CN203242616U - No-lead leadframe bar for semiconductor packaging - Google Patents
No-lead leadframe bar for semiconductor packaging Download PDFInfo
- Publication number
- CN203242616U CN203242616U CN 201220703103 CN201220703103U CN203242616U CN 203242616 U CN203242616 U CN 203242616U CN 201220703103 CN201220703103 CN 201220703103 CN 201220703103 U CN201220703103 U CN 201220703103U CN 203242616 U CN203242616 U CN 203242616U
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- China
- Prior art keywords
- conductive wire
- strip
- steam vent
- wire frame
- semiconductor packaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- H01L2224/42—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
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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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
- H01L2224/42—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
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- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
Abstract
A no-lead leadframe bar for semiconductor packaging comprises a leadframe block having a plurality of leadframe units arranged in a matrix order; at least one frame area located on the periphery of the leadframe block; and a plurality of vent holes arranged inside the frame area for discharging superfluous gas located on the leadframe block during a glue sealing process in order to prevent glue-spilling phenomena.
Description
Technical field
The utility model relates to a kind of conductive wire frame strip of non-exterior pin semiconductor packaging construction, particularly relevant for a kind of conductive wire frame strip of avoiding packaging semi-finished product to cause the non-exterior pin semiconductor packaging construction of excessive glue situation generation because exhaust has some setbacks in the manufacture process of sealing is set.
Background technology
Now, semiconductor packaging structure is normally selected lead frame (leadframe) or the next support plate (carrier) as carries chips of base plate for packaging (substrate), wherein the packaging structure of common use lead frame for example is little external form packaging structure (small outline package, SOP), square flat packaging structure (quad flat package, QFP) or square flat outer-pin-free packaging structure (quad flat no-lead package, QFN) etc.
Please refer to shown in Figure 1A, 1B and the 1C, it discloses the manufacturing process schematic diagram of a kind of existing square flat outer-pin-free packaging structure (QFN).Shown in Figure 1A, at first prepare a conductive wire frame strip 11, it is to be formed through the etching operation by a metal plate.Described conductive wire frame strip 11 is attached on the glued membrane 100 of a carrying usefulness, and comprise chip bearing 111 and several contacts 112, described chip bearing 111 and described contact 112 consist of lead frame 110 frameworks of a square flat outer-pin-free type, and wherein said several contacts 112 are arranged around around the described chip bearing 111 with single group or many prescriptions formula.Then, as shown in Figure 1B, a chip 12 is fixed on the described chip bearing 111, and utilizes several wires 13 to carry out the routing operation, so that several connection pads on the described chip 12 are electrically connected to respectively on described several contacts 112.After the routing operation, shown in Fig. 1 C, carry out the sealing operation, and then form the packaging adhesive material 14 that described chip 12, wire 13 and described conductive wire frame strip 11 top surface side are protected in embedding, remove again at last glued membrane 100, expose a bottom surface of described conductive wire frame strip 11.So, can finish the manufacturing of a non-exterior pin semiconductor packaging construction 100, the bare lower surface of wherein said contact 112 can be as input/output terminal.
The meeting the primary system plan is a plurality of with the regularly arranged lead frame block of matrix usually for described conductive wire frame strip 11; again together by etching partially, arrange the operations such as chip, routing and sealing; by cutting operation each lead frame block is separated again at last, can make in a large number above-mentioned non-exterior pin semiconductor packaging construction thus.
The manufacturing process of above-mentioned non-exterior pin semiconductor packaging construction is when carrying out the sealing operation, must first conductive wire frame strip be fixed on the surface of a bed die, again the mold of a correspondence is combined with this bed die, then more uncured packaging adhesive material is injected in the die cavity of mold, make the top surface side of packaging adhesive material embedding chip, wire and conductive wire frame strip, after glue material to be packaged solidified, conductive wire frame strip just can break away from upper and lower mould, carries out next operation.Yet, this manufacturing process carries out phase Inter in above-mentioned sealing operation, through the bottom surface of the conductive wire frame strip of being everlasting the situation that packaging adhesive material overflows into occurs, and claims again the glue phenomenon of overflowing, cause the part contact surface of the bottom surface of conductive wire frame strip also to be subject to the excessive glue embedding of packaging adhesive material, form product defects.
Above-mentioned excessive glue phenomenon mainly is because gas is present in the film cave and can't discharges smoothly, local gas pressure so that the glued membrane 100 that above-mentioned conductive wire frame strip 11 bottom surfaces attach peel off, produce the space, allow packaging adhesive material be flow to the contact surface that is originally enveloped by glued membrane 100.If the glue phenomenon of overflowing can't effectively be avoided, will greatly affect product yield.
