Patent ID: 7160760

Claim:
A manufacturing method of a semiconductor device including a MOSFET having a header, a gate outer lead and a plurality of source outer leads, said manufacturing method comprising the steps of: (a) providing a semiconductor chip having a first main surface and a second main surface opposite to said first main surface, said semiconductor chip having a gate electrode and a source electrode each disposed on said first main surface and a drain electrode disposed on said second main surface; (b) attaching a first lead frame over said source and gate electrode of said semiconductor chip, said first lead frame having portions which are to be said gate outer lead and said source outer leads, and said gate outer lead and source outer leads being electrically connected with said gate electrode and source electrode respectively; (c) attaching a second lead frame over said drain electrode of said semiconductor chip, said second lead frame having a portion which is to be said header, and said header being electrically connected with said drain electrode; (d) after the steps (b)and (c), setting said semiconductor chip, first lead frame and second lead frame in a cavity between a first molding die and a second molding die; (e) after the step (d), injecting resin into the cavity to form a resin encapsulant; (f) after the step (e), cutting portions of said first lead frame to form said gate outer lead and source outer leads; and (g) after the step (e), bending said gate outer lead and source outer leads, wherein a back surface of said header located directly under the drain electrode is exposed from said resin encapsulant.