JP2007081235A - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 60
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 238000007747 plating Methods 0.000 claims abstract description 75
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 238000002844 melting Methods 0.000 claims abstract description 20
- 230000008018 melting Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 28
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 10
- 229910052718 tin Inorganic materials 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 239000000758 substrate Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910020816 Sn Pb Inorganic materials 0.000 description 2
- 229910020830 Sn-Bi Inorganic materials 0.000 description 2
- 229910020922 Sn-Pb Inorganic materials 0.000 description 2
- 229910018728 Sn—Bi Inorganic materials 0.000 description 2
- 229910008783 Sn—Pb Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001304 sample melting Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
- H01L23/49579—Lead-frames or other flat leads characterised by the materials of the lead frames or layers thereon
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- 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 subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4821—Flat leads, e.g. lead frames with or without insulating supports
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- 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
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- 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
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Abstract
【解決手段】 外部接続用リードをFeとNiの合金(42Alloy)で形成し、その表面に、SnとCuの合金からなる外装めっき膜を形成する。次に、熱処理炉12を用いて、外装めっき膜の融点T0以上の温度で熱処理し、外装めっき膜を溶融させる。このとき、T0以上の温度が20秒以上保持されるようにする。上記熱処理により、外装めっき膜の粒界を消失させることができる。これにより、外装めっき膜の内部応力を緩和させ、ウィスカの発生を抑制することができる。
【選択図】 図9
Description
本実施の形態に係る半導体装置の製造方法について説明する。まず、図示しないが、ウェハの主面上にトランジスタなどの素子を形成する。次に、ウェハをダイシングして、半導体チップごとに切断する。図1は、上記半導体チップを搭載して、半導体パッケージを形成するためのリードフレーム1の平面図である。リードフレーム1は、Fe(鉄)とNi(ニッケル)からなり、Niが42%(重量%)含まれた合金(42Alloy)を用いて形成されている。(通常、リードフレームは、アレイ状に複数個が連なっているが、ここでは1つのリードフレームのみを示す。)リードフレーム1の中央部に、ダイパッド2が設けられている。リードフレーム1の外周に沿って、複数のリード3が設けられている。ダイパッド2とリード3との間には、タイバー4が設けられている。リード3を囲むようにフレーム枠5が設けられ、リード3を支持している。リードフレーム1の四隅には、吊りリード6が設けられ、ダイパッド2とフレーム枠5とを接続している。
本実施の形態に係る半導体装置の製造方法について説明する。本実施の形態では、実施の形態1と異なる点を中心に説明する。まず、実施の形態1と同様に、ウェハの主面上にトランジスタなどの素子を形成する工程から、外部接続用リード3aを成形するまでの工程(図7参照)を、実施の形態1と同様にして行う。
Claims (8)
- 外部接続用リードの表面にSnを含むめっき膜を形成する工程と、
前記めっき膜を溶融する熱処理工程とを有し、
前記熱処理工程は、前記めっき膜の融点以上の温度を20秒以上保持することを特徴とする半導体装置の製造方法。 - 外部接続用リードの表面にSnを含むめっき膜を形成する工程と、
前記めっき膜を溶融する熱処理工程とを有し、
前記熱処理工程は、前記めっき膜の表面に形成された酸化膜が破壊されるまで溶融状態を維持することを特徴とする半導体装置の製造方法。 - 前記熱処理工程の最大温度は、半導体装置の耐熱保証温度以下であることを特徴とする請求項1又は2に記載の半導体装置の製造方法。
- 前記熱処理工程は、前記外部接続用リードの外部機器に接続される面が下向きとした状態で行われることを特徴とする請求項1〜3のいずれかに記載の半導体装置の製造方法。
- 前記熱処理工程は、不活性雰囲気中で行われることを特徴とする請求項1〜4のいずれかに記載の半導体装置の製造方法。
- 前記めっき膜を形成する工程の後、前記熱処理工程を行う前に、前記リード端子の成形工程を行うことを特徴とする請求項1〜5のいずれかに記載の半導体装置の製造方法。
- 前記熱処理工程の後に、前記外装めっき膜に端子を接触させて電気特性試験を行うことを特徴とする請求項6に記載の半導体装置の製造方法。
- 前記リード端子の成形工程の後、前記熱処理工程の前に、前記外装めっき膜に端子を接触させて電気特性試験を行うことを特徴とする請求項6に記載の半導体装置の製造方法。
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JP2005268904A JP2007081235A (ja) | 2005-09-15 | 2005-09-15 | 半導体装置の製造方法 |
US11/362,847 US7547581B2 (en) | 2005-09-15 | 2006-02-28 | Manufacturing method of a semiconductor device to suppress generation of whiskers |
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JPH02274852A (ja) * | 1989-04-17 | 1990-11-09 | Nec Corp | 錫めっきのウィスカ対策方法 |
JPH03234049A (ja) * | 1990-02-09 | 1991-10-18 | Fujitsu Ltd | 半導体パッケージ外部端子の表面処理方法 |
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