Therefore, be necessary to provide a kind of conductive wire frame strip of non-exterior pin semiconductor packaging construction, to solve the existing problem of prior art.
The utility model content
The purpose of this utility model is to provide a kind of conductive wire frame strip of non-exterior pin semiconductor packaging construction, its bezel locations is provided with the exhaust guide groove, can improve gas and be present in situation about can't discharge smoothly in the film cave, effectively avoid the excessive glue phenomenon when conductive wire frame strip arranges packaging adhesive material to occur.
For reaching aforementioned purpose of the present utility model, the utility model provides a kind of conductive wire frame strip of non-exterior pin semiconductor packaging construction, and it comprises: a lead frame block comprises a plurality of with the regularly arranged lead frame unit of matrix; At least one frame region is positioned at the periphery of described lead frame block; And a plurality of steam vents, be located in the described frame region, be positioned at the unnecessary gas at described lead frame block place when carrying out the sealing operation with discharge.
In one embodiment of this invention, described steam vent is strip, and comprise transverse row pore and vertical steam vent, wherein the length direction of transverse row pore is parallel with the edge of its place frame region, the edge-perpendicular of the length direction of described vertical steam vent and its place frame region.
In one embodiment of this invention, the back side of described conductive wire frame strip is provided with a gum, and the border that arranges of described gum is positioned at described frame region; Described frame region also contains the border of packaging adhesive material shaped region; And described vertical steam vent extends beyond the border that border and described packaging adhesive material shaped region are set of described gum.
In one embodiment of this invention, described lead frame block has a Cutting Road between described lead frame unit, and the bottom of described Cutting Road has an air discharge duct; And at least one described steam vent is communicated with the air discharge duct of described Cutting Road.
In one embodiment of this invention, described lead frame block has a Cutting Road between described lead frame unit, and the bottom of described Cutting Road has an air discharge duct; And the corresponding air discharge duct that is communicated with described Cutting Road of at least one described vertical steam vent.
In one embodiment of this invention, the equal corresponding air discharge duct that is communicated with described Cutting Road of described vertical steam vent.
In one embodiment of this invention, described vertical steam vent comprises a strip parts and a head, and described head is connected in an end of described strip parts and exceeds described gum the border being set and expose.
In one embodiment of this invention, the head of described vertical steam vent is semicircle shape.
In one embodiment of this invention, described vertical steam vent is distributed between the adjacent transverse row pore.
In one embodiment of this invention, comprise plural at least transverse row pore between adjacent two vertical steam vents.
The utility model is by the bezel locations at conductive wire frame strip steam vent to be set, the gas that sealing operation fashion is stored in the film cave can be dredged away by steam vent, and can in space, film cave, not cause local gas pressure and cause gum to break away from, thereby avoided the generation of excessive glue phenomenon.
Description of drawings
Figure 1A, 1B and 1C are the manufacturing process schematic diagrames of an existing square flat outer-pin-free packaging structure (QFN).
Fig. 2 is the part plan schematic diagram of the conductive wire frame strip of the utility model one embodiment non-exterior pin semiconductor packaging construction.
Fig. 3 is the local enlarged diagram of Fig. 2.
Fig. 4 is the partial enlarged drawing at the back side of the conductive wire frame strip of the utility model one embodiment non-exterior pin semiconductor packaging construction.
Embodiment
For allowing the utility model above-mentioned purpose, feature and advantage become apparent, the utility model preferred embodiment cited below particularly, and cooperation accompanying drawing are described in detail below.Moreover, the direction term that the utility model is mentioned, such as " on ", D score, 'fornt', 'back', " left side ", " right side ", " interior ", " outward ", " side " etc., only be the direction with reference to annexed drawings.Therefore, the direction term of use is in order to explanation and understands the utility model, but not in order to limit the utility model.
Please refer to shown in Figure 2ly, it discloses the part plan schematic diagram of the conductive wire frame strip of the utility model one embodiment non-exterior pin semiconductor packaging construction.The utility model is mainly used in manufacturing the Structure Improvement of the conductive wire frame strip of non-exterior pin semiconductor packaging construction (QFN), and conductive wire frame strip of the present utility model mainly comprises a lead frame block 3, at least one frame region 5 and a plurality of steam vent 4.
