JP5549066B2 - リードフレーム型基板とその製造方法、及び半導体装置 - Google Patents
リードフレーム型基板とその製造方法、及び半導体装置 Download PDFInfo
- Publication number
- JP5549066B2 JP5549066B2 JP2008254312A JP2008254312A JP5549066B2 JP 5549066 B2 JP5549066 B2 JP 5549066B2 JP 2008254312 A JP2008254312 A JP 2008254312A JP 2008254312 A JP2008254312 A JP 2008254312A JP 5549066 B2 JP5549066 B2 JP 5549066B2
- Authority
- JP
- Japan
- Prior art keywords
- connection terminal
- semiconductor element
- lead frame
- external connection
- metal plate
- 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
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- 239000000758 substrate Substances 0.000 title claims description 37
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 31
- 239000011347 resin Substances 0.000 claims description 30
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- 238000005530 etching Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 17
- 229920002120 photoresistant polymer Polymers 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 6
- 238000013007 heat curing Methods 0.000 claims description 2
- 238000007639 printing Methods 0.000 description 10
- 238000007747 plating Methods 0.000 description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
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- 238000005452 bending Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
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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
- 239000004642 Polyimide Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
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- MSNOMDLPLDYDME-UHFFFAOYSA-N gold nickel Chemical compound [Ni].[Au] MSNOMDLPLDYDME-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 239000012286 potassium permanganate Substances 0.000 description 2
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- 230000008646 thermal stress Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 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
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Lead Frames For Integrated Circuits (AREA)
- Die Bonding (AREA)
Description
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。
そして近年、半導体素子の電極数が次第に増加するにつれて、アウターリードを側面に有するリードフレームタイプの半導体パッケージでは、もはや端子数が対応しきれなくなり、一部、BGA(Ball Grid Aray)やLGA(Land Grid Aray)タイプ等プリント配線基板との外部接続端子がパッケージ基板底面でアレイ状に配置された半導体パッケージへ置き換わってきている。
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11の数が増加すると、半導体素子電極接続端子9側の配線10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、特許文献1の技術によると、本構造のリードフレーム基板に半導体素子を搭載し、ワイヤーボンディングにより半導体素子電極接続端子9を接続する際、接続端子9の下部は中空になっているため、ワイヤー接続の力が掛からず、接続不良が発生し、組み立て収率を著しく落とすという問題点があった。
このため、印刷技術を用いて第2の面に一定量プリモールド樹脂を塗布すると、比較的均一に樹脂層が形成される。外部接続端子上にも樹脂層が形成されるが、均一な膜厚のために除去工程が容易になると推察される。
図6(c)は印刷後、熱硬化させた外部接続端子近傍の樹脂層の状態を示してる。図中に模式的に示すように、印刷方向(矢印で示す)に対して外部接続端子を越えた先に気泡が形成されてしまう問題点が心配される。
