Patent ID: 7768121

Claim:
A semiconductor package, comprising: a semiconductor chip having a plurality of first thermal fins on a portion of a non-active surface of the semiconductor chip, wherein the first thermal fins longitudinally extend across the portion of the non-active surface of the semiconductor chip; a heat conducting device having a plurality of second thermal fins on a portion of a mating surface of the heat conducting device, wherein the second thermal fins longitudinally extend across the portion of the mating surface of the heat conducting device; and a thermal joint formed between the non-active surface of the semiconductor chip and the mating surface of the heat conducting device, wherein the thermal joint comprises a band of interdigitated thermal fins comprising the first and second thermal fins mated together and thermally coupled using an intervening rigid bonding material or a compliant thermally conductive material having a thickness entirely separating the semiconductor chip from the heat conducting device, wherein the rigid bonding material comprises a thermally conductive solder or a filled polymer such as silver filled epoxy, and wherein the thermal joint further comprises a complaint thermal conductive material formed between planar portions of the non-active surface of the semiconductor chip and the mating surface of the heat conducting device whereby the rigid bonding material or compliant thermally conductive material mechanically contacts the heat conducting device and the non-active surface of the semiconductor chip.