JP2008205321A - 電子部品および電子装置の製造方法 - Google Patents
電子部品および電子装置の製造方法 Download PDFInfo
- Publication number
- JP2008205321A JP2008205321A JP2007041545A JP2007041545A JP2008205321A JP 2008205321 A JP2008205321 A JP 2008205321A JP 2007041545 A JP2007041545 A JP 2007041545A JP 2007041545 A JP2007041545 A JP 2007041545A JP 2008205321 A JP2008205321 A JP 2008205321A
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- Prior art keywords
- electronic component
- solder
- electrode
- solder sheet
- heating
- 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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- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/06—Soldering, e.g. brazing, or unsoldering making use of vibrations, e.g. supersonic vibrations
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- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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Abstract
【解決手段】 電極突起12にはんだが被着された接続電極を備える電子部品の製造方法であって、はんだシート20を半溶融状態に加熱し、はんだシート20に電子部品10を押接して前記電極突起12をはんだシート20に接触させる工程と、前記電極突起12が前記はんだシート20に接触した位置から電子部品10を離間させ、はんだシート20に接触した前記電極突起12の外面にはんだ20aを転写させる工程とを備える。
【選択図】図1
Description
半導体チップの電極にはんだバンプを形成する方法には、キャリアチップにドット状にはんだ層を形成して半導体チップの電極にはんだ層を転写する方法(特許文献1参照)や、半導体チップの電極を加熱した状態で電極にはんだシートを接触させ、はんだを溶融させて電極にはんだを付着させることによってはんだバンプを形成する方法(特許文献2参照)がある。
また、半導体チップを配線基板に接合する際には半導体チップを加熱しながら接合するが、半導体チップは配線基板にくらべて熱伝導性が良好であるから、配線基板の接続パッドに供給されたはんだが溶融したときに電極突起側にはんだが濡れ上がり、半導体チップの接合性が不確実になるという問題がある。
すなわち、電極突起にはんだが被着された接続電極を備える電子部品の製造方法であって、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させる工程と、前記電極突起がはんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写させる工程とを備えることを特徴とする。
また、前記加熱ステージと前記加熱ヘッドとを、前記はんだシートを半溶融状態とする温度に加熱するとともに、前記加熱ステージの加熱温度を前記加熱ヘッドの加熱温度よりも高温に設定することによって、電極突起に確実にはんだを被着させることができる。
また、前記はんだシートを加熱ステージに支持するとともに、前記電子部品を超音波ヘッドに支持し、前記加熱ステージと前記超音波ヘッドにより前記はんだシートと前記電子部品とを挟圧し、前記超音波ヘッドにより前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接する方法が有効である。
また、前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接する操作を、窒素雰囲気下で行うことにより、電極突起に形成されるはんだのフレッティング腐食を防止することができる。
また、前記電子部品として、前記はんだシートに前記電極突起を押接する際に、電子部品に超音波を印加して前記はんだシートから電極突起にはんだを転写した電子部品を用いることが有効である。
また、前記配線基板の前記電子部品が実装される領域にあらかじめフラックスフィルを塗布し、前記電子部品の接続電極と前記配線基板の接続パッドとを位置合わせし、該電子部品と配線基板とを前記はんだが溶融する温度に加熱するとともに、前記フラックスフィルを熱硬化して前記電子部品と配線基板とを接合することにより、電極突起と接続パッドとを確実に接合することができるとともに、電子部品と配線基板との接合部を封止して、電子部品と配線基板との接合部を確実に保持することができる。
