X-ray检查BGA检查标准

X-ray檢查BGA1X-ray檢查BGA表1為BGA自動檢查標準Fig1.BGA球腳的X-ray影像2◎短路──(2D可傾斜角或3D)由上向下，X-Y平面切割，可找出99.9％的短路或錫橋(單面SMT)。雙面SMT則需傾斜或旋轉、配合明暗度、放大等找出缺陷所在位置。◎球腳脫落──(2D即可)雙面SMT需配合斜角找出斷路(Open)的面。◎球腳偏位──(2D即可)◎球腳徑偏差、過大的氣孔、灰階偏差與非圓形接腳銲點──例如，圖1的X-ray影像外圈有黑環，那是因為球腳變矮胖所增加的”救生圈”；即Soldermask覆蓋pad周圍或被侵蝕之銅pad圓周所熔錫形成的。【註】：帶斜角視野、高倍之系統較易看清楚。◎氣孔不一定會影響可靠度、除非到達一定大小或量。平時也用％稱呼氣孔量。A.氣孔到多少％會有影響?還是得視製程參數?B.單一大的氣孔與球腳面積之比例。3Fig2.PBGA352的X-ray影像。──3個球腳接點非圓形，超過13％。──1個短路。──2個氣孔超過5％。──每個球腳氣孔所佔％。(a)(b)Fig3.(a)BGA球腳的上向下影像。(b)為其斜角的X-ray影像。圖(a)有輕微偏位與不良之球腳。圖中球腳被圈出者符合無”黑圈”不失圓形狀。4(a)(b)Fig4.圖(b)可看出三個球腳Open(斜角影像)，而圖(a)雖是3D，但看不太出來。圖3(b)下排最左邊的球腳，球形雖完美，但這是與pad吃錫不良所致，故判定為極易Open者。圖4(a)與(b)係2D配備斜角視野系統，對人員的”誤以為”判定及正確判定Open甚有用。◎3D最適於深度切片分析、全自動雙面板檢查與Z高度量測。◎2D帶斜角視野者，成本較低，對CSP、flip-chip等可提供更高倍數的斜角視野，誠如圖3、圖4所示，可找出更多缺陷。FX03-FX044-101414PCBA()C389PCBAFX044-1014214PCBA/C389Email20045313pcs.PCBA,4pcsPCB,4pcsCPU2004531~2004614PCBA22255055%RH101KpaIPCTM6102.1.1(Microsectioning)GB/T17359-98(X)BGAPCBAPCB1LEICAMZ60117011452XDx4i0117011223XL-30011701122-14OPTIPHOT2000117011202004200420042004PCBAFX044-1014314PCBAPCBCPUPCBAC389,1PCBACPUFlashPCBCPUFlashCPU2.11PCBBGABGA23PCB452CPUBGA3CPUBGAPCBAFX044-10144144PCBCPU5PCBFlash2.2X-RAYXX-Ray69BGA6CPUXray7FlashXray8CPUXray9FlashX-rayPCBAFX044-101451410CPU11Flash2.3BGABGA1225CPU1219PCB12CPU13CPUPCB141514PCBAFX044-1014614161718PCB11918AB20PCB221202227FlashPCBPCBAFX044-101471422Flash232425262724BGABGAPCBPCB1PCB23BGABGACPUCPUPCBAFX044-1014814CPUCPUBGA261272282928CPU129CPU2PCBAFX044-101491430CPU131CPU22.4IPC-TM-650.2.4.4526272612722.5PCBIPC-STD-003SolderabilityTestsforPrintedBoardsPCB235,3S,2829PCBBGAPCBPCBAFX044-1014101428PCB129PCB22.6SEMEDAX21EDAXA(Ni)(P)Sn30PCBPCB30APCB3121BSn,P(Ni),CPCBPCBAFX044-1014111431BCPUPCBSEM323332CPUPCB133CPUPCB2PCBSEM3435EDAX36C,(Ni)(Au)PCBAFX044-1014121434PCBCPU35PCBFLASH2.736PCB(1)BGAXrayBGAPCBAPCB(a)PCB(b)(c)BGA(2)BGABGABGABGACPUPCBAFX044-10141314BGABGAPCBA(3)BGA(4)PCBPCBPCBPCBPCBSEMEDAXPCBBGAPCBAPCBPCBAFX044-10141414,6110510610(020)8723717387237161(020)87237185(020)87236036(020)[e-mail]:©FoxitSoftware(3DImage)(Bottomside,BridgeError)GeneratedbyFoxitPDFCreator©FoxitSoftware©FoxitSoftware©FoxitSoftware©FoxitSoftware©FoxitSoftware