Described lead frame block 3 comprises a plurality of with the regularly arranged lead frame unit 30 of matrix, and each described lead frame unit 30 can comprise a chip bearing and several contacts, described contact normally around be arranged in described chip bearing around.Described frame region 5 is positioned at the periphery of described lead frame block 3, with the lead frame block 3 of rectangle, can comprise four described frame region 5 around the described conductive wire frame strip.Conductive wire frame strip of the present utility model generally is by gum (or claim glued membrane) is set at its back side, and as bearing part (as shown in Figure 2), the boundary B that arranges of described gum for example is to be positioned at described frame region 5 with gum.Conductive wire frame strip of the present utility model can be made by a metallic plate (such as copper, iron, aluminium, nickel, zinc or its alloy etc.), for example first the first surface of described metallic plate is carried out etching partially operation (but choice for use wet chemical etch or dry-type and physical etching are carried out) first time, to define described lead frame block 3 and described frame region 5, in described lead frame block 3, comprise the chip bearing of each lead frame unit 30 and the configuration of several contacts; Then operation is carried out etching partially in the second surface of described metallic plate the second time, separating described chip bearing and contact, thereby consist of described lead frame unit 30; Can a chip be fixed on the described chip bearing corresponding each lead frame unit 30 afterwards; Recycle several wires and be electrically connected described chip and described contact; And, utilize a packaging adhesive material to coat the described chip of protection, described wire and described lead frame unit 30 on the surface of chip side; Carry out again at last cutting operation, to consist of a plurality of independently non-exterior pin semiconductor packaging constructions.
Described a plurality of steam vent 4 is located in described at least one frame region 5, and it can be shaped in the lump or be shaped by laser drill in addition with lead frame unit 30 etching partially in the operation of described conductive wire frame strip.The major function of described a plurality of steam vent 4 is in order to discharge the unnecessary gas that is positioned at described lead frame block 3 places when described conductive wire frame strip carries out the sealing operation.
In more detail, please refer to shown in Figure 3ly, it is the local enlarged diagram of Fig. 2.Described steam vent 4 all is strip, and comprise transverse row pore 40 and vertical steam vent 41, wherein the length direction of transverse row pore 40 is parallel with the edge of its place frame region 5, the edge-perpendicular of the length direction of described vertical steam vent 41 and its place frame region 5.In the present embodiment, as shown in Figure 3, described frame region 5 also contains the border A of packaging adhesive material shaped region; Described vertical steam vent 41 extends beyond the border A that boundary B and described packaging adhesive material shaped region are set of described gum.As shown in Figure 3, described vertical steam vent 41 comprises a strip parts 410 and a head 411, and described head 411 is connected in an end of described strip parts 410 and exceeds described gum border A being set and expose.The head 411 of described vertical steam vent 41 for example is semicircle shape, and the width of wherein said head 411 is R; The width of described strip parts 410 is b, and in the present embodiment, R for example equals 2.8b.
In the present embodiment, described vertical steam vent 41 is distributed between the adjacent transverse row pore 40; Wherein comprise plural at least transverse row pore 40 between adjacent two vertical steam vents 41; The width L of described transverse row pore 40 can for example be drawn by following formula: L=[D-(N+1) * d]/N, wherein D is that width, the d of described lead frame unit 30 are that minimum range, the N that etching need to keep is the requirement that is arranged in the transverse row pore 40 on the straight line, for example 2 or 3.
Moreover, as shown in Figure 4, also has a Cutting Road 300 between the described lead frame block 30, the bottom of described Cutting Road 300 has an air discharge duct 301, described air discharge duct 301 is the strip shallow grooves that form with etching solution or laser, described Cutting Road 300 and air discharge duct 301 favourable follow-up cutting operations thereof.For more effective gas is discharged, at least one described steam vent 4 can be communicated with the air discharge duct 301 of described Cutting Road 300, for example, in the present embodiment, by described vertical steam vent 41 corresponding air discharge ducts that are communicated with described Cutting Road 300 bottoms, this moment described vertical steam vent 41 described strip parts 410 around also can etch partially and form a depression exhaust gas region (indicate), described depression exhaust gas region cooperates more with described air discharge duct can discharge unnecessary gas effectively.Preferably, all described vertical steam vents 41 all are communicated with the air discharge duct 301 of described Cutting Road 300, and all directions of described like this lead frame block 30 all are conducive to discharge unnecessary gas.
