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1、Lead-freePowerSupplyImplementationReferenceManualAPracticalGuidetoLead-FreeSoldering:Design,Material,Component,MachineandProcessIntroductionThismanualiswrittentoserveasworkingknowledgeandasaguidetoimplementalead-freemanufacturingsystem.Theinformationisbasedonthetrialresul
2、t,inputfromcustomerandsuppliertoworkoutthebasicrequirementforimplementingthelead-freeprocess.Introducinglead-freesolderingnormallyrequirestheusercopewithmoretighterprocesswindow,ifanysingleparametershiftedoutthelimit,itcanresultindramaticallyincreaseindefectrate.Soeverysi
3、ngleparameter/item,whichincludedesign,material,component,machineandprocess,mustbeperfectlycontrolandmatchedinordertoleadtoasuccessivelead-freesolderingprocess.Thefollowingrequirementsjustprovideyouaguidelinefortheimplementation,thefinalsuccessoflead-freesolderingprocessde
4、pendsmajoroneverybodyfocustomaintaintheconsistenceofprocessTherearetwoDrivingForcesforAstectoimplementLead-freeSolder1.TheRoHSdirectiveareputintoforcesinceFeb20032.CustomerdrivenduetomarketandtechnologytrendContent1.LayoutRequirements2.MachineRequirements3.HandSolderingRe
5、quirements4.SolderingMaterials5.ComponentsandPCBSurfaceFinish6.QualificationTestforLead-freeSolder7.CommonProductionDefectGuide8.InspectionCriteria1)Layoutrequirementforlead-freewavesolderingprocess(Forreflowsoldering,nodifferencebetweentin-leadandlead-freeonlayoutrequire
6、ment)a)TeardropsolderresistopeningforAI/RIpad(Updateasgeneralforbothtin-leadandlead-free)Thisistominimizethepossibilityofpinhole/incompletesolderingduetohighviscositycharacteristicoflead-freesolderb)Norobberpadrequirement(Forlead-freeonly)Duetohigherviscosityoflead-freeso
7、lder,biggerlandsizecanpullmoresoldertobouncebackresultinshortsolderc)DoublesidedboardPTHannularringsizeoncomponentsideshouldbe0.3mmforall.Ifsolderpadislayoutonbigcopperarea,usesolderresistopeningtocontrolthepadsizetoholesize+0.6mm(Updateasgeneralforbothtin-leadandlead-fre
8、e)Thesolderabilityoflead-freeisnotasgoodasthetin-lead,thereductioninannularringcanincreasetheflo
