JP2008311584A - 半導体パッケージの実装構造 - Google Patents
半導体パッケージの実装構造 Download PDFInfo
- Publication number
- JP2008311584A JP2008311584A JP2007160341A JP2007160341A JP2008311584A JP 2008311584 A JP2008311584 A JP 2008311584A JP 2007160341 A JP2007160341 A JP 2007160341A JP 2007160341 A JP2007160341 A JP 2007160341A JP 2008311584 A JP2008311584 A JP 2008311584A
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- Prior art keywords
- bump
- wiring board
- printed wiring
- mounting structure
- semiconductor chip
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- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
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Abstract
【解決手段】実装面3aとその反対側の面3bとを貫通するビア7を有するプリント配線板3と、ビア7の反対側面3bの開口部を閉塞するように反対側の面3bに形成されてビア7と導通するビアランド7aと、バンプ2を有する半導体チップ1と、半導体チップ1とプリント配線板3の実装面3aとのあいだに充填される熱硬化性接着剤9とを具備してなり、
ビア7に異方性導電材料8が充填されるとともに、ビア7にバンプ2が挿入され、導電性粒子8aによってバンプ2とビア7とが導通されていることを特徴とする半導体パッケージの実装構造11を提供する。
【選択図】図1
Description
例えば、BGA(Ball Grid Array)やCSP(Chip Size Package)などは、ビアを備えたプリント配線板上に半導体素子を実装し、この半導体素子とプリント配線板との間をワイヤーボンディングやバンプによって接続した後に、プリント配線板の実装面側を封止樹脂により封止した構造を有している。この場合、プリント配線板の実装面の反対側の面にビアを介して接続端子を設けることが可能なため、多ピン化に対応可能なパッケージとなっている。
プリント配線板3には、接続ランド4と、このランド4から引き出される配線パターン6aと、プリント配線板3の半導体チップ1の実装面3aとは反対側の面3bに形成された別の配線パターン6bと、6bに形成されたボール端子5と、配線パターン6aと配線パターン6bとを接続するビア7とが備えられている。
従来のフリップチップ実装構造10では、プリント配線板3の実装面3aの配線パターン6aが接続ランド4から引き出され、ビア7を介して、反対側の面3bでボール端子5まで配線パターン6bが引き回されるため、配線パターンの短縮化が図れないという問題がある。
しかしながら、従来の半導体パッケージでは、半導体チップの線膨張係数とプリント配線板の線膨張係数の違いにより生じる応力により接続部が破断する問題が解決されておらず、半導体パッケージの接続信頼性を満足する実装構造となっていないのが現状である。
本発明の半導体パッケージの実装構造は、実装面とその反対側の面とを貫通するビアを有するプリント配線板と、ビアの実装面と反対側の面の開口部を閉塞するようにプリント配線板の反対側の面に形成されてビアと導通するビアランドと、実装面に実装されるバンプを有する半導体チップと、半導体チップとプリント配線板の実装面とのあいだに充填される熱硬化性接着剤とを具備してなり、
ビアに導電性粒子と絶縁樹脂からなる異方性導電材料が充填されるとともに、ビアにバンプが挿入され、導電性粒子によってバンプとビアとが導通されていることを特徴とする。
また、半導体チップの線膨張係数とプリント配線板の線膨張係数の違いにより応力が生じるが、バンプとビアとが弾力性のある導電性粒子を介して接続されるため、接続部への応力は、導電性粒子によって緩和される。
さらに、低弾性率であって、半導体チップの線膨張係数とプリント配線板の線膨張係数とのあいだの線膨張係数を有する熱硬化性接着剤により、半導体チップとプリント配線板とが接合されるため、バンプとビアとの接続部への応力は熱硬化性接着剤によっても緩和される。
以上により、バンプとビアとの接続部が破断する問題が発生しない、接続信頼性の高い半導体パッケージの実装構造の提供が可能となる。
図1は、本発明の実施形態である半導体パッケージの断面図である。
図1に示すように、本実施形態の半導体パッケージの実装構造11は、半導体チップ1とプリント配線板3とが熱硬化性接着剤9によって固着されて、概略構成されている。
さらに、プリント配線板3に設けられたビア7の内部に、半導体チップ1のバンプ2が挿入され、バンプ2とビアランド7aとによって、ビア7に充填されている異方性導電材料8中の導電性粒子8aが挟まれて潰されている。そして導電性粒子8aを介して、バンプ2とビアランド7aとが導通される構造となっている。
バンプ2は、金属バンプが好ましく、半田バンプまたは金バンプがより好ましく、金スタッドバンプが特に好ましい。また、本実施形態では図1に示すように、バンプ2を後述するビア7内に挿入することから、バンプの先端を細く、バンプ高さを高く制御する必要があるため、画鋲形状となる金スタッドバンプの適用が好ましい。
