JP5369682B2 - フォームはんだおよび電子部品 - Google Patents
フォームはんだおよび電子部品 Download PDFInfo
- Publication number
- JP5369682B2 JP5369682B2 JP2008513254A JP2008513254A JP5369682B2 JP 5369682 B2 JP5369682 B2 JP 5369682B2 JP 2008513254 A JP2008513254 A JP 2008513254A JP 2008513254 A JP2008513254 A JP 2008513254A JP 5369682 B2 JP5369682 B2 JP 5369682B2
- Authority
- JP
- Japan
- Prior art keywords
- solder
- metal particles
- foam
- semiconductor element
- metal
- 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.)
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- 229910000679 solder Inorganic materials 0.000 title claims description 191
- 239000006260 foam Substances 0.000 title description 71
- 239000002923 metal particle Substances 0.000 claims description 64
- 229910045601 alloy Inorganic materials 0.000 claims description 45
- 239000000956 alloy Substances 0.000 claims description 45
- 239000002245 particle Substances 0.000 claims description 45
- 239000004065 semiconductor Substances 0.000 claims description 43
- 239000000758 substrate Substances 0.000 claims description 35
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 239000003870 refractory metal Substances 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 229910052718 tin Inorganic materials 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 description 35
- 229910052751 metal Inorganic materials 0.000 description 35
- 230000004907 flux Effects 0.000 description 22
- 238000000034 method Methods 0.000 description 18
- 238000005476 soldering Methods 0.000 description 13
- 239000010949 copper Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910000765 intermetallic Inorganic materials 0.000 description 8
- 239000011800 void material Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 5
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 5
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 5
- 239000012190 activator Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 229910017482 Cu 6 Sn 5 Inorganic materials 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 3
- 235000011613 Pinus brutia Nutrition 0.000 description 3
- 241000018646 Pinus brutia Species 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229910018104 Ni-P Inorganic materials 0.000 description 2
- 229910018536 Ni—P Inorganic materials 0.000 description 2
- 239000004840 adhesive resin Substances 0.000 description 2
- 229920006223 adhesive resin Polymers 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- GGSUCNLOZRCGPQ-UHFFFAOYSA-N diethylaniline Chemical compound CCN(CC)C1=CC=CC=C1 GGSUCNLOZRCGPQ-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 description 1
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- 229910017937 Ag-Ni Inorganic materials 0.000 description 1
