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Introduction The RoHS has published a law of lead-free,fromJuly 1,2006,all the EMproducts mustn’tcontain these deleterious things,such as Pb,Hg,Cd, 6Cr,PBB and PBDE.So most of SMDchange the Sn-Pb platinginto tin-plating.It’s reported that whisker is easily grown onthe surface of tin-plating chips(see Fig.1).Thelengthis from5~300μm.If the distance that be-tween two leads is shorter than 500μm,thewhisker may be connect the leads andlead to shortdefect.Some other metallic elements a… 相似文献
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