BSOB模式与BBOS模式

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1、CHAPTER61BondStickOnBall(BSOB)/BondBallOnStitch(BBOS)/TailBreak21.0)BONDSTICKONBALL(BSOB)1.1)DescriptionThisbondingprocessisspeciallydevelopedbyASMtohandlemulti-die(MCM)bondingapplication.Intheconventionalapproach,ifoneistryingtoconnectthegoldwirefromonedietotheanot

2、her,acapillarymarkofsecondbondwillbeevidentontopofthediewhichmaydamagethedie.TheBSOBprocesswillsolvethisproblembybondingaballontothedie’ssurfacefirst,followedbybondinganotherwirewherethesecondbond’swedgewillbelandingontopofthisbondedball(figure1).3Die1Die2BondBall2n

3、dBond(wedge)1stBondFigure1:BondStickOnBall(BSOB)42.0)BONDBALLONSTITCH(BBOS)/SECURITYBOND2.1)DescriptionThisprocessisalsoknownassecuritybond.Itbondsaballontopofthewedgeofthenormalconnectionwire.Thisprocessismainlyusedtosecurethesecondbondstickingcapability.(Figure2)D

4、ie1LeadBondBall2ndBond(wedge)1stBondFigure2:BondBallOnStitch(BBOS)53.1)FreeAirBall(FAB2)isalignedtothecenterofthebondpadondevice2.Device1Device2FAB23.0STANDOFFBALLCONTROLBONDINGSEQUENCE63.2)Capillarydescendsandbondsballtobondpad.Device1Device2W/clamp‘open’Capillary

5、Applicationof1stbondstandoffballparametertoform‘BallThickness’and‘BallSize’DuringStandOffBonding,SOBparametersareapplied.73.3)Capillaryrisestoloopbasetoclearball.Device1Device2W/clamp‘open’CapillaryrisestosetLoopBaseLoopBaseContactPt.Loopbaseisthedistancebetweenthe

6、capillarytipandcontactpoint.Recommendedsetting=283.4)Capillarymovetoprogrammeballoffset.Balloffsetcanbeprogrammedtowardsorawayfromthefirstbond.+vetowards2ndbond-veaway2ndbondDevice1Device2W/clamp‘open’ActualBallOffset=Settingx10umIfBallOffsetSetting=22ThenActualL

7、oopBase=220umRecommendedSetting=-ve3593.5)Capillarydescendsandformsstitchbondontopoftheball.Device1Device2W/clamp‘open’*BallThicknessSOBParameter(StandOffBallParameter)CapillarydescendstosetBallThickness(Amt.Zmovementabovetheballheight)ContactPt.*BallThicknessisthe

8、distancebetweenthecapillarytipandcontactpointRecommendedsetting=2103.6)Capillarymoveshorizontallyforascrubdistancetoweakenthewireatballn