WO2010038450A1 - リードフレーム基板及びその製造方法 - Google Patents
リードフレーム基板及びその製造方法 Download PDFInfo
- Publication number
- WO2010038450A1 WO2010038450A1 PCT/JP2009/005033 JP2009005033W WO2010038450A1 WO 2010038450 A1 WO2010038450 A1 WO 2010038450A1 JP 2009005033 W JP2009005033 W JP 2009005033W WO 2010038450 A1 WO2010038450 A1 WO 2010038450A1
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- WIPO (PCT)
- Prior art keywords
- semiconductor element
- metal plate
- outer frame
- connection terminal
- lead frame
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000000034 method Methods 0.000 title claims description 17
- 239000004065 semiconductor Substances 0.000 claims abstract description 84
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- 238000010438 heat treatment Methods 0.000 description 4
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- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the groups H01L21/18 - H01L21/326 or H10D48/04 - H10D48/07
- H01L21/4814—Conductive parts
- H01L21/4821—Flat leads, e.g. lead frames with or without insulating supports
- H01L21/4828—Etching
- H01L21/4832—Etching a temporary substrate after encapsulation process to form leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
-
- 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
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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
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/45099—Material
- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
- H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/45144—Gold (Au) as principal constituent
-
- 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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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3121—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation
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- 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
Definitions
- the present invention relates to a semiconductor package substrate for mounting a semiconductor element, and more particularly to a lead frame substrate and a manufacturing method thereof.
- outer leads for connection to a printed wiring board are arranged on the side surface of the semiconductor package.
- the lead frame forms the desired photoresist pattern on both sides of the metal plate and etches from both sides to fix the inner lead and outer leads, which are the connection parts with the semiconductor element mounting part and the semiconductor element electrode.
- the outer frame portion can be obtained. Moreover, it can obtain also by the punching process by a press other than an etching construction method.
- the electrode of the semiconductor element and the inner lead are electrically connected using a gold wire or the like. Thereafter, the vicinity of the semiconductor element including the inner lead portion is sealed with resin, the outer frame portion is cut, and the outer lead is bent as necessary.
- the outer leads placed on the side in this way are limited to 200 to 300 pins in a package size of about 30 mm square in view of the processing capability of miniaturization.
- Patent Document 1 a BGA type semiconductor package structure using a lead frame using a process of etching the lead frame from both sides is disclosed.
- connection terminals of the semiconductor element electrodes are formed on one surface, and the external connection terminals are formed in an array on the other surface.
- FIGS. 5A and 5B Sectional views of the prior art are shown in FIGS. 5A and 5B.
- the length of the wiring 110 on the semiconductor element electrode connection terminal 109 side becomes longer.
- This wiring is produced by half-etching a metal plate. The width and thickness of the wiring are small, and there is a problem that the yield is very poor due to the occurrence of bending or bending in the steps after the etching.
- Patent Document 1 discloses that half etching is performed only on the external connection terminal 111 side, an electrodeposited polyimide layer 117 is formed on the etched surface, and then the semiconductor element electrode connection terminal 109 side is formed by etching. As a result, the fine wiring 110 is supported by the polyimide resin layer 117 although it is a thin film, and the bending and bending of the wiring during the production of the lead frame are avoided.
- connection terminal 109 when a semiconductor element is mounted on the lead frame substrate of this structure and the semiconductor element electrode and the connection terminal 109 are connected by wire bonding, the lower part of the connection terminal 109 is hollow, so that the wire connection force is applied. Therefore, there was a problem that poor connection occurred and the assembly yield was significantly reduced.
- Patent Document 1 Although not described in Patent Document 1, one measure is conceivable in which a resin layer is thickened by potting a premold resin instead of the electrodeposited polyimide layer. According to this, it is assumed that the problem of bonding failure can be avoided to some extent. However, this contrivance is by no means a satisfactory technique. This is because the hollow state cannot be completely avoided by this. In addition, it is very difficult to adjust the amount of the premold resin applied, and if the amount of application increases, there is a concern that a resin layer is formed on the external connection terminal 111 and some removal process is required.
