Patent ID: 7095100

Claim:
A semiconductor device comprising: a die-pad including a first surface, a second surface opposite to the first surface, and a peripheral edge, the second surface including an exposed portion and a retreated portion around the exposed portion; a semiconductor chip mounted on the first surface of the die-pad; and a sealing resin covering the die-pad and the semiconductor chip, the resin allowing the exposed portion to be exposed and being held in contact with the retreated portion, wherein the die-pad is formed with at least one slit that is open in the retreated portion of the second surface and in the first surface, the at least one slit is located between the peripheral edge of the die-pad and the semiconductor chip, the semiconductor chip has a side facing the at least one slit and extending from a first corner of the chip to a second corner of the chip, and the at least one slit is formed along the side of the chip and extends continuously from a first position that is closer to the first corner of the chip than to the second corner of the chip to a second position that is closer to the second corner of the chip than to the first corner of the chip.