TW525281B - Wafer level chip scale package - Google Patents

Wafer level chip scale package Download PDF

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Publication number
TW525281B
TW525281B TW091104227A TW91104227A TW525281B TW 525281 B TW525281 B TW 525281B TW 091104227 A TW091104227 A TW 091104227A TW 91104227 A TW91104227 A TW 91104227A TW 525281 B TW525281 B TW 525281B
Authority
TW
Taiwan
Prior art keywords
wafer
bump
metal
pad
pads
Prior art date
Application number
TW091104227A
Other languages
English (en)
Inventor
Ren-Guang Fang
Original Assignee
Advanced Semiconductor Eng
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Advanced Semiconductor Eng filed Critical Advanced Semiconductor Eng
Priority to TW091104227A priority Critical patent/TW525281B/zh
Priority to US10/382,029 priority patent/US6713870B2/en
Application granted granted Critical
Publication of TW525281B publication Critical patent/TW525281B/zh

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    • H01L23/3114—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
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  • Condensed Matter Physics & Semiconductors (AREA)
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  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Semiconductor Integrated Circuits (AREA)

Description

52528i A7 ------------ 五、發明説明（1 ) '~S---- tjl領域 本發明係關於-種晶圓級晶片尺寸封裝件，尤其係關於 一種採用球下金屬層作為金屬銲線跨接之封裝件。 I明背景 p遺著1C技術的日益精進，並為了滿足傳輸快、散熱佳及 產品輕薄短小的需求，遂有晶圓級晶片尺寸封裝之技術因 應而生。該項技術不僅擁有上述之優勢，更具有其他的有 利點，例如：生產成本較低及外觀尺寸上更接近晶片的大 小。 圖1係習知之晶片之銲墊位置示意圖。晶片1〇包含有複 數個銲墊11，該銲墊11分佈排列在晶片10的四周。而晶 圓級晶片尺寸封裝的技術會在晶片i 0的表面再形成一層的 線路層，將分佈在四周的銲墊1丨重新連線至晶片中央的凸 塊銲墊（圖未示出），此對應之製造流程稱為銲墊重分佈 (I/O redistribution)技術。 圖2係習知之晶片之銲塾重分佈之示意圖，並請一併對 月?、圖3之剖面示意圖。在晶片2 〇的銲塾2 2及被動層 (passive layer ) 3 2上方有一金屬線路層，該金屬線路層係 在四周之知墊33上形成一金屬塾22，並由連接線路21將 金屬墊22之電性連接至凸塊銲墊23，該凸塊銲墊23大多 是做矩陣狀的排列。圖3係習知銲墊重分佈之晶片的剖面 示意圖。在金屬線路層的上方覆蓋一彈性被動層3 1，該彈 性被動層3 1位於凸塊銲墊2 3之位置設有孔洞，可使凸塊銲 墊2 3外露。最後凸塊銲墊2 3需要銲上錫鉛球或電鍍銅柱作 H:\HU\LGC\ 日月光台灣專利\ASEK269(74496).DOC 一 4 一 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐) 525281