樹脂層に埋設された前記外部接続端子の側面には、前記外部接続端子の側上部から側底部にかけて幅30μm以下、長さ100μm以下である1箇所以上の突出部があり、前記突出部は前記第2の面に残らないように設けてあること、を特徴とするリードフレーム型基板である。
前記第2の面の金属板が露出した金属板露出部に、貫通しない孔部をエッチングにより形成すると同時に前記外部接続端子の側上部から側底部にかけて1箇所以上の突出部を形成し、前記突出部は幅30μm以下、長さ100μm以下であり、かつ前記第2の面に残らないように形成し、
前記孔部に、前記外部接続端子から突出部の方向へ液状プリモールド樹脂を塗布したうえ、加熱硬化することにより樹脂層を形成し、
その後、前記第1の面をエッチングすることにより、前記の半導体素子搭載部、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、及び外枠部を形成すること、
以上の工程を経ることを特徴とするリードフレーム型基板の製造方法である。
一方、本基板作製時において、配線の折れや曲がり、さらには気泡混入の不良が発生せず、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。
リードフレームに用いられる金属板1の両面に、フォトレジストのパターン2を形成する(図1(b))。図1では上面に、半導体素子搭載部8、半導体素子電極との接続端子9、配線10、外枠部12のパターンを、下面に、外部接続端子11、外枠部のパターンを形成する。
このフォトレジストで出来た突起部13のパターンは、その後のエッチングで第2の金属面は残らないように設計する。
突起部13のパターンは、幅を30μm以下、長さを100μm以下に設定するのが一般に良い。但し、孔部3を形成するエッチング条件、エッチング量によって影響され、エッチング後に残った金属部分の大きさと形状が変化するので、それを考慮してフォトレジストパターンの突起部13のサイズを最適化しておく必要がある。
塩化第二鉄液等、金属板を溶解するエッチング液を用いて下面からエッチングを行い、孔部3を形成する(図1(c))。孔部3の深さは金属板の残存部が最終的に配線になるため、第2回目の上面側からのエッチング時に微細配線が形成できるように10から50μm厚程度残すことが好ましい。
図2(c)は、図2(b)のA−B間の断面を示すが、突出部14は第2の面よりも低く形成される。図2(b)は突出部14が一箇所、図2(d)は二箇所形成された状態を示す。
塗工は印刷技術を応用する事が、生産性や品質の面から一般に好ましい。印刷方法としては、適宜に厚く塗工できればどのような方法でも構わないが、一般にスクリーン印刷が好ましい。印刷の方向は、図2(b)、図(d)の矢印の方向に行うことにより、プリモールド樹脂の流れに方向性を持たせ、気泡の巻き込みを防止することができる。塗工後にプリモールド樹脂を加熱硬化させる(図1(e))。
さらに、反対の面をエッチングして、半導体搭載部8、半導体素子電極接続端子9、配線10を形成してリードフレーム型基板7を得た(図1(f))。外部接続端子側の上面図を図3に示す。外部接続端子をアレイ状に配置することができ、半導体素子の多ピン化に対応が可能となった。
ダイアタッチ材17により半導体素子15を貼り付け、金線16で半導体素子電極接続端子9と接続する。必要に応じて、半導体素子電極接続端子には、適宜、ニッケルー金めっき、錫めっき、銀めっき、又は(?)ニッケル−パラジウム−金めっき、等のいずれかを施す。
尚、ワイヤーボンディングを行う際、本リードフレーム型基板をヒートブロックの上に載せ、加熱しながら接合を行うが、半導体素子電極接続端子9の下部にプリモールド樹脂が面一で存在し、また(前記)中空構造が出来にくい難い為に、接合不良を起こさず組み立てることができる。
BGAタイプであればはんだボールを外部接続端子に搭載して、リードフレーム型基板を用いた半導体パッケージが得られる。
製造したBGAのパッケージサイズは10mm角で、パッケージ下面には168ピンのアレイ状の外部接続端子を持つものである。
次いで、図1(b)に示すように、この金属板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°Cでプレベークを行った。
次に、所望のパターンを有するフオ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1(b)に示すようにフォトレジストパターン2を得た。
さらに、180°C、3時間で硬化を行い、プリモールド層13を形成した。熱硬化樹脂の埋め込み性は良好で、気泡を含め不良は観察されなかった。
尚、図示していないが、下面側に不要なエッチングが行われないよう、第2回目のエッチング処理時には第2の面側にバックシート等を貼り付けておくのが好ましい。
次に、レジストの剥離後、露出した金属面に対し、電解ニッケル−金めっきを施した。ニッケルの厚さは5μm、金の厚さは0.1μmであった(図示せず)。
ワイヤーボンディングの加熱温度は200°Cで行い、半導体素子電極接続端子側のワイヤーのプル強度を測定したところ、9g以上あり、良好な接続が得られた。
2 フォトレジストパターン
3 孔部
4 スキージ
5 液状プリモールド樹脂
6 樹脂層
7 リードフレーム型基板
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 フォトレジスト突起パターン
14 突出部
15 半導体素子
16 金線
17 ダイアタッチ材
18 トランスファーモールド樹脂
19 気泡
Claims (3)
- 金属板の第1の面に、半導体素子搭載部、半導体素子電極接続端子、および外枠部を有し、該金属板の第2の面には、該半導体素子電極接続端子と電気的に接続した外部接続端子、および外枠部を有しており、これらの間隙に樹脂層が形成されているリードフレーム型基板であって、
前記樹脂層に埋設された前記外部接続端子の側面には、前記外部接続端子の側上部から側底部にかけて幅30μm以下、長さ100μm以下である1箇所以上の突出部があり、前記突出部は前記第2の面に残らないように設けてあること、
を特徴とするリードフレーム型基板。 - 金属板の第1の面に、半導体素子搭載部、半導体素子電極接続端子、および外枠部を、又、該金属板の第2の面には、該半導体素子電極接続端子と接続される外部接続端子、及び外枠部を、それぞれ形成する為のフォトレジストパターンを形成し、特に該外部接続端子の形成の為の該フォトレジストパターンは一箇所以上の突起状のパターンを有するように形成し、
