CN100511588C - Lead frame chip-level encapsulation method - Google Patents
Lead frame chip-level encapsulation method Download PDFInfo
- Publication number
- CN100511588C CN100511588C CN 200610072885 CN200610072885A CN100511588C CN 100511588 C CN100511588 C CN 100511588C CN 200610072885 CN200610072885 CN 200610072885 CN 200610072885 A CN200610072885 A CN 200610072885A CN 100511588 C CN100511588 C CN 100511588C
- Authority
- CN
- China
- Prior art keywords
- lead frame
- chip
- pin
- lead
- many
- 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
Links
Images
Classifications
-
- 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
- H01L2224/4826—Connecting between the body and an opposite side of the item with respect to the body
Landscapes
- Lead Frames For Integrated Circuits (AREA)
Abstract
The invention proposes a lead frame type chip packaging method. The invention is similar to a conventional chip hook, but has a main difference that an inside pin of a lead frame is bended towords a side of the lead frame in addvance to form a space capable of supporting a chip and a lead, while an outside pin is directly exposed under a packaging colloid, and the outside pin is not bended and shaped when removing the frame. In addition, the packaged chip of the invention is face-down positioned on the lead frame, and the lead is connected to the lead frame via an opening of the lead frame by a solder pad positioned at a face of the chip, thereby the lead is under the lead frame. Another characteristic of the invention is that, after packaging, extravasated colloid or waste colloid are removed in a laser manner but only in a mechanical die or an electrolytic manner.
Description
Technical field
The present invention relates to a kind of method of wafer-level package, particularly relate to a kind of method of lead frame chip-level encapsulation.
Background technology
Because various electronic products are increasingly sophisticated and compact, in order to cooperate this trend, the encapsulation of chip also begin extensively to adopt so-called chip size packages or wafer-level package (chip scale package, CSP).IPC (Interconnecting and Packaging electronicCircuit) definition according to EIA (Electronic IndustriesAssociation), the area that wafer-level package is meant encapsulation back adhesive body is less than 1.2 times chip size, and can directly utilize the encapsulation of surface mount technology processing (direct surfacemountable).
Wafer-level package has various ways, generally can be categorized as (1) base plate type (substrate-based) wafer-level package, is with the support as chip of hard (rigid) or soft (flex) substrate; (2) lead frame type (leadframe-based) wafer-level package is to be the support of chip with the lead frame; (3) wafer scale (wafer-level) wafer-level package.Wherein, lead frame chip-level encapsulation is fit to the application of high frequency (more than 400MHz), low pin number (below 100) very much, for example the communication chip of mobile phone, digital signal processing chip and be the memory chip etc. of representative with DDR II.In addition, the processing procedure that the lead frame chip-level encapsulation is adopted is very similar or identical with the material also encapsulation technology with traditional, so also have superiority on qualification rate and cost.
In existing encapsulation technology, there is a kind of chip that is called to hang the structure dress (lead on chip, mode LOC) is in conjunction with lead frame and chip.LOC is exactly the meaning of lead frame on chip as its name suggests, and the pin that LOC exposes outside adhesive body normally adopts gull wing pin (gullwing-leads).Figure 1 shows that the generalized section of TSOP (the thin small outline package) encapsulating structure of the existing LOC of employing mode.As shown in the figure, chip 10 is with the below of adhesive tape 30 attached to lead frame 20 inner pins, lead frame 20 is to finish by the routing (wirebonding) of lead 50 with the electric connection of chip 10, the last adhesive body of using epoxy resin again (epoxy moldingcompound, EMC) get up by 40 sealing.The above-mentioned LOC practice has many advantages, and for example the short distance of lead 50 is helpful for stablizing of electrical characteristic.Its shortcoming is that gull wing pin extends to outside the adhesive body, so its height (usually about 1.27mm) all has suitable room for improvement with width (usually about 9.22mm).
Summary of the invention
The present invention is proposed a kind of method of lead frame chip-level encapsulation by the problems referred to above.The present invention basically with existing LOC technology type seemingly, its main feature can be summarized as follows.At first, the inside pin of the lead frame among the present invention is prior one side bending with its guide coil holder, formation can the support chip support and the space of lead, external pin then directly is exposed to the adhesive body below, no longer does the external pin bending afterwards and be shaped when removing frame.
In addition, the chip after the present invention encapsulation is the top that face down is positioned at lead frame, and lead then is connected to lead frame by the opening of the weld pad that is positioned at chip front side by lead frame, so lead is below lead frame.These all are different 0 parts with the LOC encapsulated result.Another characteristics of the present invention are after sealing, not with the machine die or the mode of electrolysis, but remove overflow glue or scrap rubber in the mode of laser (laser), make complete the coming out of external pin, with the electric stability that keeps follow-up electroplating effect and use.
