Patent ID: 7160759

Claim:
A method of manufacturing a semiconductor device, which comprises a semiconductor die; a die pad on which the semiconductor die is mounted; a plurality of leads arranged around the semiconductor die; a plurality of wires electrically connecting the semiconductor die and the leads; and a plastic package encapsulating the semiconductor die, the die pad, the plurality of leads, and the plurality of wires, the method comprising the steps of: (a) preparing a lead frame on which patterns including the die pad and the plurality of leads are successively formed, and a terminal protruded in a direction perpendicular to a surface of the lead is formed on each of the surfaces of the plurality of leads; (b) mounting a separate semiconductor die on each of a plurality of die pads formed on the lead frame, and connecting the semiconductor die and the parts of the leads by the use of wires; (c) preparing a molding die having an upper die and a lower die, coating a surface of the lower die with a resin film, and then, mounting the lead frame on the resin film, thereby bringing the terminal formed on the surface of the lead into contact with the resin film; (d) pressing the resin film and the lead frame with the upper die and the lower die to push tip portions of the terminals into the resin film; (e) injecting resin into spaces between the upper and lower dies, thereby encapsulating each of the semiconductor dies along with the die pad, the leads, and the wires corresponding thereto, and separating the lead frame from the molding die after forming a plurality of plastic packages in which the tip portions of the terminals are protruded to the outside; and (f) dicing the lead frame to obtain separate pieces of plastic packages; wherein the terminal formed in the step (a) is a dummy terminal, and, after the step (e), the method further comprises the steps of: removing the dummy terminal; and forming a terminal whose tip portion is protruded to the outside of the plastic package on a surface of the lead in the area where the dummy terminal has been removed.