- the pre-mold resin is generally a thermosetting epoxy resin system
- curing shrinkage is inevitable, and adhesion may not be secured on the metal surface after etching, and peeling may occur due to heat treatment during the assembly process.
- problems may occur and reliability cannot be ensured in the temperature cycle test.
- the present invention was invented in view of such problems of the prior art, can cope well with the increase in the number of electrodes of a semiconductor element, has high reliability, and can be easily and stably assembled and assembled in a semiconductor package. It is an object of the present invention to provide a lead frame substrate that can be used and a manufacturing method thereof.
- a semiconductor element mounting portion for mounting a semiconductor element on a first surface of a metal plate, a semiconductor element electrode connection terminal for connecting to an electrode of the semiconductor element, and a first outer frame Forming a photoresist pattern for forming each of the first and second portions, and forming at least part of the second connecting portion, the second outer frame portion, and the second outer frame portion on the second surface of the metal plate.
- a groove portion that traverses from the inside to the outside of the outer frame portion is formed by etching, and a resin layer is formed on the hole portion and the groove portion by heating and pressurizing and applying a premold resin with a flat plate press.
- the second aspect of the present invention is characterized in that after the hole and the groove are formed in the exposed portion of the metal plate on the second surface, a roughening process is performed on the etched surface. It is a manufacturing method of the lead frame substrate according to the embodiment.
- a metal plate having a first surface and a second surface, a semiconductor element mounting portion formed on the first surface and mounting a semiconductor element, and the first surface.
- a semiconductor element electrode connection terminal for connecting to the electrode of the semiconductor element; a first outer frame portion formed on the first surface; and the semiconductor element formed on the second surface.
- a fourth aspect of the present invention is the lead frame substrate according to the third aspect, wherein the hole portion has a roughened surface.
- external connection terminals for connecting to a printed wiring board can be arranged in an array on the entire back surface of the lead frame substrate, which can cope with an increase in the number of terminals of semiconductor elements. Further, since the substrate is based on a lead frame and does not use plated wiring, reliability against thermal stress can be ensured. On the other hand, defects such as wiring breakage and bending do not occur during the production of the lead frame substrate, and during wire bonding, which is the semiconductor package assembly process, the pre-mold resin layer is on the surface of the external connection terminal. Therefore, stable connection is possible.
- FIG. 2B is a cross-sectional view in the next step of FIG. 1A, illustrating an example of the lead frame substrate manufacturing method according to the embodiment of the present invention.
- FIG. 3B is a cross-sectional view in the next step of FIG. 1B, illustrating an example of the method for manufacturing the lead frame substrate according to the embodiment of the present invention.
- FIG. 3A is a cross-sectional view in the next step of FIG. 1C, illustrating an example of the method of manufacturing the lead frame substrate according to the embodiment of the present invention.
- FIG. 2D is a cross-sectional view in the next step of FIG.
- FIG. 8C is a cross-sectional view in the next process of FIG. 1E, illustrating an example of the method of manufacturing the lead frame substrate according to the embodiment of the present invention.
- FIG. 8A is a cross-sectional view in the next step of FIG. 1F, showing an example of the method of manufacturing the lead frame substrate according to the embodiment of the present invention.
- FIG. 6 is a top view showing an example of a state after the first etching in the lead frame substrate according to the embodiment of the present invention.
- FIG. 10 is a top view showing another example of the state after the first etching in the lead frame substrate according to the embodiment of the present invention. It is BB sectional drawing of FIG.
- FIG. 3 is a top view of the lead frame substrate according to the embodiment of the present invention on the semiconductor element mounting portion side.
- 1 is a top view of an external connection terminal side, which is a lead frame substrate according to an embodiment of the present invention.
- 1 is a cross-sectional view illustrating an example of a state of wire bonding after mounting a semiconductor element, which is a lead frame substrate according to an embodiment of the present invention.
- FIG. 4B is a cross-sectional view illustrating an example of the state of the lead frame substrate according to the embodiment of the present invention, after the transfer mold sealing is performed after FIG. 4A. It is sectional drawing of the conventional lead frame board
- substrate. 6 is a cross-sectional view of a lead frame substrate of Patent Document 1.