例えば、ビア7の深さDが25μmであり、つぶれ量を5μm、スタンドオフ50μmとした場合には、バンプ2の高さHは80μmで形成することを例示することができる。
バンプ2の間隔(バンプピッチ)は、特に限定されないが、狭ピッチ(例えば0.4mm以下)であることが好ましい。0.4mmを超えるバンプピッチでは、従来の実装構造で対応可能となる。したがって、バンプピッチは0.4mm以下が好ましく、0.2mm以下がより好ましい。
これによりビア7の導体部7bおよびビアランド7aによって、プリント配線板3の実装面3aの配線パターン6aと、実装面の反対側の面3bの配線パターン6bとが導通されている。
ビア7の導体部7bおよびビアランド7aの材質として、Cu、Al、Au、Cr、Tiの金属が好ましく、Cuがより好ましい。
また、ビア径R2は、前述のバンプ径R1よりも大きいことが好ましく、30〜120μmの範囲であることがより好ましい。
異方性導電材料8は、後述する導電性粒子8aとバインダ樹脂である絶縁樹脂8bから構成されており、絶縁樹脂8bとしては、合成ゴム、熱可塑性樹脂、熱硬化性樹脂等が適用可能である。また、絶縁樹脂8bは、一般には、高Tg(ガラス転移温度)、低給水率、低線膨張係数等の特性が要求される。
さらに、本実施形態では、絶縁樹脂8bの線膨張係数が5〜30ppm/℃の範囲であることが好ましく、後述する熱硬化性接着剤9の線膨張係数と同程度であるとともに、半導体チップ1の線膨張係数とプリント配線板3の線膨張係数との間であることがより好ましい。
導電性粒子8aの粒子径は、3〜10μmの範囲であることが好ましい。導電性粒子8aの粒子径が大きいと、潰れ量が大きく、接続部への応力の緩和効果が大きいため好ましい。また、バンプ2の挿入により、ビア7内から導電性粒子8aがあふれた場合に隣接電極間で短絡が生じないように、導電性粒子8aの粒子径は、半導体チップ1とプリント配線板3との間の距離よりも小さいことが好ましい。
また、異方性導電材料8中の導電性粒子8aの含有率は、5〜15vol%の範囲であることが好ましい。異方性導電材料8中の導電性粒子8aの含有率が高いと、バンプ2とビア7との間で導電性粒子8aが潰される確率が高くなり、接続信頼性が高くなるため好ましい。
また、熱硬化性接着剤9は、低弾性率であることが好ましく、弾性率5GPa以下であることがより好ましい。
さらに、熱硬化性接着剤9の線膨張係数は、5〜30ppm/℃の範囲であることが好ましく、半導体チップ1の線膨張係数と、プリント配線板3の線膨張係数との間であることがより好ましい。
なお、熱硬化性接着剤9の線膨張係数と、異方性導電材料8中の絶縁樹脂8bとの線膨張係数とが同程度であることがより好ましい。熱硬化性接着剤9と異方性導電材料8とが一体となって、半導体チップ1とプリント配線板3の線膨張係数の違いにより生じる応力を緩和することが可能となり、バンプ2とビア7との接続部の信頼性が高い半導体パッケージの実装構造の提供ができる。
また、図2(B)に示すように、ビア7を構成する貫通孔7cの中心から少しずれた位置にバンプ2が挿入された場合では、バンプ2の先端部2aとビアランド7aとの間で導電性粒子8aが潰されるとともに、バンプ2の側面部2bとビア7の導体部7bとの間においても導電性粒子8aが潰されることで、良好に導通が確保される。
以上のように、本実施形態の半導体パッケージの実装構造では、半導体チップ1の実装時のアライメントずれ、および半導体チップ1のバンプ2とプリント配線板3のビア7とのピッチずれが生じた場合においても良好な導通を確保することが可能である。
尚、各図は、本実施形態の製造方法を説明するために、多数ある電極の内、1ピン部分のみを拡大して示したものであり、図示される各部の大きさや厚さや寸法等は、実際の半導体パッケージの実装構造の寸法関係とは異なる。
最初に、バンプ形成工程では、図3に示すように、半導体チップ1に設けられている電極パッド1a上に、バンプ2を形成する。
バンプ2の形成方法は、特に限定されないが、リソグラフィ手法を利用しためっき工法や、超音波及び加熱方式を用いることが可能である。
例えば、超音波及び加熱方式によれば、金スタッドバンプの形成が可能である。具体的には、金線の先端を電極によってスパークさせて金ボールを形成し、この金ボールを半導体チップ1の電極パッド1aに押し付ける。次に超音波振動を与えると、金ボールと電極パッド1aとの間に金属間化合物が形成される。この後、金線を引きちぎり、先端をレベリングすることで、高さが均一であり、先端が平滑である金スタッドバンプが得られる。
次に、図6に示すように、熱硬化性接着剤9を、ビア7の開口部を含むプリント配線板3の実装面3aに供給する。熱硬化性接着剤9として、ペースト状の樹脂のみならず、フィルム状の樹脂を用いることが可能である。具体的には、ペースト状の樹脂例としてNCP(Non Conductive Paste)や、フィルム上の樹脂としてNCF(Non Conductive Film)を用いることができる。
以上のようにして、図1に示すような、半導体パッケージの実装構造11が製造される。
また、半導体チップ1の線膨張係数とプリント配線板3の線膨張係数の違いにより応力が生じるが、バンプ2とビア7とが弾力性のある導電性粒子8aを介して接続されるため、バンプ2とビア7との接続部への応力は、導電性粒子8aによって緩和される。
また、低弾性率であって、半導体チップの線膨張係数とプリント配線板の線膨張係数とのあいだの線膨張係数を有する熱硬化性接着剤9により、半導体チップ1とプリント配線板3とが接合されるため、バンプ2とビア7との接続部への応力は、熱硬化性接着剤9によっても緩和される。
また、バンプ2とビア7の接続は、ビア7内へのバンプ2の挿入位置によらず、確実に導通を確保できる構造となっている。
