Lead-Free Solder Alloy

摘要

A lead-free solder alloy consisting essentially of, in mass percent, Bi: 31-59%, Sb: 0.15-0.75%, at least one element selected from Cu: 0.3-1.0% and P: 0.002-0.055%, and a balance of Sn has a low melting point for suppressing warping of a thin substrate during soldering. It can form solder joints with high reliability even when used for soldering to electrodes having a Ni coating which contains P, since the growth of a P-rich layer is suppressed so that the shear strength of the joints is improved and the alloy has a high ductility and a high tensile strength.

主权项

1. A lead-free solder alloy having an alloy composition consisting essentially of, in mass percent, Bi: 31-59%, Sb: 0.15-0.75%, at least one element selected from Cu: 0.3-1.0% and P: 0.002-0.055%, and a balance of Sn.