- FIG. 1 is a top view of an external connection terminal side, which is a lead frame substrate according to an embodiment of the present invention.
- 1 is a cross-sectional view illustrating an example of a state of wire bonding after mounting a semiconductor element, which is
- FIG. 1A to FIG. 1G show schematic cross sections of a lead frame substrate manufacturing process according to an embodiment of the present invention.
- a photoresist pattern 2 is formed on both surfaces of a metal plate 1 (FIG. 1A) used for a lead frame (FIG. 1B).
- a pattern of a semiconductor element mounting portion 8, a connection terminal 9 to a semiconductor element electrode, a wiring 10, and an outer frame portion 12 is formed on the upper surface of the metal plate 1, and an external surface is formed on the lower surface of the metal plate 1.
- the connection terminal 11 and the pattern of the outer frame are formed.
- a fine pattern that does not leave a photoresist pattern during etching is formed in the groove forming region (not shown). .
- any material can be used as long as it has etching processability, mechanical strength, thermal conductivity, expansion coefficient, etc. as a lead frame. Alloys and copper alloys to which various metal elements are added in order to improve mechanical strength are often used.
- Etching is performed from the lower surface of the metal plate 1 using an etching solution that dissolves the metal plate, such as ferric chloride solution, to form the hole 3 (FIG. 1C). Since the remaining portion of the metal plate finally becomes a wiring, the depth of the hole 3 is preferably left about 10 to 50 ⁇ m thick so that a fine wiring can be formed at the time of etching from the second upper surface side.
- an etching solution that dissolves the metal plate such as ferric chloride solution
- the region where the groove 4 is formed is not particularly limited as long as it does not affect the mechanical strength, but a general outer frame portion has a positioning hole called a guide hole. It is preferable that a groove is not formed in the peripheral portion. It is preferable to set the depth of the groove part 4 to half or less of the depth of the hole part 3.
- 2C is a cross-sectional view taken along line BB of FIG. 2A.
- 2D is a cross-sectional view taken along the line AA in FIG. 2A. If the depth of the groove portion 4 is too deep, the mechanical strength of the outer frame portion cannot be maintained.
- the depth of the groove 4 can be adjusted by the fine pattern size and pitch size of the photoresist described above.
- a film type pre-mold resin 5 is mounted on the upper surface of the metal plate 1 (FIG. 1D).
- a film-type pre-mold resin is preferable, but a solvent-free or solvent-dilution type liquid pre-mold resin may be applied on the metal plate.
- the plate mold is heated and pressed from both sides, and the premold resin is melt-flowed and temporarily cured (FIG. 1E).
- the premold resin melts and flows, an excess amount of resin flows out of the metal plate from the groove 4, so that the unetched metal surface (external connection terminal 11, outer frame portion 12 other than the groove) and the premold resin surface Can form the same surface, and almost no premold resin remains on the unetched metal surface.
- the melted premold resin flows on the outer frame portion 12, so that the resin remains on the outer frame portion 12, and the resin is also on the external terminals by the thickness. It will remain.
- the thickness is about 20 to 50 ⁇ m, and it is necessary to perform some kind of removal process.
- FIG. 3A A top view on the semiconductor element mounting portion 8 side is shown in FIG. 3A, and a top view on the external connection terminal side is shown in FIG. 3B.
- the external connection terminals can be arranged in an array, and it is possible to cope with the increase in the number of pins of the semiconductor element.
- FIG. 4A shows a cross-sectional view of a lead frame substrate on which the semiconductor element 14 is mounted and wire-bonded.
- the semiconductor element 14 is affixed by the die attach material 15 and connected to the semiconductor element electrode connection terminal 9 by the gold wire 15. If necessary, the semiconductor element electrode connection terminals are subjected to nickel-gold plating, tin plating, silver plating, nickel-palladium-gold plating.
- the lead frame substrate is placed on a heat block and bonded while being heated.
- the premold resin is flush with the lower portion of the semiconductor element electrode connection terminal 9 and does not have a hollow structure. Therefore, it can be assembled without causing poor bonding.
