Patent ID: 7833833

Claim:
A method of manufacturing a semiconductor device comprising: (a) preparing a lead frame having a chip mounting portion on which a semiconductor chip is mounted, a plurality of first leads disposed around the chip mounting portion, a suspension lead having one end connected to the chip mounting portion, and, wherein, in a thickness direction of the lead frame, a thickness of the suspension lead at a cutting position where the suspension lead is to be cut is less than a respective thickness of each first lead at a position where the first lead is to be cut; (b) disposing the lead frame on a die surface of a resin molding die having a first molding die and a second molding die such that the semiconductor chip is located in a cavity of the resin molding die, and die-clamping the lead frame using the first molding die and the second molding die; (c) forming a sealing body resin-sealing the semiconductor chip by injecting resin into the cavity of the resin molding die, the sealing body being formed such that a portion of an obverse surface of each first lead facing substantially a same direction as a top surface of the sealing body is exposed from the sealing body, a reverse surface of a portion of the suspension lead inwardly adjacent to said cutting position is covered by the sealing body, and a portion of a reverse surface of each first lead is exposed from the sealing body; and (d) cutting off the suspension lead at said cutting position while using a cutting die to support a part of the sealing body formed on the reverse surface of said portion of the suspension lead.