Patent ID: 9666506
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a wiring substrate; a semiconductor element mounted on the wiring substrate; a heat dissipation plate arranged on an upper surface of the semiconductor element with an adhesive arranged in between; and an encapsulation resin that fills a gap between the heat dissipation plate and the wiring substrate; wherein the heat dissipation plate includes: wherein the projection projects outward from an end of the body and is located below the body, the encapsulation resin covers upper and lower surfaces of the projection, the body includes an upper surface exposed from the encapsulation resin; the projection includes: the extension includes a first end, which is connected to the connection portion, and a second end, which is located at a side opposite to the first end, wherein the second end includes an outer side surface of the extension exposed from an outer side surface of the encapsulation resin, and the second end of the extension includes a cutaway portion to decrease an area of the outer side surface of the extension exposed from the outer side surface of the encapsulation resin, wherein the cutaway portion is cut in the outer side surface of the extension so that a thickness of the second end is smaller than a thickness of the first end.