Patent ID: 6897097

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: providing a lead frame having a front face, a back face opposed of the front face, a tub and a plurality of leads arranged around the tub wherein a back face of the tub is etched off and each of the leads is thicker than the tub; providing a semiconductor chip having a principal face, a back face and a plurality of electrodes formed on the principal face; bonding the back face of the semiconductor chip on the front face of the tub; electrically connecting the plurality of electrodes with the plurality of leads via a plurality of wires, respectively; providing a molding die having an upper part and a lower part wherein the lower part has a cavity; arranging the lead frame between the upper part and the lower part as the bonded semiconductor chip is positioned in the cavity of the lower part and the back face of the tub is facing the upper part; and after the arranging step, injecting a resin in the cavity for sealing the semiconductor chip, the tub, the plurality of wires, and a part of each of the plurality of leads in the resin, wherein the back face of the tub is entirely sealed by the resin, and wherein a part of the resin which covers the back face of the tub is thinner than the leads.