Patent ID: 9653390
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor element; a surface electrode formed on a surface of the semiconductor element; a metal film formed on the surface electrode so as to have a joining portion and a stress relieving portion formed so as to border on and surround the joining portion; solder joined to the joining portion while avoiding the stress relieving portion; an external electrode joined to the joining portion through the solder; and a layer formed of a material less solderable with the solder than a surface portion in the joining portion, the layer being provided on a surface of the stress relieving portion in a position to prevent the solder from wet-spreading into a region right above the stress relieving portion, wherein the layer is thinner than the solder, and the stress relieving portion is formed so that a length from a portion bordering on the joining portion to an outermost peripheral portion is equal to or larger than 10 μm.