以上により、バンプ2とビア7との接続部が破断するといった問題が発生しない、接続信頼性の高い半導体パッケージの実装構造11の提供が可能となる。
さらに、異方性導電材料8をビア7内のみに供給し、ビア7の開口部を熱硬化性接着剤9で被覆するため、バンプ2の圧着時に導電性粒子8aはビア7の外への流出することがあっても、被覆した熱硬化性接着剤9によって、導電性粒子8aが隣接端子間との短絡に至るまでの流出を抑制する。以上により、従来のACF接合やACP接合で問題となっていた導電性粒子8aによる隣接端子間の短絡の問題が生じないため、微細配線化にも対応可能な高密度化対応の半導体パッケージの実装構造11の提供が可能となる。
Claims (7)
- 実装面とその反対側の面とを貫通するビアを有するプリント配線板と、前記ビアの前記反対側の面の開口部を閉塞するように前記プリント配線板の前記反対側の面に形成されて前記ビアと導通するビアランドと、前記実装面に実装されるバンプを有する半導体チップと、前記半導体チップと前記プリント配線板の前記実装面とのあいだに充填される熱硬化性接着剤とを具備してなり、
前記ビアに導電性粒子と絶縁樹脂からなる異方性導電材料が充填されるとともに、前記ビアに前記バンプが挿入され、前記導電性粒子によって前記バンプと前記ビアとが導通されていることを特徴とする半導体パッケージの実装構造。 - 前記導電性粒子によって、前記バンプの先端部と、前記ビアランドとが導通されていることを特徴とする請求項1に記載の半導体パッケージの実装構造。
- 前記導電性粒子によって、前記バンプの側面部と、前記ビアの導体部とが導通されていることを特徴とする請求項1または請求項2に記載の半導体パッケージの実装構造。
- 前記バンプの側面部と、前記ビアの導体部とが接触して導通されていることを特徴とする請求項1〜3のいずれか一項に記載の半導体パッケージの実装構造。
- 前記バンプ径R1が、前記ビア径R2よりも小さいことを特徴とする請求項1〜4のいずれか一項に記載の半導体パッケージの実装構造。
- 前記バンプ高さHが、前記ビア深さDよりも大きいことを特徴とする請求項1〜5のいずれか一項に記載の半導体パッケージの実装構造。
- 前記熱硬化性接着剤の線膨張係数と、前記異方性導電材料に含まれる前記絶縁樹脂の線膨張係数とが、前記半導体チップの線膨張係数と、前記プリント配線板の線膨張係数との間であることを特徴とする請求項1〜6のいずれか一項に記載の半導体パッケージの実装構造。
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Cited By (9)
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JP2009016726A (ja) * | 2007-07-09 | 2009-01-22 | Elpida Memory Inc | 半導体装置及びその製造方法 |
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JP2009016726A (ja) * | 2007-07-09 | 2009-01-22 | Elpida Memory Inc | 半導体装置及びその製造方法 |
JP2011014680A (ja) * | 2009-07-01 | 2011-01-20 | Casio Computer Co Ltd | 半導体装置の製造方法 |
JP2014083705A (ja) * | 2012-10-19 | 2014-05-12 | Konica Minolta Inc | インクジェットヘッド |
JP2015126229A (ja) * | 2013-12-26 | 2015-07-06 | インテル コーポレイション | 可撓性マイクロ電子アセンブリ及び方法 |
JP2016115799A (ja) * | 2014-12-15 | 2016-06-23 | 富士通株式会社 | 電子装置及び電子装置の製造方法 |
JP2017228659A (ja) * | 2016-06-22 | 2017-12-28 | 株式会社ジェイテクト | 半導体装置 |
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JP7335574B2 (ja) | 2017-07-11 | 2023-08-30 | スージョウ レキン セミコンダクター カンパニー リミテッド | 発光素子パッケージ |
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JP7252597B2 (ja) | 2017-09-01 | 2023-04-05 | スージョウ レキン セミコンダクター カンパニー リミテッド | 発光素子パッケージ |
CN110194435A (zh) * | 2018-02-26 | 2019-09-03 | Tdk电子股份有限公司 | 电子设备 |
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Also Published As
Publication number | Publication date |
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TWI431746B (zh) | 2014-03-21 |
US20080308314A1 (en) | 2008-12-18 |
TW200919678A (en) | 2009-05-01 |
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