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CapillaryDesignFundamentals&SelectionCapillaryDesignFundamentals&Selection!Capillaryselectionbasedonbondingrequirements!Capillarydimensionsaffectingball,stitchbondsandlooping!ActualexperimentaldataPresentationOutlinePresentationOutline(Ball)CapillarySelectionCapillarySelectionHoleSizeHoleSize(H)(H)HWDH=WD+40%±10%Recommended:H=1.4WDForFinePitch:H=1.3WD(min)Ultra-finePitch=1.2WD(min)MfgStandardHoleSize:25,28,30,33,35,38,41,43,46,51,64,68,75,84,90,100,127,178umCapillarySelectionCapillarySelectionθθθθ↑↑↑↑θθθθ↑↑↑↑↑↑↑↑θθθθHoleSize(H)HoleSize(H)0.001.002.003.004.005.006.007.008.009.0010.0020304050607080WireFeed-OutAngle(Degree)AverageDragForce(gFHoleSize(H)HoleSize(H)HH!Affectloopingperformance!Affectwirefeeding!Affectrateofload-upHoleSize(H)HoleSize(H)ChamferDiameterChamferDiameter(CD)(CD)MBD(min)=CD+10%CDMBD/1.1(BPO-*10µm)/1.1≥≥≥≥H+8µm[std]≥≥≥≥H+6µm[ufPitch]*10µmclearanceincludesmachine/operatorerror,capillarytoleranceBPOMBDCDCapillarySelectionCapillarySelectionCDCD!Affectballcentering!Affectsquashedballsize!Affectsquashedballshape!Affectstitchbondstrength!UselargestpossibleCDforgoodballshearreading!LargerCDresultsinsmallerwedgebondareaChamferDiameter(CD)ChamferDiameter(CD)BallShearStrengthForDifferentCapillariesType35.040.045.050.055.060.035DD35EP35EE35EX35EFTypesOfCapillaryBallShear(gmf)BallShearEffectOfCDonBallShearCD,umD51P53E58X60F64ChamferDiameter(CD)ChamferDiameter(CD)EffectOfCDonWirepullWirepullStrengthMeasurement(Stitch)ForDifferentCapillariesType4.05.06.07.08.09.010.011.035DD35EP35EE35EX35EFTypesOfCapillaryWirepullStrength(gmf)WirepullChamferDiameter(CD)ChamferDiameter(CD)CD,umD51P53E58X60F64ChamferAngleChamferAngle(CA)(CA)CDMBDMBDCDCA(70°)CA(120°)BiggerCA-BiggerMBD*WiththesameCD,H,FAB&WDSmallerCA-SmallerMBDCapillarySelectionCapillarySelectionMBDMBDForsmallerChamferAngle(CA),thelargertheFABvolumethatcanbecontainedinsidethechamfer,thusresultinginasmallerballsizeChamferAngle(CA)ChamferAngle(CA)Conventional90°CASpecialCAChamferAngle(CA)ChamferAngle(CA)120°CA90°CAChamferAngle(CA)ChamferAngle(CA)120°CABD=85.0µmaveBSR=50.2gmfaveBHT=15.7µmave90°CABD=84.4µmaveBSR=51.5gmfaveBHT=12.9µmaveChamferAngle(CA)ChamferAngle(CA)!Affectballcentering!Affectsquashedballsize!Affectsquashedballshape!AffecttailbondθθθθθθθθChamferAngle(CA)ChamferAngle(CA)InnerChamfer‘IC’FunctionInnerChamfer‘IC’FunctionFABCenteringResultantfromUSTransferCapillarySelectionCapillarySelection‘TailTack’fortailformationICICInnerChamfer(IC)InnerChamfer(IC)!Affectballcentering!Affectsquashedballsize!Affectsquashedballshape!AffecttailbondICICInnerChamfer(IC)InnerChamfer(IC)FreeAirBallFreeAirBall(BallFormation)(BallFormation)FreeAirBallMashedBallCapillarySelectionCapillarySelectionFreeAirBall=MashedBallFreeAirBall=MashedBallFreeAirBallMashedBallVolFAB=VolMBVolFABVolMBFreeAirBall(FAB)FreeAirBall(FAB)FreeAirBall=MashedBallVolumeFreeAirBall=MashedBallVolumeFABØVolFAB=VolMBCDCAHMBD123VOL2VOL3++VOLFAB=VOL1=ππππH2(H-WD)/4VOL1VOL2=ππππ(CD3-H3)/24tan(0.5CA)VOL3=ππππMBD2(MBH)/4MBHWDVOLFAB=ππππFABØ3/6++=FreeAirBall(FAB)FreeAirBall(FAB)FAB=MBVolumeEquation(Empirical)FAB=MBVolumeEquation(Empirical)VolFAB=VolMBFABØCDCAHMBDMBHWDππππFABØ3/6=ππππH2(H-WD)/4+ππππ(CD3-H3)/24tan(0.5CA)+ππππMBD2(MBH)/4FABØ3=3H2(H-WD)/2+(CD3-H3)/4tan(0.5CA)+3MBD2(MBH)/2FABØ3=1.5H2(H-WD)+(CD3-H3)/4tan(0.5CA)+1.5MBD2(MBH)FreeAirBall(FAB)FreeAirBall(FAB)!Affectballheight!Affectballsize!AffectballshearstrengthFreeAirBall(FAB)FreeAirBall(FAB)BallHt=15umBallHt=10umBallSize=47umBallSize=44.5umFreeAirBall(FAB)FreeAirBall(FAB)FABsetting:40µmBallSize:46.3µmBallHt:5.5µmBSR:6.7g/mil^2FABsetting:44µmBallSize:50.6µmBallHt:15.8µmBSR:5.5g/mil^2FreeAirBall(FAB)FreeAirBall(FAB)CapillarydimensionsaffectsthestitchCapillarydimensionsaffectsthestitchbondformationbondformation2ndBond(Stitch)ORFATCapillarySelectionCapillarySelectionStitchLengthformedbyT,CDandORWDORSLTCapillarySelectionCapillarySelection‘OR’-‘FA’CombinationSmallerFABiggerORORORFAFABiggerFASmallerORCapillarySelectionCapillarySelectionFA4OR20FA4OR38FA15OR20FA15OR38OR-FACombinationOR-FACombinationFA=4FA=4°°°°°°°°WirepullStrengthComparisonforDifferentORCombination(FA=4)0.002.004.006.008.0010.0012.0014.00FA4OR30FA4OR38FA4OR20WirepullStrength(Stitch),gAveMinMaxFA4OR38FA4OR20OR-FACombinationOR-FACombinationFA=15FA=15°°°°°°°°WirepullStrengthComparisonforDifferentORCombination(FA=15)0.002.004.006.008.0010.0012.0014.00FA4OR30FA4OR38FA4OR20WirepullStrength(Stitch),AveMinMaxFA15OR38