また、電極突起にはんだが被着された接続電極を備える電子部品を、接続パッドが形成された配線基板に、前記接続電極を接続パッドに接合して実装されて形成された電子装置として、前記電子部品は、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させた後、前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写して形成され、該電子部品の接続電極と配線基板の前記接続パッドとを位置合わせし、前記はんだが溶融する温度に加熱して前記電子部品と配線基板とを接合する工程を有する製造方法により形成された電子装置が好適に用いられる。
図1は、半導体チップの電極突起の外面にはんだを被着して接続電極が形成された電子部品を製造する工程を示す。図1(a)は、半導体チップ10の電極に電極突起12を形成した状態である。電極突起12は、いわゆるボールボンディング法によって形成される。ボンディングツールにより金ワイヤを溶融してボール部を形成し、半導体チップ10の各々の電極(不図示)にボール部12aを押接し、金ワイヤを引き上げながら切断して突起部12bが形成される。突起部12bはやや扁平に形成されたボール部12aから尖鋭形状に突出する形態に形成される。
本実施形態の半導体チップ10の電極突起12の高さは30μm程度であるので、はんだシート20としては厚さ50μmのものを使用した。また、本実施形態で使用したはんだシート20はSn−Ag(錫−銀)はんだからなるもので、融点220℃のものである。
本実施形態において使用しているSn−Agはんだの融点は220℃であり、170℃程度から半溶融状態になる。
電極突起12の突起部12bに被着するはんだ20aの厚さは平均2〜3μm、最大5μm程度である。電極突起12にこの程度の厚さにはんだ20aが付着することで、配線基板に形成された接続パッドと確実にはんだ接合される。
図2は、はんだシート20を使用して半導体チップ10の電極に設けた電極突起12にはんだを転写する第2の実施の形態を示す。
本実施の形態では、半導体チップ10を超音波ヘッド40によって吸着支持し、はんだシート20から半導体チップ10の電極突起12にはんだを転写する際に、半導体チップ10に超音波を作用させて電極突起12にはんだを転写することを特徴とする。
このように、窒素雰囲気下で半導体チップ10に超音波を印加してはんだシート20から電極突起12にはんだを転写する方法によれば、電極突起12に被着されるはんだ20aが酸化することを抑制することができ、電子部品を実装する際に確実にはんだ接合することができる。
図4は、電極突起12にはんだ20aが被着された接続電極14が形成された電子部品を配線基板に実装して電子装置を組み立てる製造工程例を示す。本実施形態の電子装置は、配線基板50に半導体チップ10をフリップチップ接続し、半導体チップ10と配線基板50との接合部が樹脂によって封止され、半導体チップ10が配線基板50に固着されて形成されている。
本実施形態の電子装置の製造方法は、配線基板50の半導体チップ10を搭載する領域に、あらかじめフラックスフィル60を塗布しておき、半導体チップ10をフリップチップ接続によって配線基板50に搭載する方法による。
フラックスフィル60は、半導体チップ10を配線基板50に搭載する際に、電極突起12と接続パッド52との接合性を確保するフラックスとしての作用と、半導体チップ10を配線基板50に搭載した後、半導体チップ10と配線基板50との間を充填し、半導体チップ10を配線基板50に固定支持するアンダーフィル樹脂としての作用を備えるものである。
図4(c)は、配線基板50に半導体チップ10を接合して電子装置を組み立てた状態を示す。半導体チップ10に形成された電極突起12が配線基板50に形成された接続パッド52に各々はんだ接合され、半導体チップ10と配線基板50との間にフラックスフィル60が充填され、半導体チップ10と配線基板50との接合部分が封止されている。
また、この場合に、半導体チップ10の加熱温度をはんだ20aの融点よりも低く設定し、配線基板50の加熱温度をはんだ20aの融点よりも高く設定することにより、接続パッド52から電極突起12側にはんだが濡れ上がるようになることを防止して、さらに確実なはんだ接合ができる。
また、半導体チップ10についても、はんだシート20から電極突起12にはんだ20aを転写することにより、狭ピッチに電極突起12が形成された半導体チップ(電子部品)を形成できるから、電極が高密度配置されている半導体チップであっても確実に配線基板に搭載することが可能になる。
なお、上記実施形態では電子部品として半導体チップを取り上げて説明したが、場合によっては半導体チップを搭載した半導体パッケージを実装する場合についても本願発明方法を適用することが可能である。この場合には半導体パッケージが電子部品に相当し、半導体パッケージを実装基板に搭載した製品が電子装置に相当する。