- the semiconductor element side is sealed by transfer molding or potting, and the outer frame portion is separated with a diamond blade or the like to make small pieces (FIG. 4B).
- a semiconductor package using a lead frame substrate can be obtained by mounting solder balls on external connection terminals.
- the package size of the manufactured LGA is 10 mm square, and has a 168-pin array external connection terminal on the bottom of the package.
- a long strip-shaped copper alloy metal plate 1 (Furukawa Electric, EFTEC64T) having a width of 150 mm and a thickness of 200 ⁇ m was prepared.
- EFTEC64T Fluukawa Electric
- FIG. 1B a photoresist (OFPR4000, manufactured by Tokyo Ohka Kogyo Co., Ltd.) is coated on both surfaces of the metal plate 1 to a thickness of 5 ⁇ m with a roll coater, and then pre-baked at 90 ° C. It was.
- pattern exposure is performed from both sides through a photomask having a desired pattern, followed by development with a 1% aqueous sodium carbonate solution, followed by washing with water and post-baking.
- FIG. 1A a long strip-shaped copper alloy metal plate 1 (Furukawa Electric, EFTEC64T) having a width of 150 mm and a thickness of 200 ⁇ m was prepared.
- a photoresist OFPR4000, manufactured by Tokyo Ohka Kogyo Co.
- a photoresist pattern 2 is formed. Obtained.
- a pattern for forming the semiconductor element mounting portion 8, the semiconductor element electrode connection terminal 9, the wiring 10, and the outer frame portion 12 is formed on the first surface, and an external pattern is formed on the second surface.
- the connection terminal 11, the outer frame portion 12, and the outer frame portion 12 were formed with a pattern for forming the groove portions 4 having a width of 5 mm at intervals of about 10 mm from the inside toward the outside.
- dot patterns having a diameter of 30 ⁇ m were arranged in an array at a pitch of 0.8 mm.
- a first etching process is performed from the second surface of the metal plate using a ferric chloride solution.
- the thickness of the metal plate portion exposed from the resist pattern on the second surface side was reduced to 30 ⁇ m (FIG. 1C).
- the depth of the groove 4 was 80 to 100 ⁇ m.
- the specific gravity of the ferric chloride solution was 1.38, and the liquid temperature was 50 ° C.
- the metal plate with the second surface etched was immersed in an aqueous solution of ammonium persulfate at 30 ° C. and 50 g / L for 5 minutes to roughen the surface of the etched surface formed by the first etching (not shown). Further, the photoresist on the second surface was peeled off by dipping in a predetermined aqueous sodium hydroxide stripping solution (not shown).
- thermosetting resin 5 manufactured by Ajinomoto Fine-Techno Co., Ltd., ABF GX-13
- ABF GX-13 first etching
- a vacuum flat plate press apparatus is installed.
- preliminary curing was performed by heating and pressing at 120 ° C. for 5 minutes.
- main curing was performed at 180 ° C. for 3 hours to form a premold layer (FIG. 1E).
- the embedding property of the thermosetting resin was good, and no defects such as voids were observed. Unnecessary resin content was pushed out of the outer frame portion 12 through the groove 4 formed between the press plate 6 and the outer frame portion 12.
- thermosetting resin hardly remained on the surfaces of the external connection terminals 11 and the outer frame portion 12 that were not etched, but the alkaline aqueous solution of potassium permanganate at 60 ° C. was also used for the surface cleaning.
- the treatment was performed for about 3 minutes.
- a second etching process is performed from the first surface side of the metal plate with a ferric chloride solution to dissolve and remove the metal plate portion exposed from the resist pattern.
- the semiconductor element mounting portion 8, the semiconductor element electrode connection terminal 9, the wiring 10, and the outer frame portion 12 were formed (FIG. 1F).
- the external connection terminal 11 extends from the semiconductor element electrode connection terminal 9.
- electrolytic nickel-gold plating was applied to the exposed metal surface.
- the thickness of nickel was 5 ⁇ m, and the thickness of gold was 0.1 ⁇ m (not shown).
