Patent ID: 9530722
Filing Date: 2016-12-27
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor element; a first lead frame connected to a main surface of the semiconductor element with a solder; and a second lead frame connected to an opposite surface of the semiconductor element with a solder, wherein a space between the first lead frame and the second lead frame is filled with a molding resin, the second lead frame has a main portion and a base portion, the base portion being integrally formed with the main portion, projecting from the main portion toward the semiconductor element, and serving as a portion to be connected to the semiconductor element, a surface roughness of side walls of the base portion is higher than a surface roughness of a surface of the base portion that comes into contact with the solder for connection to the semiconductor element, and the surface roughness of the side walls is higher than a surface roughness of a surface of the main portion of the second lead frame that is connected to the molding resin.