(付記2) 前記はんだシートを加熱ステージに支持するとともに、前記電子部品を加熱ヘッドに支持し、前記加熱ステージと前記加熱ヘッドとにより前記はんだシートと前記電子部品とを挟圧して、前記はんだシートに前記電極突起を押接することを特徴とする付記1記載の電子部品の製造方法。
(付記3) 前記加熱ステージと前記加熱ヘッドとを、前記はんだシートを半溶融状態とする温度に加熱するとともに、前記加熱ステージの加熱温度を前記加熱ヘッドの加熱温度よりも高温に設定することを特徴とする付記2記載の電子部品の製造方法。
(付記4) 前記はんだシートに前記電子部品を押接する際に、電子部品に超音波を印加することを特徴とする付記1記載の電子部品の製造方法。
(付記5) 前記はんだシートを加熱ステージに支持するとともに、前記電子部品を超音波ヘッドに支持し、前記加熱ステージと前記超音波ヘッドにより前記はんだシートと前記電子部品とを挟圧し、前記超音波ヘッドにより前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接することを特徴とする付記4記載の電子部品の製造方法。
(付記6) 前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接する操作を、窒素雰囲気下で行うことを特徴とする付記4または5記載の電子部品の製造方法。
(付記7) 電極突起にはんだが被着された接続電極を備える電子部品を、接続パッドが形成された配線基板に、前記接続電極を接続パッドに接合して実装する電子装置の製造方法において、前記電子部品は、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させた後、前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写して形成され、該電子部品の接続電極と配線基板の前記接続パッドとを位置合わせし、前記はんだが溶融する温度に加熱して前記電子部品と配線基板とを接合する工程を備えることを特徴とする電子装置の製造方法。
(付記8) 前記電子部品として、前記はんだシートに前記電子部品を押接する際に、電子部品に超音波を印加して前記はんだシートから電極突起にはんだを転写した電子部品を用いることを特徴とする付記7記載の電子装置の製造方法。
(付記9) 前記配線基板を加熱ステージに支持するとともに、前記電子部品を実装加熱ヘッドに支持し、前記加熱ステージを前記はんだの融点以上に加熱する一方、前記実装加熱ヘッドの加熱温度を前記加熱ステージよりも低温に設定して前記電子部品と配線基板とを接合することを特徴とする付記7または8記載の電子装置の製造方法。
(付記10) 前記配線基板の前記電子部品が実装される領域にあらかじめフラックスフィルを塗布し、前記電子部品の接続電極と前記配線基板の接続パッドとを位置合わせし、
該電子部品と配線基板とを前記はんだが溶融する温度に加熱するとともに、前記フラックスフィルを熱硬化して前記電子部品と配線基板とを接合することを特徴とする付記7〜9のいずれか一項記載の電子装置の製造方法。
(付記11) 電極突起にはんだが被着された接続電極を備える電子部品であって、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させる工程と、前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写させる工程とを有する製造方法により形成されたことを特徴とする電子部品。
(付記12) 電極突起にはんだが被着された接続電極を備える電子部品を、接続パッドが形成された配線基板に、前記接続電極を接続パッドに接合して実装されて形成された電子装置であって、前記電子部品は、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させた後、前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写して形成され、該電子部品の接続電極と配線基板の前記接続パッドとを位置合わせし、前記はんだが溶融する温度に加熱して前記電子部品と配線基板とを接合する工程を有する製造方法により形成されたことを特徴とする電子装置。
12 電極突起
12a ボール部
12b 突起部
14 接続電極
20 はんだシート
21 凹部
30 加熱ステージ
32 実装加熱ヘッド
40 超音波ヘッド
50 配線基板
52 接続パッド
60 フラックスフィル
70 加熱ステージ
80 加熱ヘッド
Claims (10)
- 電極突起にはんだが被着された接続電極を備える電子部品の製造方法であって、
はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させる工程と、
前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写させる工程と、
を備えることを特徴とする電子部品の製造方法。 - 前記はんだシートを加熱ステージに支持するとともに、前記電子部品を加熱ヘッドに支持し、
前記加熱ステージと前記加熱ヘッドとにより前記はんだシートと前記電子部品とを挟圧して、前記はんだシートに前記電極突起を押接することを特徴とする請求項1記載の電子部品の製造方法。 - 前記加熱ステージと前記加熱ヘッドとを、前記はんだシートを半溶融状態とする温度に加熱するとともに、前記加熱ステージの加熱温度を前記加熱ヘッドの加熱温度よりも高温に設定することを特徴とする請求項2記載の電子部品の製造方法。