- the semiconductor element 13 was mounted on the lead frame type LGA substrate 7 according to the embodiment of the present invention using the die attach material 15, and the die attach material was cured at 150 ° C. for 1 hour. Further, using a gold wire 14 having a diameter of 30 ⁇ m, the electrode of the semiconductor element and the semiconductor element electrode connection terminal 9 were connected by wire bonding (FIG. 4A). When the wire bonding heating temperature was 200 ° C. and the pull strength of the wire on the semiconductor element electrode connection terminal side was measured, it was 9 g or more, and a good connection was obtained.
- the area including the semiconductor element and the semiconductor element electrode connection terminal was sealed with transfer mold resin 16, and cut into small pieces to obtain a semiconductor package using a lead frame type LGA substrate.
- the lead frame substrate and the manufacturing method thereof of the present invention it becomes possible to obtain a lead frame substrate with reduced defects during manufacturing and semiconductor package assembly and improved reliability against thermal stress. It is applied to a multi-pin package substrate that cannot be handled by a frame type semiconductor package.
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Abstract
Description
本願は、2008年9月30日に、日本に出願された特願2008-254311号に基づき優先権を主張し、その内容をここに援用する。
リードフレームは、金属板の両面に所望のフォトレジストパターンを形成し、両面からエッチングすることにより、半導体素子搭載部、半導体素子電極との接続部であるインナーリード、アウターリード、これらを固定している外枠部を得ることができる。また、エッチング工法以外に、プレスによる打ち抜き加工によっても得ることができる。
半導体パッケージの組立工程としては、半導体素子搭載部に半導体素子をダイボンディングしたのち、金ワイヤー等を用いて、半導体素子の電極とインナーリードを電気的に接続する。その後、インナーリード部を含む半導体素子近傍を樹脂封止し、外枠部を断裁し、必要に応じてアウターリードに曲げ加工を施す。
しかしながら、これらの基板の製造は工程が複雑になり、コスト高になるとともに、基板内の配線接続にめっきが使用されているため、リードフレームタイプのパッケージに比べ、信頼性が劣るという問題点がある。
BGAタイプのリードフレームでは、外部接続端子111の数が増加すると、半導体素子電極接続端子109側の配線110長が長くなる。この配線は金属板をハーフエッチングして作製するもので、その幅も厚さも小さく、エッチング以降の工程で折れや曲がりが発生して収率は非常に悪くなるという問題があった。
しかし、この工夫もけっして満足できる技術とは言えない。何故なら、これによっても中空状態を完全に回避できるものではないからである。又、プリモールド樹脂の塗布量の調整が非常に難しく、塗布量が多くなると外部接続端子111上にも樹脂層が形成され、なんらかの除去工程が必要になるという問題が懸念される。又、プリモールド樹脂は一般的には熱硬化エポキシ樹脂系であるため、硬化収縮は避けられず、エッチング後の金属表面では密着性が確保できないことがあり、組立工程中の加熱処理で剥離が発生したり、温度サイクルテストにおいて信頼性が確保できないといった問題も懸念される。
一方、リードフレーム基板の作製時において、配線の折れや曲がり等の不良が発生せず、半導体パッケージ組み立て工程であるワイヤーボンディング時において、ワイヤーボンディング接続端子の下部はプリモールド樹脂層が外部接続端子表面と面一に存在するため、安定して接続が可能となる。