- 229910017984 Ag—Ni Inorganic materials 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002482 Cu–Ni Inorganic materials 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910020882 Sn-Cu-Ni Inorganic materials 0.000 description 1
- 229910020935 Sn-Sb Inorganic materials 0.000 description 1
- 229910008757 Sn—Sb Inorganic materials 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 description 1
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3478—Applying solder preforms; Transferring prefabricated solder patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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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
- 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
- H01L23/492—Bases or plates or solder therefor
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- H01L24/01—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
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- H01L2224/29109—Indium [In] as principal constituent
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- H01L2224/291—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
- H01L2224/29101—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 less than 400°C
- H01L2224/29111—Tin [Sn] as principal constituent
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- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29199—Material of the matrix
- H01L2224/292—Material of the matrix 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
- H01L2224/29201—Material of the matrix 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 less than 400°C
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Description
特許文献3は、金属粒が混在した複合はんだインゴットの製造方法を開示するが、この方法では、金属粒とフラックスを一緒に練ったものを溶融はんだ中に投入して攪拌、冷却、固化する。ここで用いる金属粒の粒径は、20μm、50μm、100μmである。
図3に示すように特許文献1のフォームはんだ30は、金属粒の大きさが定まっていないため、半導体素子31と基板32を接合して電子部品33(図4)にしたときに小さな金属粒(図中の三角型)の方が低くなり、大きな金属粒子(図中の大きな丸型や四角型)の方が高くなる。さらに特許文献1のフォームはんだをミクロ的に見ると、金属粒34とシート状はんだ35との間は、単なる接触状態、即ち金属粒34の周囲には空気36が存在している状態となっている。
特許文献3の方法により得られたフォームはんだは、金属粒とフラックスが混合されたものを溶融はんだ中に投入するため、金属粒は溶融金属と金属的に接合していて、ローラーを用いた製造方法よりもボイドは少ない。しかしながら特許文献3の製造方法で得られたフォームはんだでも、ボイドが発生して半導体素子を傾斜させたり、接合強度を弱めたりすることがあった。その原因は、金属粒の周囲にフラックスが付着していることが考えられる。
特許文献3のフォームはんだ50では、図7に示すように、金属粒51に微小な固体または液体のフラックス52が付着している。そのため、このフォームはんだを半導体素子53と基板54間に挟んで加熱・溶融して電子部品55にすると、微小なフラックスは温度の上昇にともない気化して体積が増大し、図8に示すように大きなボイド56となる。その結果、大きなボイドが半導体素子53を持ち上げるようになる。その後、はんだを固化するためにはんだ付け部は冷却されるが、はんだが急速に固化してしまうため、ボイドは小さくならずに体積が増大したままとなって残る。従って、ボイドの体積が増大した部分は高さが高くなって傾斜してしまう。
また従来のフォームはんだで半導体素子と基板をはんだ付けしたときに、はんだ付け部に衝撃が加わっただけで容易に剥離するのは、金属粒とはんだとが金属的に接合していないことと、金属粒の周囲に発生したボイドに原因がある。つまり金属粒とはんだとが金属的に接合していないと、この部分の接合強度が弱まるからであり、また金属粒の周囲に少しでも空気やフラックスが存在すると、加熱時にこれらが大きなボイドとなり、接合面積が小さくなるからである。ボイドの発生で接合面積が小さくなるのは、近時の半導体素子は小型化されてきていることから、はんだ付け面積も小さくなっており、この小さなはんだ付け面積に対してはボイドの占める割合が大きくなるため、はんだ付け面積が小さくなって接合強度が弱くなるからである。
