Patent ID: 7626275
Filing Date: 2009-12-01
Classification: H01L

Abstract:
1. A semiconductor device mounting arrangement comprising: a semiconductor substrate including opposed front and back surfaces; a metallic lead frame for bonding to said rear surface of said semiconductor substrate; AuSn solder interposed between said back surface of said semiconductor substrate and said lead frame; a first metal film of Ni forming an alloy with said AuSn solder, said first metal film contacting said back surface of said semiconductor substrate; a second metal film of Ti producing isothermal solidification of said AuSn solder, said second metal film being interposed between said AuSn solder and said first metal film and contacting said first metal film; and a third metal film of Au, improving solder wetting properties, said third metal film being interposed between and contacting said second metal film and said AuSn solder.