次いで、図1Bに示すように、金属板1の両面に、ロールコーターでフォトレジスト(東京応化(株)製、OFPR4000)を5μmの厚さになるようにコーティングした後、90℃でプレベークを行った。次に、所望のパターンを有するフォトマスクを介して両面からパターン露光し、その後1%炭酸ナトリウム水溶液で現像処理を行った後に水洗及びポストベークを行い、図1Bに示すようにフォトレジストパターン2を得た。
フォトレジストパターンとしては、第1の面には、半導体素子搭載部8、半導体素子電極接続端子9、配線10、外枠部12を形成するためのパターンを形成し、第2の面には外部接続端子11、外枠部12、および、外枠部12に内側から外側に向けて幅5mmの溝部4をおよそ10mm間隔に形成するためのパターンを形成した。溝部4を形成するためのパターンとして、30μm径のドットパターンを0.8mmピッチでアレイ状に配置した。
熱硬化樹脂の埋め込み性は良好で、ボイド等の不良は観察されなかった。また、不要な樹脂分はプレス板6と外枠部12の間に形成された溝部4を通り、外枠部12外側に押し出された。このため、外部接続端子11、外枠部12のエッチングされなかった面上には、ほとんど熱硬化樹脂が残存しなかったが、その表面洗浄を兼ねて、60℃の過マンガン酸カリウムのアルカリ水溶液(40g/L過マンガン酸カリウム+20g/L水酸化ナトリウム)を用いて、3分ほど処理を行った。
ニッケルの厚さは5μm、金の厚さは0.1μmであった(図示せず)。
2・・・フォトレジストパターン、
3・・・孔部、
4・・・溝部、
5・・・プリモールド樹脂、
6・・・平板プレス板、
7・・・リードフレーム基板、
8・・・半導体素子搭載部、
9・・・半導体素子電極接続端子、
10・・・配線、
11・・・外部接続端子、
12・・・外枠部、
13・・・半導体素子、
14・・・金線、
15・・・ダイアタッチ材、
16・・・トランスファーモールド樹脂、
17・・・電着ポリイミド層
Claims (4)
- 金属板の第1の面に、半導体素子を搭載する半導体素子搭載部、前記半導体素子の電極と接続する為の半導体素子電極接続端子、及び第1の外枠部を、それぞれ形成する為のフォトレジストのパターンを形成し、
前記金属板の第2の面には、外部接続端子、第2の外枠部、及び前記第2の外枠部の少なくとも一部に溝部を、それぞれ形成する為のフォトレジストのパターンを形成し、
前記第2の面の金属板が露出した金属板露出部に、前記金属板露出部を貫通しない孔部と、前記第2の外枠部の内側から外側へ横断する溝部を、エッチングにより形成し、
前記孔部と前記溝部に、プリモールド樹脂を平板プレスにて加熱・加圧塗布することによって樹脂層を形成し、
前記第1の面をエッチングすることにより、前記半導体素子搭載部、前記外部接続端子と電気的に接続される前記半導体素子電極接続端子、及び前記第1の外枠部を形成することを特徴とするリードフレーム基板の製造方法。 - 前記第2の面の前記金属板露出部に前記孔部と前記溝部を形成した後、エッチングされた表面に粗化処理を施すことを特徴とする請求項1に記載のリードフレーム基板の製造方法。
- 第1の面と第2の面とを有する金属板と、
前記第1の面に形成され、半導体素子を搭載する半導体素子搭載部と、
前記第1の面に形成され、前記半導体素子の電極と接続する為の半導体素子電極接続端子と、
前記第1の面に形成された第1の外枠部と、
前記第2の面に形成され、前記半導体素子電極接続端子と電気的に接続された外部接続端子と、
前記第2の面に形成された樹脂層と、
前記第2の面に形成され、前記第1の外枠部と一体成形された第2の外枠部と、
前記第2の面の側の少なくとも一部に設けられ、前記第2の外枠部を内側から外側に横断する溝部と、
前記第2の面の側に設けられ、前記樹脂層が充填され、前記金属板を貫通しない孔部と、
を備えることを特徴とするリードフレーム基板。 - 前記孔部は、表面が粗化されていることを特徴とする請求項3に記載のリードフレーム基板。
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US13/064,314 US8304294B2 (en) | 2008-09-30 | 2011-03-17 | Lead frame substrate and method of manufacturing the same |
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JP6863846B2 (ja) * | 2017-07-19 | 2021-04-21 | 大口マテリアル株式会社 | 半導体素子搭載用基板及びその製造方法 |
JP7164804B2 (ja) * | 2018-06-25 | 2022-11-02 | 日亜化学工業株式会社 | パッケージ、発光装置およびそれらの製造方法 |
JP7510612B2 (ja) * | 2020-03-18 | 2024-07-04 | 大日本印刷株式会社 | リードフレーム、リードフレームの製造方法及び半導体装置の製造方法 |
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US8304294B2 (en) | 2012-11-06 |
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CN102165586B (zh) | 2014-06-04 |
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