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The effects of plating materials (Sn-10Pb, Sn-3.5Ag, Sn-3Bi, Sn-0.7Cu, and Au/Pd/Ni) on Cu leads on quad flat package (QFP) joints using a Sn-8Zn-3Bi solder were investigated. The joints with Sn-3.5Ag plating and Sn-8Zn-3Bi solder had the slowest growth rate of interfacial reaction layers and the highest strength. The Ag dissolution into the interfacial reaction layers causes this increased strength...
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