Patent ID: 7514293

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a lead frame having a chip mounting portion, a plurality of leads disposed around the chip mounting portion, and suspending leads for supporting the chip mounting portion, each of the suspending leads having a bent portion, metal plating films being formed over a part of each of the plurality of leads and a part of each of the suspending leads including the bent portion, each of the metal plating films formed over the suspending leads having one end portion and another end portion opposing to the one end portion, the one end portion being positioned closer to the chip mounting portion than the another end portion; (b) after the step (a), mounting a semiconductor chip over the chip mounting portion such that the one end of each of the metal plating films formed over the suspending leads is overlapped with the semiconductor chip, the semiconductor chip having a main surface, a plurality of pads formed on the main surface and a rear surface opposing to the main surface; (c) after the step (b), electrically connecting the plurality of pads of the semiconductor chip with the plurality of leads via a plurality of wires and the metal plating films formed over the part of the plurality of leads, respectively; and (d) after the step (c), sealing the semiconductor chip and the plurality of wires with resin such that the rear surface of the semiconductor chip is contacted with the resin; wherein the bent portion is formed by following steps, (e1) providing a offset die having an upper die and a lower die opposing to the upper die, the upper die having a first uneven surface, the lower die having a second uneven surface; (e2) after the step (e1), disposing each of the suspending leads between the upper die and the lower die such that entire area of each of the metal plating films formed over the suspending leads is covered with the first uneven surface of the upper die; (e3) after the step (e2), clamping each of the suspending leads with the upper die and the lower die so as to form the bent portion and level each of the metal plating films formed over the suspending leads such that the entire area of each of the metal plating films formed over the suspending leads is not protruded from a surface of each of the suspending leads.