Patent ID: 6979843

Claim:
A power semiconductor device comprising: a semiconductor device having a top surface and a bottom surface; a metal block having a bottom surface and a top surface adhered to said bottom surface of said semiconductor device; a lead frame fixed on said top surface of said semiconductor device; and a casing of a mold resin completely covering said semiconductor device and being in contact with said semiconductor device, covering at least a part of said top surface of said metal block around said adhered semiconductor device, and covering a part of said lead frame and being in contact with a part of said lead frame, wherein said bottom surface of said metal block is not exposed to an outside of said power semiconductor device by being covered with part of said casing or an insulating layer which is different from said casing, another part of said lead frame is exposed from a main surface of said casing as a radiation part, and said radiation part is a recessed area provided in said lead frame, a bottom part of said recessed area being fixed on said top surface of said semiconductor device.