TIN ALLOY SOLDER COMPOSITIONS

摘要

A lead-free and bismuth-free solder alloy composition for electronic assembly applications having reduced toxicity. The alloy composition comprises about 0.01% to about 4.5% silver; about 0.01% to about 3% copper; about 0.002% to about 5.0% antimony; about 85% to about 99% tin and about 0.002% to about 1% of either nickel or cobalt. The alloy composition has a melting temperature of about 217° C, with superior wetting and mechanical strength making the alloy composition well suited for electronic circuit board manufacture and lead less component bumping or column arrays, and replacement of conventional tin-lead solders.