- 前記はんだシートに前記電子部品を押接する際に、電子部品に超音波を印加することを特徴とする請求項1記載の電子部品の製造方法。
- 前記はんだシートを加熱ステージに支持するとともに、前記電子部品を超音波ヘッドに支持し、
前記加熱ステージと前記超音波ヘッドにより前記はんだシートと前記電子部品とを挟圧し、前記超音波ヘッドにより前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接することを特徴とする請求項4記載の電子部品の製造方法。 - 前記電子部品に超音波を印加して前記はんだシートに前記電極突起を押接する操作を、窒素雰囲気下で行うことを特徴とする請求項4または5記載の電子部品の製造方法。
- 電極突起にはんだが被着された接続電極を備える電子部品を、接続パッドが形成された配線基板に、前記接続電極を接続パッドに接合して実装する電子装置の製造方法において、
前記電子部品は、はんだシートを半溶融状態に加熱し、はんだシートに電子部品を押接して前記電極突起をはんだシートに接触させた後、前記電極突起が前記はんだシートに接触した位置から電子部品を離間させ、はんだシートに接触した前記電極突起の外面にはんだを転写して形成され、
該電子部品の接続電極と配線基板の前記接続パッドとを位置合わせし、前記はんだが溶融する温度に加熱して前記電子部品と配線基板とを接合する工程を備えることを特徴とする電子装置の製造方法。 - 前記電子部品として、前記はんだシートに前記電子部品を押接する際に、電子部品に超音波を印加して前記はんだシートから電極突起にはんだを転写した電子部品を用いることを特徴とする請求項7記載の電子装置の製造方法。
- 前記配線基板を加熱ステージに支持するとともに、前記電子部品を実装加熱ヘッドに支持し、
前記加熱ステージを前記はんだの融点以上に加熱する一方、前記実装加熱ヘッドの加熱温度を前記加熱ステージよりも低温に設定して前記電子部品と配線基板とを接合することを特徴とする請求項7または8記載の電子装置の製造方法。 - 前記配線基板の前記電子部品が実装される領域にあらかじめフラックスフィルを塗布し、
前記電子部品の接続電極と前記配線基板の接続パッドとを位置合わせし、
該電子部品と配線基板とを前記はんだが溶融する温度に加熱するとともに、前記フラックスフィルを熱硬化して前記電子部品と配線基板とを接合することを特徴とする請求項7〜9のいずれか一項記載の電子装置の製造方法。
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US11/951,693 US7833831B2 (en) | 2007-02-22 | 2007-12-06 | Method of manufacturing an electronic component and an electronic device |
CN2007101597560A CN101252093B (zh) | 2007-02-22 | 2007-12-21 | 电子元件和电子装置的制造方法、电子元件以及电子装置 |
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JP2010080540A (ja) * | 2008-09-24 | 2010-04-08 | Fujitsu Ltd | 電極接続部の形成方法 |
JP2012529776A (ja) * | 2009-06-11 | 2012-11-22 | クアルコム,インコーポレイテッド | タイトピッチのフリップチップ集積回路のパッケージを作る方法 |
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US20110147923A1 (en) * | 2009-12-21 | 2011-06-23 | Jiun Hann Sir | Surface Mounting Integrated Circuit Components |
DE102010015520A1 (de) * | 2010-04-16 | 2011-10-20 | Pac Tech-Packaging Technologies Gmbh | Verfahren und Vorrichtung zur Ausbildung von Lotdepots |
US8070043B1 (en) * | 2010-12-02 | 2011-12-06 | Rohm And Haas Electronic Materials Llc | Curable flux composition and method of soldering |
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US7833831B2 (en) | 2010-11-16 |
JP5066935B2 (ja) | 2012-11-07 |
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