abstract |
The present invention relates to a lead-free bump in which generation of voids obtained by reflowing a Sn-Ag-based solder alloy plated film in which Ag concentration in a plated film is adjusted is suppressed and a method of forming the same. The lead-free bump of the present invention is obtained by forming an Ag-containing Sn-Ag based alloy film having a lower Ag-Ag eutectic concentration by plating and reflowing the alloy plating film. |