Patent ID: 7589402

Claim:
A semiconductor module comprising: a heatsink, a substrate mounted to said heatsink via an adhesive, the substrate having a peripheral circuit component mount face and a hollowed center, a semiconductor chip mounted to said heatsink via said adhesive, the semiconductor chip located in the hollowed center of the substrate, peripheral circuit components mounted on the substrate and connected to said semiconductor chip via connecting wires, the peripheral circuit components surrounding the semiconductor chip in proximity thereto, and resin sealing the substrate, the semiconductor chip, the peripheral circuit components, and the connecting wires into one package, wherein the hollowed center of the substrate is of a sufficient size to fit a semiconductor chip and the connecting wires, and wherein a dam is located on a bottom surface of the substrate adjacent to the heatsink, the dam located around only an inner periphery of the bottom surface to prevent outflow of the adhesive toward the hollowed center when the substrate is bonded to the heatsink.