The encapsulating structure that this method is finished is through actual test, compared with prior art its beneficial effect is: meet the dimensional requirement of wafer-level package, highly low (near 1mm) fully but the supporting chip frequency at least more than the 667MHz, lead frame directly assists heat radiation, so thermal diffusivity is good, stability is high.In addition with the TSOP mode relatively, the encapsulating structure that this method is finished is all similar with TSOP on the cost of packaging cost, testing cost, SMT and qualification rate and maintenance cost.
The detailed description of following conjunction with figs., specific embodiment, on address other purpose of the present invention and advantage is made detailed description.The purpose that drawings and the specific embodiments describe in detail is to make those skilled in the art can understand spirit of the present invention in view of the above, and should not be considered as limitation of the scope of the invention.Relevant scope of the present invention please be joined super claim part.
Description of drawings
Figure 1 shows that the generalized section of the encapsulating structure of existing employing LOC mode.
Fig. 2 a to Fig. 2 e is depicted as the generalized section of encapsulating structure after each step of the present invention.
Be respectively the non-schematic diagram that removes glue and remove electroplating effect behind the glue with laser mode with laser mode of external pin 111 shown in Fig. 3 a, Fig. 3 b.
The primary clustering symbol description
10 chips, 20 lead frames
30 adhesive tapes, 40 adhesive bodies
50 leads
100 lead frames, 110 inner pins
111 external pins, 120 openings
200 adhesive tapes, 300 chips
310 weld pads, 400 leads
500 adhesive bodies
Embodiment
The present invention is the method that proposes a kind of lead frame chip-level encapsulation.The processing procedure of this method and traditional LOC is roughly similar, but in the content of some steps significant difference is arranged then.Below, this specification will be primarily aimed at not exist together and be illustrated, and then seldom give unnecessary details for part same as the prior art.
The 1st step of this method provides a suitable lead frame 100 shown in Fig. 2 a.This lead frame can be customized according to the difference of encapsulation back application, and its characteristics are that a plurality of pins (comprising inner pin 110 and external pin 111) of lead frame 100 are positioned at relative both sides at least and lead frame 100 suitable distance around it leaves suitable opening 120.Its weld pad of the chip that the present invention was suitable for (bond pad) is positioned at its positive appropriate location.And opening 120 mainly can make its weld pad come out so that routing with chips incorporate the time exactly.
The bending (for example forming gull wing pin shown in Figure 1) of general lead frame external pin is to carry out in the step of going frame shaping (forming/singulation).But the inside pin 110 of the lead frame 100 among the present invention is prior first bending with its guide coil holder 100, formation can the support chip support and the space of lead, external pin 111 then is the below that is directly exposed to adhesive body, no longer does the external pin bending afterwards when going frame to be shaped.This is that the practice with LOC one of does not exist together.
The 1st step of this method also is included in one side (to call first face in the following text), inner pin 110 opposite positions (promptly around opening 120) of lead frame 100 and lays at least one adhesive tape 200, the two sides of adhesive tape 200 all is provided with adhesive agent, the back side of one side and inner pin 110 is glutinous to be connected, and another side is then even glutinous at next step and chip.Adhesive tape 200 normally adopts polyimide (PI) (but not as limit), has characteristics such as low ionic weight and thermal endurance height.Lead frame is to adopt high conductivity, high heat conducting metal material, for example copper mostly 100.
Except adopting adhesive tape to do chip and the glutinous method that connects of the inner pin of lead frame, also having some existing technology is to adopt the mode of some glue.The advantage of some glue is (because the cost of jelly is much lower) with low cost, but because the inside pin of lead frame is very little, the position of some glue and the accurate control of glue amount are not easy to reach very much, and adopt two-sided tape just not have these problems.The jelly that is adopted is the same with adhesive tape, must ability high heat, with characteristic such as moisture-resistant gas cut erosion, to have curing (curing) time shortly to wait requirement in addition.
The 2nd step of this method finished glutinous crystalline substance (die bond or die mount or die attach) with 200 glutinous companies of adhesive tape of 100 first of the front and the lead frames of the chip (die) 300 after the wafer cutting and separating shown in Fig. 2 b.Usually the chip after the cutting be proper alignment on adhesive tape, then these chips are delivered to glutinous brilliant machine, take off from adhesive tape by glutinous brilliant machine, be placed on the lead frame accurately then.The weld pad 310 of glutinous brilliant back chip 300 can come out from the opening 120 of lead frame 100, so that the step of follow-up routing.In addition, though the result shown in Fig. 2 b is similar with LOC encapsulating structure shown in Figure 1, follow-up chip 300 after this method encapsulation is tops that face down is positioned at lead frame 100, is suspended on the lead frame below but not face up.This also is that the practice with LOC one of does not exist together.
