Patent ID: 7808085

Claim:
A semiconductor device, comprising: a semiconductor chip; a die pad on which the semiconductor chip is mounted; a dielectric resin sheet placed on one side of the die pad opposite the semiconductor chip, a first surface of the resin sheet being firmly adhered to the die pad at a connecting portion; and a resin casing made by a molding operation in which the semiconductor chip, the die pad and the resin sheet are molded by a resin in such a manner that a second surface of the resin sheet opposite the die pad is exposed to the exterior of the resin casing, a groove having a longitudinal axis formed in one surface of the resin casing, the longitudinal axis of the groove intersecting with the first surface of the resin sheet at the connecting portion of the resin sheet and the die pad, the groove extending parallel to the resin sheet continuously along an entire length of the resin casing and perpendicular to a runner through which the resin was supplied in the molding operation.