LEAD-FREE SOLDER ALLOY SUPPRESSED IN OCCURRENCE OF SHRINKAGE CAVITY

摘要

A lead-free solder alloy having improved surface properties which suppresses minute irregularities and shrinkage cavities has a composition consisting essentially of Ag: 0.1 - 1.5 %, Bi: 2.5 - 5.0 %, Cu: 0.5 - 1.0 %, optionally Ni: 0.015 - 0.035 % and/or at least one of Ge and Ga: 0.0005 - 0.01 %, and a remainder of Sn and unavoidable impurities.