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How many types of surface finish Sun&Lynn can do? How shall we choose surface finish for HDI PCB?
Sun&Lynn has a complete series of surface finish, such as: ENIG, OSP, HASL, Gold plating(soft/hard), Immersion Silver, Immersion Tin, Silver plating, Tin plating, Carbon Ink and etc.. OSP, ENIG, OSP+ENIG are widely used on HDI, usually we suggest customer use OSP or OSP+ENIG if the BGA PAD size smaller than 0.3mm.