Patent ID: 7282396

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) disposing a lead frame over a sealing sheet disposed over a die surface of a resin molding die, the lead frame including a chip mounting portion, a plurality of suspending leads, and a plurality of leads; (b) clamping the resin molding die such that the plurality of leads come into close contact with the sealing sheet; (c) sealing a semiconductor chip mounted over the chip mounting portion with a sealing resin to form a sealing body such that the sealing resin is allowed to lap over back surfaces of the chip mounting portion and the suspending leads, and portions of back surfaces of the suspending leads corresponding to outer edge portions of the sealing body are covered by the sealing body; (d) advancing a cutting punch from a back surface side of the sealing body to cut the plurality of leads; (e) marking a front surface of the sealing body from the front surface side; and (f) advancing the cutting punch from the front surface side of the sealing body to cut the plurality of suspending leads.