described Ji Dao (1) and pin (2) back side size less than Ji Dao (1) and the positive size of pin (2), form up big and down small Ji Dao and pin configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201806192U CN201681886U (en) | 2010-04-28 | 2010-04-28 | Sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201806192U CN201681886U (en) | 2010-04-28 | 2010-04-28 | Sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201681886U true CN201681886U (en) | 2010-12-22 |
Family
ID=43346922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201806192U Expired - Lifetime CN201681886U (en) | 2010-04-28 | 2010-04-28 | Sunken-substrate-exposed and multi-projection-substrate-exposed type lead frame structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201681886U (en) |
-
2010
- 2010-04-28 CN CN2010201806192U patent/CN201681886U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101222 Effective date of abandoning: 20110720 |