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A comparison study between Sn3.5Ag solder ball and conventional Sn3.8AgO.7Cu (SAC387) solder ball was conducted on 33??33 FCPBGA with SOP pad finishing. After assembly, samples were subjected to laser scanning for slanted ball inspection. Visual inspection under low power scope was done to check for wrinkled balls. Cold ball pull (CBP) was used to evaluate the solder joint strength at 4 conditions,...
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