The 3rd step of this method electrically connects with inner pin 110 with the weld pad 310 of lead 400 with chip 300 with existing method shown in Fig. 2 c.Lead 400 is generally gold (Au) line or adopts the metal material (for example aluminium) of similar high conductivity.Because the adhesive body height that this method produces is very low,, hangs down better the height of lead 400 projections so must controlling to more.Though the result shown in Fig. 2 c is similar with LOC encapsulating structure shown in Figure 1, follow-up chip 300 after this method encapsulation is tops that face down is positioned at lead frame 100, so lead 400 can be below lead frame 100 and above lead frame.This also is that the practice with LOC one of does not exist together.
The sealing (molding) of the 4th step shown in Fig. 2 d of this method.For the encapsulation kenel that similar the present invention adopts lead frame, does to electrically connect with routing, the modal practice is exactly metaideophone be shaped (transfer molding).The glue cake preheating that encapsulating material is made drops in the transfer cylinder (transfer pot) of sealing equipment (transfer-molding machine) more earlier; In transfer cylinder, be subjected under the Temperature Influence, the glue cake begins to take place chemical reaction and fast softening in transfer cylinder, sealing equipment then begins pressurization with plunger (plunger) to softening glue cake, makes its runner along mould (runner) flow into die cavity, and the whole die cavity of filling also coats electronic chip.Encapsulating material is finished the process that coats electronic chip in die cavity, handle (postcuring) through the back thermalization again and reach suitable sclerosis, and opening mold ejects die cavity to obtain finished product with finished product, finishes the program of sealing.The above practice is existing technology, and difference is that external pin 111 is directly by exposing above the adhesive body among the figure 500.In addition, also can remove overflow glue or scrap rubber (deflash) after the general sealing via the machine die or the mode of electrolysis.The encapsulating structure external pin 111 of this method is to be embedded in 500 li of adhesive bodies basically, need complete coming out, the electric stability that could keep follow-up electroplating effect and use, thus this method a main characteristics is arranged is to remove overflow glue or scrap rubber in the mode of laser (laser).
The 5th step of this method is the plating (solderplating) to external pin 111, to prevent its oxidation and to keep good weldering property.The material of electroplating can be used terne metal (Pb/Sn), then can adopt tin bismuth (Sn/Bi) alloy if adopt unleaded processing procedure.Fig. 3 a, Fig. 3 b are depicted as the non-schematic diagram that removes glue and remove electroplating effect behind the glue with laser mode with laser mode of external pin 111.The 6th step of this method is frame, uses the cutter device with lead frame and frame cutting and separating.The external pin 111 of this method does not need to carry out the shaping action of external pin bending because outside being exposed to.So far, the encapsulation of each chip 300 just is through with basically, and it is turned i.e. form shown in Fig. 2 e.Note that to have in the above-mentioned steps and omit some and do not influence the step of this method exploitativeness, for example laser lettering (laser marking) with detect (inspection) or the like.
The above detailed description of preferred embodiments is to wish to know more to describe feature of the present invention and spirit, and with the above-mentioned preferred embodiment of being set forth scope of the present invention is limited.On the contrary, its objective is that hope can be covered by the modification of various changes and identity property in the claim scope of the present invention.
Claims (3)
1. lead frame chip-level encapsulation method, this method a plurality of weld pads of suitable chip be positioned at its positive appropriate position placed in the middle, it is characterized in that this method comprises the following step at least:
(1) provides a lead frame, this lead frame has many pins, each pin is coated on the inside pin in the adhesive body and is exposed to outer external pin after being divided into encapsulation, leave a suitable opening in this lead frame, this inside pin is to first bending of this lead frame, form the support of this chip of support and the space of lead, this first face of this inside pin is provided with a kind of suitable glutinous mode that connects;
(2) with this front of this chip and this first glutinous company of this inside pin, its weld pad is exposed by this opening;
(3) connect these a plurality of weld pads and these many inner pins respectively with many leads;
(4) with a kind of suitable this chip of material sealing, these many leads, these many inner pins, and these many external pins one side of finished product after the sealing is appeared, remove the material for sealing of these many external pin remnants with a kind of suitable laser means;
(5) electroplate these many external pins with a kind of suitable material; And
(6) finished product after will encapsulating and the frame cutting and separating of this lead frame.
2. lead frame chip-level encapsulation method as claimed in claim 1 is characterized in that, this suitable glutinous even mode is a two-sided tape.