The conductive wire frame strip of the utility model non-exterior pin semiconductor packaging construction is after through chip setting and routing operation; then can coat the described chip of protection, wire and described conductive wire frame strip near the surface of described chip side a packaging adhesive material is set, to consist of non-exterior pin semiconductor packaging construction.In the process of packaging adhesive material is set, on described conductive wire frame strip can be positioned over and have, in the mould of counterdie, then again mould is vacuumized, again packaging adhesive material is injected subsequently in the die cavity space of mould, described packaging adhesive material is full of whole die cavity space, and then coating chip, wire and described conductive wire frame strip are near the surface of described chip side, move and remain bottom and the edge that survival gas in the die cavity space is subject to pushing toward described conductive wire frame strip, described survival gas can advance toward described steam vent 4 along the Cutting Road at the described conductive wire frame strip back side, and then enter in the space of described steam vent 4 or be discharged to the external world from the head 411 of vertical steam vent 41, make conductive wire frame strip be subject to local gas pressure and be unlikely, cause peeling off of gum.
As mentioned above, compared to the conductive wire frame strip of existing non-exterior pin semiconductor packaging construction easily in the sealing operation process, because the local pressure that survival gas causes causes the part gum to be peeled off from conductive wire frame strip, and then allow packaging adhesive material overflow into the conductive wire frame strip back side, affect the shortcoming of product yield, the conductive wire frame strip of the present utility model of Fig. 2 arranges the steam vent with degassing function by the position in frame region, the gas that sealing operation fashion is stored in the die cavity can be dredged away by described steam vent, and can in the die cavity space, not cause local gas pressure and cause gum to break away from, thereby avoided the generation of excessive glue phenomenon, the yield of improving product.
The utility model is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present utility model.Must be pointed out that, published embodiment does not limit scope of the present utility model.On the contrary, being contained in the spirit of claims and modification and impartial setting of scope is included in the scope of the present utility model.
Claims (10)
1. the conductive wire frame strip of a non-exterior pin semiconductor packaging construction, it is characterized in that: described conductive wire frame strip comprises:
One lead frame block comprises a plurality of with the regularly arranged lead frame unit of matrix;
At least one frame region is positioned at the periphery of described lead frame block; And
A plurality of steam vents are located in the described frame region, are positioned at the unnecessary gas at described lead frame block place when carrying out the sealing operation with discharge.
2. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 1 is characterized in that:
Described steam vent is strip, and comprises transverse row pore and vertical steam vent, and wherein the length direction of transverse row pore is parallel with the edge of its place frame region, the edge-perpendicular of the length direction of described vertical steam vent and its place frame region.
3. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 2 is characterized in that:
The back side of described conductive wire frame strip is provided with a gum, and the border that arranges of described gum is positioned at described frame region;
Described frame region also contains the border of packaging adhesive material shaped region; And
Described vertical steam vent extends beyond the border that border and described packaging adhesive material shaped region are set of described gum.
4. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 1 is characterized in that:
Described lead frame block has a Cutting Road between described lead frame unit, the bottom of described Cutting Road has an air discharge duct; And
At least one described steam vent is communicated with the air discharge duct of described Cutting Road.
5. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 2 or claim 3 is characterized in that:
Described lead frame block has a Cutting Road between described lead frame unit, the bottom of described Cutting Road has an air discharge duct; And
The corresponding air discharge duct that is communicated with described Cutting Road of at least one described vertical steam vent.
6. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 5 is characterized in that:
Described vertical steam vent is the corresponding air discharge duct that is communicated with described Cutting Road all.
7. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 3 is characterized in that:
Described vertical steam vent comprises a strip parts and a head, and described head is connected in an end of described strip parts and exceeds described gum the border being set and expose.
8. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 7 is characterized in that:
The head of described vertical steam vent is semicircle shape.
9. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 2 is characterized in that:
Described vertical steam vent is distributed between the adjacent transverse row pore.
10. the conductive wire frame strip of non-exterior pin semiconductor packaging construction as claimed in claim 9 is characterized in that:
Comprise plural at least transverse row pore between adjacent two vertical steam vents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220703103 CN203242616U (en) | 2012-12-18 | 2012-12-18 | No-lead leadframe bar for semiconductor packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220703103 CN203242616U (en) | 2012-12-18 | 2012-12-18 | No-lead leadframe bar for semiconductor packaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203242616U true CN203242616U (en) | 2013-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220703103 Expired - Fee Related CN203242616U (en) | 2012-12-18 | 2012-12-18 | No-lead leadframe bar for semiconductor packaging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203242616U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050469A (en) * | 2012-12-18 | 2013-04-17 | 苏州日月新半导体有限公司 | Outer-lead-free lead frame strip of semiconductor encapsulation structure |
-
2012
- 2012-12-18 CN CN 201220703103 patent/CN203242616U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050469A (en) * | 2012-12-18 | 2013-04-17 | 苏州日月新半导体有限公司 | Outer-lead-free lead frame strip of semiconductor encapsulation structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20201218 |