Patent ID: 7087845

Claim:
A metal-core multilayer printed wiring board comprising: a surface layer over which a semiconductor element is to be mounted; a metal plate as a core, disposed below a site on which the semiconductor element is to be mounted and below the surface layer as an inner layer; at least one inner layer of a laminate having an insulating layer and a conductor layer stacked alternately from the metal layer; a heat radiation layer formed over the surface layer: and a first blind via hole formed in the surface layer under but not below the site on which the semiconductor element is to be mounted and a second blind via hole formed in the surface layer below the site on which the semiconductor element is to be mounted, the semiconductor element and the heat radiation layer connected to the metal plate by the blind via holes; wherein a ground layer is disposed at the periphery of the heat radiation layer over the surface layer and connected to a chassis after mounting of the semiconductor element.