Patent ID: 7728413

Claim:
A semiconductor device comprising: a semiconductor element; a metallic plate having a heat radiation surface; a terminal electrically connecting to the semiconductor element; and a resin mold covering the semiconductor element, the metallic plate and the terminal, wherein the metallic plate connects to the semiconductor element so that the metallic plate provides an electrode of the semiconductor element, the heat radiation surface of the metallic plate is capable of radiating heat generated in the semiconductor element, the heat radiation surface of the metallic plate and a part of the terminal are exposed from the resin mold to an outside of the semiconductor device, the resin mold includes a concavity/convexity portion disposed between the heat radiation surface of the metallic plate and the part of the terminal in order to lengthen a creepage distance between the heat radiation surface and the part of the terminal, and the concavity/convexity portion is disposed on a surface of the resin mold, the surface of the resin mold parallel to and spaced from the heat radiation surface of the metallic plate, the concavity/convexity portion includes a protrusion, and where the protrusion is spaced away from a vertical edge of the resin mold and a surface of the resin mold that faces the protrusion, the protrusion protrudes from the surface of the resin mold to a point between parallel planes containing the heat radiation surface of the metallic plate and the surface of the resin mold, the point being recessed away from the heat radiation surface of the metallic plate.