さらに、本発明は、板状はんだ中に平均粒径20〜300μm の高融点金属粒であるCuが分散された、Sn主成分の鉛フリーフォームはんだにおいて、高融点金属粒の粒子径のバラツキが20μm以下であり、しかも高融点金属粒の周囲には、はんだの主成分と高融点金属粒との合金層が形成されており、該合金層がCu 3 Sn、Cu 6 Sn 5 から成る群から選んだ少なくとも1種の合金層であることを特徴とする鉛フリーフォームはんだである。
本発明にかかるフォームはんだにおいて、高融点金属粒とはんだの接合面には空気やフラックスの巻き込みあるいは残留が見られないから、はんだ付けを行った後でも接合部にはボイドが全く存在しない。
図1は本発明のフォームはんだの模式的断面図であり、図2は本発明のフォームはんだを使ってはんだ付けした半導体素子と基板とからなる電子部品の模式的部分断面図である。
先ず、実際にはんだ中に分散させる量よりも多い量の金属粒を熱分解可能な液状フラックスと混合して混合物にする。得られた混合物を溶融はんだ中に投入し、攪拌後、急冷して混合母合金にする。この混合母合金を所定量計量し、これを溶融はんだ中に投入して攪拌後、鋳型に鋳込み、急冷してビレットにする。次いで、このビレットを押出機で押し出して帯状材にし、得られた帯状材を圧延機で圧延してリボン材にする。その後、このリボン材を所定の形状に打ち抜いて板状はんだ中に金属粒が多数分散されたフォームはんだにする。
活性剤(ジエチルアニリンHBr)10.0質量%
溶剤(エチレングリコールモノエチルエーテル) 30.0質量%
そして混合母合金を大量の溶融はんだ中に投入すれば、既に金属粒がはんだと金属的に接合されているため、該混合母合金は大量の溶融はんだ中に短時間で分散する。このとき混合母合金内に残っていたフラックスは、二度の溶解・攪拌により完全に除去される。その後、金属粒が均一分散した溶融はんだをビレット用鋳型に注入し、該鋳型を急冷することにより金属粒が均一分散されたビレットが得られる。
ここで本発明の実施例と比較例について説明する。
フォームはんだの製造方法:混合母合金法
金属粒:Ni(直径50μm、バラツキ10μm以内)
はんだ:Sn-0.7Cu-0.06Ni-0.005P
金属粒周囲の金属間化合物:Ni3Sn、Ni3Sn2、Ni3Sn4
はんだ付け方法:10×10×0.3(mm)の半導体素子を30×30×0.3(mm)の基板(ニッケルメッキした銅基板)にフォームはんだでダイボンディング接合を行った。すなわち、フォームはんだを半導体素子と基板間に挟み込み、酸素濃度が10ppmの窒素水素混合ガス雰囲気中で235℃以上に3分間、ピーク温度280℃、総リフロー時間15分間でリフローを行った。
フォームはんだの製造方法:混合母合金法
金属粒:Cu(直径50μm、バラツキ10μm以内)
はんだ:Sn-3Ag-0.5Cu
金属粒周囲の金属間化合物:Cu3Sn、Cu6Sn5
はんだ付け方法:実施例1と同一
(比較例1)
フォームはんだ:10×10×0.1(mm)
フォームはんだの製造方法:ローラー埋め込み法
金属粒:Ni(直径50μm、バラツキ30μm以上)
はんだ:Sn-0.7Cu-0.6Ni-0.05P
金属粒周囲の金属間化合物:なし
はんだ付け方法:実施例1と同一
実施例1、2と比較例1のフォームはんだで作った電子部品の接合部を透過X線装置でボイドの有無を観察したところ、実施例1、2のフォームはんだで作った電子部品にはボイドが皆無であったが、比較例1のフォームはんだで作った電子部品ではボイドが発生していた。このことから、本発明にかかるはんだフォームには空気の巻き込み・フラックスの残留は見られなかったことがわかる。
図9は、その結果を示すグラフである。実施例では500サイクルでもクラックは発生しなかったが、比較例では500サイクル時点でクラックが発生していた。また、3000サイクル時点でクラック率20%以下の目標に対し、実施例では10%以下のクラック率であり、バラツキも小さい。一方、比較例では12〜28%程度のクラック率でバラツキが大きく、目標も未達であった。
Claims (3)
- 板状はんだ中に高融点金属粒が分散された、Sn主成分の鉛フリーフォームはんだにおいて、前記金属粒が、Niであり、はんだ合金の融点+300℃以上の融点を有し、粒径20〜300μmであり、該高融点金属粒の粒子径のバラツキが粒子径の40%以内であり、かつ高融点金属粒の周囲には、はんだの主成分と高融点金属粒との合金層が形成されており、該合金層がNi3Sn、Ni3Sn2、 Ni 3 Sn 4 から成る群から選んだ少なくとも1種の合金層であることを特徴とする鉛フリーフォームはんだ。
- 板状はんだ中に高融点金属粒が分散された、Sn主成分の鉛フリーフォームはんだにおいて、前記金属粒が、Cuであり、はんだ合金の融点+300℃以上の融点を有し、粒径20〜300μmであり、該高融点金属粒の粒子径のバラツキが粒子径の40%以内であり、かつ高融点金属粒の周囲には、はんだの主成分と高融点金属粒との合金層が形成されており、該合金層がCu 3 Sn、Cu 6 Sn 5 から成る群から選んだ少なくとも1種の合金層であることを特徴とする鉛フリーフォームはんだ。
- 請求項1または2記載の鉛フリーフォームはんだを用いてはんだ付けされた、ボイドの発生がなく、最大厚さと最少厚さとのバラツキが金属粒径の40%以内の厚さのはんだ継手を備えた半導体素子と基板とからなることを特徴とする電子部品。
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US9824994B2 (en) | 2014-10-30 | 2017-11-21 | Toyota Jidosha Kabushiki Kaisha | Semiconductor device in which an electrode of a semiconductor element is joined to a joined member and methods of manufacturing the semiconductor device |
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DE112007001029T5 (de) | 2009-05-14 |
DE112007001029B4 (de) | 2014-07-17 |
US20090236725A1 (en) | 2009-09-24 |
CN101432095B (zh) | 2013-01-16 |
CN101432095A (zh) | 2009-05-13 |
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