為與基板（圖未示出）的接點，而彈性被動層3丨可以吸收 並阻絕由錫鉛球傳自基板的機械應力。 由圖2可以得知當晶片2 0之銲墊數目越多，則金屬線路 層的線路绐度越向，也就是重分佈之連接線路2丨的寬度與 間距變小，因此線路佈置的技術困難度益形增加，有時需 要將連接線路繞遠路才能完成重分佈之目的。但由於線路 在鬲速訊號傳輸時有很多限制，包括阻抗匹配、線路自 感、線路互感與串音（cross talk )等現象，所以線路之佈 置倍感限制重重而需要一試再試。 圖4係一習知之銲墊重分佈之局部線路示意圖。金屬墊 411藉由連接線路431連接至凸塊銲墊421的位置，而金屬 塾4 12則藉由連接線路43 2連接至凸塊銲墊422的位置。因 與其結合的基板之接點已設定電性功能，故無法使金屬墊 4 1 1與最接近的凸塊銲墊4 2 2連接在一起。此外，由於受 限於線路層之平面空間無法交叉越過，該連接線路4 3 i需 要繞過凸塊銲墊4 2 2及凸塊銲墊4 2 3之間才能連接到凸塊 銲墊42 1。 曼·塑之簡要說明 本發明之第一目的係提供一種晶圓級晶片尺寸封裝件， 係以金屬銲線跨越其他線路並連接銲墊，解決線路佈置的 作業困難性。 本發明之第二目的係提供一種晶圓級尺寸封裝之封裝 件，可縮短相關線路之路徑，提昇封裝件之電氣特性。 為了達到上述目的，本發明揭示一晶圓級尺寸封裝之封 HAHU\LGC\ 日月光台灣專利^啦69(74496)〇〇(： - 5 - 本紙張人度通用中關家標準(CNS) A4規格(21〇><297公釐） ' -- 五 、發明説明（ 2件’該晶片之銲墊上設有複數個金屬塾，另在同一金屬 ”路層有矩陣狀排列的凸塊銲墊。 八 ,._ 大部刀的凸塊銲墊都葬 由連接線路和各自指定的金屬塾 ^ 曰 揷锃航目士 简土連接。沒有連接線路的凸 鬼鋅t具有一延伸部，該凸塊銲執 μ ^ s 士 土及其延伸邵皆不受被動 層所覆盍。另有複數個金屬錦線連接該凸塊辞，之 與對應之金屬墊，該對應之金屬教 口 竭土斫不文被動層所覆蓋， 因此可直接跨越過其他連接線路 目的。 水合 < 上万而達到電性連接的 凰^之簡單說明 本發明將依照後附圖式來說明，其中： 圖1係習知之晶片之銲墊位置示意圖； 圖2係習知之晶片之銲墊重分佈之示意圖； 圖3係習知銲墊重分佈之晶片的剖面示意圖； 圖4係一習知之銲墊重分佈之局部線路示意圖； 、圖5係本發明之晶圓級晶片尺寸封裝件之—較佳實施例 之不意圖；及 圖6係圖5之封裝件延AA剖面之剖面示意圖。 !件符號說明 1 1銲墊 21連接線路 23凸塊銲墊 32被動層 34矽基材 1 0習知之晶片 2 0習知之銲墊重分佈之晶片 22金屬墊 31彈性被動層 33銲墊 3 5介電層 H:\HU\LGC\日月光台灣專利认5丑1^69(74496).00〇 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 525281 A7 ______B7 五、發明説明（4 ) 421，422, 423凸塊銲墊 521，522，523凸塊銲墊 54凸塊銲墊之延伸部 6 2被動層 65凸塊 411，412金屬墊 4 3 1，4 3 2連接線路 5 1 1，5 1 2金屬墊 5 3 1，5 3 2連接線路 5 5金屬銲線 6 1 1銲墊 6 4彈性被動層 6 6碎基材 較佳實施例說曰3 圖5係本發明之晶圓級晶片尺寸封裝件之一較佳實施例 之示意圖。金屬墊5 12藉由連接線路5 3 2連接至凸塊銲墊 522的位置。而金屬墊511為一獨立的金屬墊並無同一層 的連接線路，另有一凸塊銲墊521也是無連接線路與其相 連。孩凸塊銲墊5 2 1有一側面之延伸部5 4，其延伸方向朝 向著金屬墊5U。有一金屬銲線55之兩端跨接在金屬墊 511與延伸部54 ,其接合之方式係使用銲線技術將金線或 鋁線鎔接在金屬墊511與延伸部54的表面上。如此金屬銲 、、泉5 5形成一互體之跨接線路，可以直接越過連接線路η 2 之上方，而不需要繞過凸塊銲墊5 22與5 23之間的空隙。 圖6係圖5晶片延ΑΑ剖面之剖面示意圖。金屬墊511、 連接線路5 3 2、延伸部54與凸塊銲墊521係在同一金屬線 路層，該金屬線路層形成之步驟與覆晶技術中球下金屬層 可採類似之製程，係將三或四層之金屬層沈積在銲墊6ιι 及被動層62之上方，即直接將連接線路532、延伸部54及 hahu\lgc\日月光台灣專利认纽幻69(74496)1)〇(： 一 ‘一 525281
凸塊銲墊5 2 1形成在被動層6 2的上方，並金屬墊5 1丨同時 开/成在麵塾6 1 1上。另外在該金屬線路層之上方有一彈性 被動層64，其較常使用之材料為聚乙醯胺（p〇lyimide)或 BCB (benzocyclobut-ene)，可以承受高溫足以使錫鉛球鎔 接在基板（圖未示出）上而沒有損害產生，並能作為外在 應力之緩衝與吸收的物質。該彈性被動層6 4在金屬墊 5 1 1、凸塊銲墊5 2 1及延伸部5 4之對應的位置係有開口， 如此金屬銲線5 5及凸塊6 5才可以結合在對應的位置上。 本發明之技術内容及技術特點以揭示如上，然而熟悉本 項技術之人士仍可能基於本發明之重點及揭示而做種種不 背離本發明精神之替換及修飾。因此，本發明之保護範圍 應不限於實施例所闡述者，應為以下申請專利範圍所涵 蓋。 -8 -
H:\HU\LGC\曰月光台灣專利\ASEK269(74496).DOC 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公嫠)

