| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead-free solder alloy having the fatigue life equivalent to or longer than that of a lead-containing solder, and to provide an electronic circuit board using the solder alloy.SOLUTION: The solder alloy 5 contains ≥90 mass% Sn, and the balance containing one or more kinds of additive elements to be selected among a group consisting of Ag, Cu, Zn, Bi, Sb and In, and further contains <0.01 mass% inevitable impurities other than the additive elements. |
