Patent ID: 7410834

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: providing a lead frame including a semiconductor chip and leads, the semiconductor chip and the leads being sealed with a resin sealing body, wherein each of the leads has a first surface that extends inside and outside of the resin sealing body and that projects from a side face of the resin sealing body, and a second surface positioned opposite the first surface, the second surface being exposed from a back surface of the resin sealing body and having a plurality of recessed portions formed therein, the recessed portions being formed from the second surface toward the first surface and being spaced from each other along a projecting direction of the first surface; forming a plating layer over the first surface outside the resin sealing body, the second surface, and an inner wall surface of the recessed portions of each of the leads, the plating layer being higher in solder wettability than each of the leads; and cutting each lead such that at least one recessed portion thereof and at least part of another recessed portion thereof are exposed from the resin sealing body after the cutting.