前記第2の面の金属板が露出した金属板露出部に、貫通しない孔部をエッチングにより形成すると同時に前記外部接続端子の側上部から側底部にかけて1箇所以上の突出部を形成し、前記突出部は幅30μm以下、長さ100μm以下であり、かつ前記第2の面に残らないように形成し、
前記孔部に、前記外部接続端子から突出部の方向へ液状プリモールド樹脂を塗布したうえ、加熱硬化することにより樹脂層を形成し、
その後、前記第1の面をエッチングすることにより、前記の半導体素子搭載部、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、及び外枠部を形成すること、
以上の工程を経ることを特徴とするリードフレーム型基板の製造方法。 - 請求項1に記載のリードフレーム型基板に、半導体素子が搭載され、且つ、ワイヤーボンディングで該リードフレーム型基板と該半導体素子との電気的接続が成されていること、を特徴とする半導体装置。
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JP2008254312A JP5549066B2 (ja) | 2008-09-30 | 2008-09-30 | リードフレーム型基板とその製造方法、及び半導体装置 |
TW098132930A TWI502711B (zh) | 2008-09-30 | 2009-09-29 | 導線架基板及其製造方法與半導體裝置 |
KR1020117006885A KR101602982B1 (ko) | 2008-09-30 | 2009-09-30 | 리드 프레임 기판과 그 제조 방법, 및 반도체 장치 |
PCT/JP2009/005041 WO2010038452A1 (ja) | 2008-09-30 | 2009-09-30 | リードフレーム基板とその製造方法、及び半導体装置 |
CN200980138144.0A CN102165585B (zh) | 2008-09-30 | 2009-09-30 | 引线框基板及其制造方法、半导体器件 |
US13/064,205 US8558363B2 (en) | 2008-09-30 | 2011-03-10 | Lead frame substrate and method of manufacturing the same, and semiconductor device |
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TWI427716B (zh) * | 2010-06-04 | 2014-02-21 | 矽品精密工業股份有限公司 | 無載具之半導體封裝件及其製法 |
US8673689B2 (en) * | 2011-01-28 | 2014-03-18 | Marvell World Trade Ltd. | Single layer BGA substrate process |
CN102244060B (zh) * | 2011-06-02 | 2013-09-25 | 日月光半导体制造股份有限公司 | 封装基板及其制造方法 |
US8916421B2 (en) * | 2011-08-31 | 2014-12-23 | Freescale Semiconductor, Inc. | Semiconductor device packaging having pre-encapsulation through via formation using lead frames with attached signal conduits |
US9142502B2 (en) * | 2011-08-31 | 2015-09-22 | Zhiwei Gong | Semiconductor device packaging having pre-encapsulation through via formation using drop-in signal conduits |
US8597983B2 (en) | 2011-11-18 | 2013-12-03 | Freescale Semiconductor, Inc. | Semiconductor device packaging having substrate with pre-encapsulation through via formation |
JP2014072242A (ja) | 2012-09-27 | 2014-04-21 | Rohm Co Ltd | チップ部品およびその製造方法 |
KR101505088B1 (ko) * | 2013-10-22 | 2015-03-23 | 앰코 테크놀로지 코리아 주식회사 | 반도체 패키지와 리드프레임 패들 구조 및 방법 |
JP6266351B2 (ja) * | 2014-01-08 | 2018-01-24 | 新日本無線株式会社 | センサ装置およびその製造方法 |
JP7182374B2 (ja) * | 2017-05-15 | 2022-12-02 | 新光電気工業株式会社 | リードフレーム及びその製造方法 |
JP7039245B2 (ja) * | 2017-10-18 | 2022-03-22 | 新光電気工業株式会社 | リードフレーム及びその製造方法と電子部品装置 |
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- 2009-09-30 WO PCT/JP2009/005041 patent/WO2010038452A1/ja active Application Filing
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CN102165585B (zh) | 2014-03-26 |
TWI502711B (zh) | 2015-10-01 |
US20110163435A1 (en) | 2011-07-07 |
US8558363B2 (en) | 2013-10-15 |
KR101602982B1 (ko) | 2016-03-11 |
WO2010038452A1 (ja) | 2010-04-08 |
KR20110074514A (ko) | 2011-06-30 |
CN102165585A (zh) | 2011-08-24 |
JP2010087221A (ja) | 2010-04-15 |
TW201021186A (en) | 2010-06-01 |
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