Patent ID: 8763884

Claim:
A jointing method, comprising: preparing a semiconductor device having a first metal film including at least one of Au, Ag, Cu, and Pd; preparing a lead frame being made of Cu or having a second metal film including at least one of Au, Ag, Cu, and Pd; forming a third metal film on the first metal film, the third metal film including Sn of 20 wt % or more and less than 70 wt %, Ag, and Cu; and pressing the semiconductor device and the lead frame within a temperature of 250 to 450 degrees Centigrade to form a joining layer from components of the third metal layer and the lead frame, the joining layer including an intermetallic compound, the intermetallic compound including Sn of 20 wt % or more and less than 70 wt %, Ag, and Cu, and the intermetallic compound having a solidus line temperature of 270 degrees Centigrade or more.