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1、UnderstandingtheWireBondPullTestByLeeLevinePresentedbyRayCathcartPurpose?Itmayappearthatthebonder/tool/wireisproducingweakwirebonds?It’simportanttounderstandthedataandthetestconditions?Thebondsmaybeweak,orthespecsmayneedtobecorrectedafterre-evaluatingtheprocess/testmethods2SomeBasics?Themaximu
2、mforcethatthepulltestcandetectislimitedbythestrengthofthewire.?TheHeatAffectedZone(HAZ)abovetheballshouldbetheweakestpartofawirebond.?Boththeballandthewedgebondweldedareasareseveraltimeslargerthanthewirecrosssection.Ifthebondliftsorfracturesattheinterfacethebondwasdefective.?Preferredfailuremo
3、desareneck,midspan,heelofsecondbond,inthatorder.?Thebreakingforcemeasuredatthehookisnotthesameastheforceexertedonthewire.3PullTestResolutionofForces4SimplifiedEquationsforPullTest=F*M1=F*M25PullTestR.O.F.SimplifiedF1=M1*FF2=M2*FwhereF=PullTestMeasurementF1,F2=Forceonthewireat1stor2ndBond6LowPu
4、llTestValues??Do1stand2ndbondpulltests.Ifthevaluesareclosetothestrengthofthewire(80%)andthefailuremodeisgood(nolifts)thentheproblemisloopgeometry.?If1stor2ndbondpulltestsareweak,orifliftsoccur,it’saparameterormaterialproblem.DOEsorplasmacleaningmayhelp.7LowLoopHeights(TSOPPackages)?M1&M2are>1;
5、Range1-3?PullTestreadingsarelowerthantheactualforceinthewire?PerceptionthatbondsareweakMAYbeincorrectF1=M1*FF2=M2*F8HighorStandardLoopHeight?M1&M2<1?RangeforM1&M2.5to1.0?ForceinWireislowerthantheTestForce?IftheWireBreakLoadis10gramsthenthePullTestresultsarehigherthan10grams.F1=M1*FF2=M2*F9Hook
6、Location?Midspanmeansthattheangleofthewireat1standsecondbondisequal,resultinginthesameforceineachleg.?ItisNOTthemiddleofthelooplengthwhenthedieishigherthan2ndbond.?A10-20%deviationfrommidspandoesn’thaveasignificanteffectontheresults.10PullTestExcelTemplate8InputData7H10d2106h6lhp0ts7.55Pull-Te
7、stMid-Span4Xe40%hl84%3PullTestForce[grams]210051015202530354045505565707580859095100HookLocation[%ofdfrom1stbond]1stBondBreakForce2ndBondBreakForceXPull-TestMid-SpanPoint11Conclusions?Understandthegeometry.?Thegoalisstrongbonds,nothighn
