JP7182374B2 - リードフレーム及びその製造方法 - Google Patents
リードフレーム及びその製造方法 Download PDFInfo
- Publication number
- JP7182374B2 JP7182374B2 JP2018083832A JP2018083832A JP7182374B2 JP 7182374 B2 JP7182374 B2 JP 7182374B2 JP 2018083832 A JP2018083832 A JP 2018083832A JP 2018083832 A JP2018083832 A JP 2018083832A JP 7182374 B2 JP7182374 B2 JP 7182374B2
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- Prior art keywords
- lead
- external connection
- connection terminal
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- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 38
- 229910052751 metal Inorganic materials 0.000 claims description 86
- 239000002184 metal Substances 0.000 claims description 86
- 238000005530 etching Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000059 patterning Methods 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 22
- 238000007789 sealing Methods 0.000 description 14
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 239000013256 coordination polymer Substances 0.000 description 7
- WABPQHHGFIMREM-NOHWODKXSA-N lead-200 Chemical compound [200Pb] WABPQHHGFIMREM-NOHWODKXSA-N 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
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- H01L24/85—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 wire connector
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- H01L2924/1815—Shape
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Description
図5~図10は実施形態のリードフレームを説明するための図、図11~図22は実施形態のリードフレームの製造方法を説明するための図である。
Claims (14)
- 枠部と、
前記枠部から内側に延在し、表面と裏面とを有するリードと、
前記リードの延在方向の一部分に形成され、前記リードの裏面から突出する外部接続端子と
を有し、
前記枠部、前記リード及び前記外部接続端子は単一の金属から構成され、
前記リードは、前記外部接続端子よりも前記枠部の内側に、前記リードの表面を上側に向けた断面視で、本体部と、前記本体部の下面から突出する突出部とを有し、
前記突出部は、前記リードの幅方向の中央部に設けられるとともに、前記リードの延在方向に延び、
前記突出部と前記外部接続端子とは、連結部を介して繋がっており、
前記連結部の幅は、前記突出部の幅よりも大きく、かつ前記外部接続端子の幅よりも小さく、
前記連結部は、前記突出部及び前記外部接続端子に繋がる2つの曲面を有し、
前記2つの曲面の間の距離は、前記突出部側から前記外部接続端子側にかけて大きくなり、
前記外部接続端子は、前記リードの延在方向の中間に配置され、
前記突出部は、前記枠部と前記外部接続端子との間の領域の前記リードにも形成されていることを特徴とするリードフレーム。 - 前記本体部の断面形状が四角状であり、前記突出部の断面形状が三角状であり、前記リードの断面形状が五角状であり、
前記本体部の下端の幅が上端の幅よりも小さいことを特徴とする請求項1に記載のリードフレーム。 - 前記連結部の高さは、前記突出部の高さよりも高く、かつ前記外部接続端子の高さよりも低く、
前記曲面の高さは、前記突出部側から前記外部接続端子側にかけて高くなることを特徴とする請求項1又は2に記載のリードフレーム。 - 前記外部接続端子の厚みは、前記リードの前記突出部が設けられた部分の厚みよりも厚いことを特徴とする請求項1乃至3のいずれか1項に記載のリードフレーム。
- 前記外部接続端子の厚みは、前記枠部の厚みと等しいことを特徴とする請求項1乃至4のいずれか1項に記載のリードフレーム。
- 前記リードは、前記枠部に接続された端部とは反対側の端部に、前記リードの表面にワイヤが接続されるワイヤボンディング部を有し、
前記ワイヤボンディング部は前記突出部を有さず、
前記ワイヤボンディング部の裏面は平坦であることを特徴とする請求項1乃至5のいずれか1項に記載のリードフレーム。 - 単一の金属から構成された金属板を用意する工程と、
前記金属板をエッチング加工することにより、枠部と、前記枠部から内側に延在し、表面と裏面とを有するリードと、前記リードの延在方向の一部分に配置され、前記リードの裏面から突出する外部接続端子とを形成する工程と
を有し、
前記枠部と、前記リードと、前記外部接続端子とを形成する工程において、前記リードに、前記外部接続端子よりも前記枠部の内側において、前記リードの表面を上側に向けた断面視で、本体部と、前記本体部の下面から突出する突出部と、前記突出部と前記外部接続端子とを繋ぐ連結部とを形成し、
前記突出部は、前記リードの幅方向の中央部に設けられるとともに、前記リードの延在方向に延び、
前記連結部の幅は、前記突出部の幅よりも大きく、かつ前記外部接続端子の幅よりも小さく、
前記連結部は、前記突出部及び前記外部接続端子に繋がる2つの曲面を有し、
前記2つの曲面の間の距離は、前記突出部側から前記外部接続端子側にかけて大きくなり、
前記外部接続端子は、前記リードの延在方向の中間に配置され、
前記突出部は、前記枠部と前記外部接続端子との間の領域の前記リードにも形成されることを特徴とするリードフレームの製造方法。 - 前記本体部の断面形状が四角状であり、前記突出部の断面形状が三角状であり、前記リードの断面形状が五角状であり、
前記本体部の下端の幅が上端の幅よりも小さいことを特徴とする請求項7に記載のリードフレームの製造方法。 - 前記枠部と、前記リードと、前記外部接続端子とを形成する工程は、
前記金属板の表面に、前記枠部と前記リードと前記外部接続端子とに対応する第1レジスト層をパターニングすると共に、前記金属板の裏面に、前記枠部と前記外部接続端子とに対応する主パターンと、前記リードの突出部に対応する補助パターンとを備えた第2レジスト層をパターニングする工程と、
前記第1レジスト層及び前記第2レジスト層の各開口領域を通して、前記金属板を表面側及び裏面側からエッチングする工程と
を有し、
前記リードは前記金属板が裏面側からハーフエッチングされて得られ、前記枠部と前記外部接続端子とは前記金属板が表面側及び裏面側から貫通加工されて得られることを特徴とする請求項7又は8に記載のリードフレームの製造方法。 - 前記第2レジスト層の補助パターンに複数の孔部が配置されていることを特徴とする請求項9に記載のリードフレームの製造方法。
- 前記枠部と、前記リードと、前記外部接続端子とを形成する工程において、
前記連結部の高さは、前記突出部の高さよりも高く、かつ前記外部接続端子の高さよりも低く設定され、
前記曲面の高さは、前記突出部側から前記外部接続端子側にかけて高くなることを特徴とする請求項7乃至10のいずれか一項に記載のリードフレームの製造方法。 - 前記外部接続端子の厚みは、前記リードの前記突出部が設けられた部分の厚みよりも厚いことを特徴とする請求項7乃至11のいずれか1項に記載のリードフレームの製造方法。
- 前記外部接続端子の厚みは、前記枠部の厚みと等しいことを特徴とする請求項7乃至12のいずれか1項に記載のリードフレームの製造方法。
- 前記リードは、前記枠部に接続された端部とは反対側の端部に、前記リードの表面にワイヤが接続されるワイヤボンディング部を有し、
前記ワイヤボンディング部は前記突出部を有さず、
前記ワイヤボンディング部の裏面は平坦であることを特徴とする請求項7乃至13のいずれか1項に記載のリードフレームの製造方法。
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