Patent ID: 8436250

Claim:
A metal core substrate comprising: a metal core layer having a first surface and a second surface opposite from the first surface; a first insulating layer covering the first surface of the metal core layer and having a first hole; a second insulating layer covering the second surface of the metal core layer and having a second hole; a first wiring layer formed on the first insulating layer; a second wiring layer formed on the second insulating layer; a first metal connection disposed in the first hole so as to connect the first wiring layer and the first surface of the metal core layer; and a second metal connection disposed in the second hole so as to connect the second wiring layer and the second surface of the metal core layer, the metal core substrate being formed as a hexahedron defined by a top rectangular surface, a bottom rectangular surface and four side surfaces connecting the top and bottom rectangular surfaces, and the metal core layer including a groove separating the metal core layer into a plurality of conductive patterns that are physically separated and electrically insulated from each other; and a semiconductor element embedded in the first insulating layer insulating the conductive patterns of the metal core layer from each other, and a third opening formed in the first insulating layer so that an electrode pad disposed on a surface of the semiconductor element and the first wiring layer on the first insulating layer are electrically connected through the opening.