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1、UnderstandingtheWireBondPullTestByLeeLevinePresentedbyRayCathcartPurpose?Itmayappearthatthebonder/tool/wireisproducingweakwirebonds?It’simportanttounderstandthedataandthetestconditions?Thebondsmaybeweak,orthespecsmayneedtobecorrectedafterre-evaluatingtheprocess/testmethods2Some
2、Basics?Themaximumforcethatthepulltestcandetectislimitedbythestrengthofthewire.?TheHeatAffectedZone(HAZ)abovetheballshouldbetheweakestpartofawirebond.?Boththeballandthewedgebondweldedareasareseveraltimeslargerthanthewirecrosssection.Ifthebondliftsorfracturesattheinterfacethebond
3、wasdefective.?Preferredfailuremodesareneck,midspan,heelofsecondbond,inthatorder.?Thebreakingforcemeasuredatthehookisnotthesameastheforceexertedonthewire.3PullTestResolutionofForces4SimplifiedEquationsforPullTest=F*M1=F*M25PullTestR.O.F.SimplifiedF1=M1*FF2=M2*FwhereF=PullTestMea
4、surementF1,F2=Forceonthewireat1stor2ndBond6LowPullTestValues??Do1stand2ndbondpulltests.Ifthevaluesareclosetothestrengthofthewire(80%)andthefailuremodeisgood(nolifts)thentheproblemisloopgeometry.?If1stor2ndbondpulltestsareweak,orifliftsoccur,it’saparameterormaterialproblem.DOEso
5、rplasmacleaningmayhelp.7LowLoopHeights(TSOPPackages)?M1&M2are>1;Range1-3?PullTestreadingsarelowerthantheactualforceinthewire?PerceptionthatbondsareweakMAYbeincorrectF1=M1*FF2=M2*F8HighorStandardLoopHeight?M1&M2<1?RangeforM1&M2.5to1.0?ForceinWireislowerthantheTestForce?IftheWire
6、BreakLoadis10gramsthenthePullTestresultsarehigherthan10grams.F1=M1*FF2=M2*F9HookLocation?Midspanmeansthattheangleofthewireat1standsecondbondisequal,resultinginthesameforceineachleg.?ItisNOTthemiddleofthelooplengthwhenthedieishigherthan2ndbond.?A10-20%deviationfrommidspandoesn’t
7、haveasignificanteffectontheresults.10PullTestExcelTemplate8InputData7H10d2106h6lhp0ts7.55Pull-TestMid-Span4Xe40%hl84%3PullTestForce[grams]210051015202530354045505565707580859095100HookLocation[%ofdfrom1stbond]1stBondBreakForce2ndBondBreakForceXPull-TestMid-SpanPoint11Conclusion
8、s?Understandthegeometry.?Thegoalisstrongbonds,nothighn