3. lead frame chip-level encapsulation method as claimed in claim 1 is characterized in that, electroplating this used suitable material is sn-bi alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610072885 CN100511588C (en) | 2006-04-14 | 2006-04-14 | Lead frame chip-level encapsulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610072885 CN100511588C (en) | 2006-04-14 | 2006-04-14 | Lead frame chip-level encapsulation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101055840A CN101055840A (en) | 2007-10-17 |
| CN100511588C true CN100511588C (en) | 2009-07-08 |
Family
ID=38795584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610072885 Expired - Fee Related CN100511588C (en) | 2006-04-14 | 2006-04-14 | Lead frame chip-level encapsulation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100511588C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8553420B2 (en) | 2010-10-19 | 2013-10-08 | Tessera, Inc. | Enhanced stacked microelectronic assemblies with central contacts and improved thermal characteristics |
| US8952516B2 (en) | 2011-04-21 | 2015-02-10 | Tessera, Inc. | Multiple die stacking for two or more die |
| US8304881B1 (en) | 2011-04-21 | 2012-11-06 | Tessera, Inc. | Flip-chip, face-up and face-down wirebond combination package |
| US8970028B2 (en) | 2011-12-29 | 2015-03-03 | Invensas Corporation | Embedded heat spreader for package with multiple microelectronic elements and face-down connection |
| US8928153B2 (en) | 2011-04-21 | 2015-01-06 | Tessera, Inc. | Flip-chip, face-up and face-down centerbond memory wirebond assemblies |
| US9013033B2 (en) | 2011-04-21 | 2015-04-21 | Tessera, Inc. | Multiple die face-down stacking for two or more die |
| US8633576B2 (en) | 2011-04-21 | 2014-01-21 | Tessera, Inc. | Stacked chip-on-board module with edge connector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153287C (en) * | 2001-03-09 | 2004-06-09 | 矽品精密工业股份有限公司 | Semiconductor package with built-in heat dissipating block |
-
2006
- 2006-04-14 CN CN 200610072885 patent/CN100511588C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153287C (en) * | 2001-03-09 | 2004-06-09 | 矽品精密工业股份有限公司 | Semiconductor package with built-in heat dissipating block |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101055840A (en) | 2007-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100511588C (en) | Lead frame chip-level encapsulation method | |
| US20110111562A1 (en) | Partially Patterned Lead Frames and Methods of Making and Using the Same in Semiconductor Packaging | |
| CN105720034B (en) | Lead frame, semiconductor device | |
| CN102931161A (en) | Semiconductor packaging member and making method of same | |
| CN101540289A (en) | Semiconductor integrated circuit package and method for packaging semiconductor integrated circuit | |
| CN102446882A (en) | Semiconductor PiP (package in package) system structure and manufacturing method thereof | |
| US20200373230A1 (en) | Leadframe package using selectively pre-plated leadframe | |
| CN101361181A (en) | Leadframes for improved moisture reliability and enhanced solderability of semiconductor devices | |
| US20130115737A1 (en) | Method of manufacturing a semiconductor device with outer leads having a lead-free plating | |
| CN102231372B (en) | Multi-turn arranged carrier-free IC (Integrated Circuit) chip packaging component and manufacturing method thereof | |
| TW202249220A (en) | Configurable leaded package | |
| JP2016134545A (en) | Semiconductor device manufacturing method | |
| CN102222658B (en) | Multi-circle arranged IC (integrated circuit) chip packaging member and producing method thereof | |
| US10049966B2 (en) | Semiconductor device and corresponding method | |
| CN103065975A (en) | Manufacturing method for rewiring quad flat no-lead (QFN) packaging component | |
| US10128130B2 (en) | Method for manufacturing a semiconductor device | |
| CN103050452A (en) | Rewiring high-density AAQFN (Area Array Quad Flat No-lead) packaging device and manufacture method thereof | |
| CN212695146U (en) | Chip packaging substrate and chip packaging structure | |
| CN102044445B (en) | Method for manufacturing lead frame of no-lead semiconductor package (QFN) | |
| TWI294680B (en) | ||
| CN212113712U (en) | Semiconductor package lead frame | |
| CN111799243A (en) | Chip packaging substrate and manufacturing method thereof, chip packaging structure and packaging method | |
| CN101477974B (en) | Glue sealing method of conductive wire frame strip, and semiconductor encapsulation construction having the conductive wire frame | |
| CN103247539B (en) | The epoxy resin outflow prevention method of lead frame and the lead frame manufactured with it | |
| CN202996820U (en) | Rewiring QFN package device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20110414 |