Claims (1)

  1. 525281 A8 B8 C8 D8 經濟部智慧財產局員工消費合作社印製 六、申請專利範圍 1 · 一種晶圓級晶片尺寸封裝件，包含： 複數個晶片； 複數個銲墊，設於該複數個晶片之表面； 一被動層，設於該複數個晶片之表面，且相鄰於該 個銲墊； 複數個金屬墊，設於該複數個銲墊之表面； 複數個凸塊銲墊，設於該被動層之表面，且至少一土 乂 一凸塊 銲墊具有一延伸部； 複數個連接線路，設於該被動層之表面，用於電氣連接 該複數個金屬墊及該複數個凸塊銲墊；及 至少一金屬銲線，跨越於該連接線路，且用於電氣連接 該凸塊銲墊之延伸部和該金屬墊。 2 .如申請專利範圍第1項之晶圓級晶片尺寸封裝件 包含一彈性被動層，用於覆蓋該複數個連接線路 3 ·如申請專利範圍第1項之晶圓級晶片尺寸封裝件 包含複數個凸塊，設於該凸塊銲墊之表面。 4 ·如申請專利範圍第3項之晶圓級晶片尺寸封裝件 該複數個凸塊係錫鉛球。 5 ·如申請專利範圍第3項之晶圓級晶片尺寸封裝件 該複數個凸塊係銅柱。 6 ·如申請專利範圍第1項之晶圓級晶片尺寸封裝件 該複數個凸塊銲墊係呈矩陣狀排列配置。 7 ·如申請專利範圍第1項之晶圓級晶片尺寸封裝件 其另 其另 其中 其中 其中 其中 該複數個金屬塾、複數個凸塊錦墊及複數個連接線路係 H:\HU\LGC\日月光台灣專利\ASEK269(74496).DOC 9 一 J — I Ί--I---II--· I I (請先閱讀背面之注咅？事項再填寫本頁}
    525281 A8 B8 C8 D8 、申請專利範圍 利用球下金屬層之製程所形成。 8 .如申請專利範圍第1項之晶圓級晶片尺寸封裝件，其中 該凸塊銲墊之延伸部之面積大於該金屬銲線結合所需之 面積。 9 .如申請專利範圍第1項之晶圓級晶片尺寸封裝件，其中 該金屬銲線之線弧高度低於該凸塊之上頂點之高度。 (請先閱讀背面之注意事項再填寫本頁) ，裝 訂：
    經濟部智慧財產局員工消費合作社印製 H:\HU\LGC\日月光台灣專利认5£幻69(74496).0€«： 一 丄。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）
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