Patent ID: 7269017

Claim:
A circuit board assembly comprising: a co-fired substrate comprising a plurality of ceramic layers bonded to each other and conductor lines on at least some of the ceramic layers so that some of the conductor lines are between adjacent pairs of the ceramic layers, the co-fired substrate defining oppositely-disposed first and second surfaces; thermally-conductive vias extending through the substrate from the first surface to the second surface thereof; a circuit device mounted to the first surface of the substrate, the device being electrically interconnected to the conductor lines of the substrate, the device being thermally coupled to the thermally-conductive vias with a connecting material; a heat sink adjacent the second surface of the substrate; a solder material bonding the heat sink to the thermally-conductive vias at the second surface of the substrate, the connecting material, the thermally-conductive vias, and the solder material defining a thermal path from the device to the heat sink; and wherein the thermal path prevents current flow therethrough into the heat sink.