wire bonding technology

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1、AdivisionofSPTRothGroupWireBondingTechnologyWireBondingProcessAprocessofinterconnectingthebondpadmetallizationtotheleadpostwithaconductingwiresoastocompletetheelectriccircuitbetweenthechiptotheleadexternaltothepackage.WireBondingProcess(Cont.)BGAQFPWireBondingProcess(Cont.)QFNSm

2、artCardThreetypeofW/BprocessesThermosonicbonding/ballbonding-Heatandultrasonicareappliedtobondtwodifferentmetallicsurfacesunderpressuretoformabond,morethan90%ofallsemiconductorpackagesiswiththisprocessThreetypeofW/BprocessesUltrasonicbonding/wedgebonding-Ultrasonicenergyisapplie

3、dontwometallicsurfacesunderpressuretoformabondThermalcompressionbonding-Seldomusedtoday,butistheoriginaltechnologydevelopedbyBellLabsin1957forelectricalinterconnectionDifferencesBetweenT/S(ThermoSonic)andU/S(UltraSonic)T/SU/SWireAu/CuAl/AuToolCapillaryWedgeBondingTemp.NeedHeatin

4、gRoomTemp.BonderNeedEFODon’tneedEFOLoopingLoopingnon-directionaldirectionalBallBondingSequenceBallBondingSequence(Cont.)BallBondingSequence(Cont.)BallBondingSequence(Cont.)FirstbondKeyattributesòBondpower/force/timeòBondtemperature(thermosonicbondingonly)òBondpadmetallizationtyp

5、eòCapillarydesignòPRSperformanceKeyeffectsòBallshape(size,height)òBondstrengthòCrateringòBallplacementBallBondingSequence(Cont.)BallBondingSequence(Cont.)LoopingKeyattributesòWire(type,size)òTooldesign(clearancebetweentoolinnerdiameterandwire)òLoopingalgorithm/Wirefeedingsystemò

6、HAZòWirespoolingKeyeffectsòLoopheightòWireswayòWiresaggingòWiresweepduringmoldingBallBondingSequence(Cont.)BallBondingSequence(Cont.)SecondbondKeyattributesòBondpower/force/timeòBondtemperature(thermosonicbondingonly)òLFsurfaceòLFclampingòCapillarydesignKeydefectsòLiftedpostòSma

7、shbondòBrokenwireBallBondingSequence(Cont.)BallBondingSequence(Cont.)FirstbondpreparationKeyattributesòWiretaillengthòEFOsettings(ballsizeratio/torchcurrent,torchtime)òEFOgapòThesurfacetensionofthemoltenmetalmaintainsasphericalshapewhilethewirecoolsandsolidifiesKeyeffectsòToosma

8、llballwillresultinpluggingthecapillaryòToolarge