Patent ID: 6897093

Claim:
A method of manufacturing a semiconductor device comprising the steps of: providing a lead frame having an upper surface, a lower surface, a frame portion, a plurality of leads which protrude inwardly in the frame portion, and a tub arranged in the frame portion; providing a semiconductor chip having a main surface and a plurality of electrodes on the main surface; fixing the semiconductor chip to an upper surface of the tub; electrically connecting the electrodes of the semiconductor chip with the leads via a plurality of wires; clamping the lead frame between a lower mold and an upper mold so as to form a first resin flow passage, a second resin flow passage, a first air vent passage and a cavity, the semiconductor chip and the wires being arranged in the cavity, the first resin flow passage being connected with the cavity through the second resin flow passage, and the first air vent passage being connected with the cavity, feeding molten resin into the cavity through the first resin flow passage and the second resin flow passage, and forming a resin body having a first portion cured in the first resin flow passage, a second portion cured in the second resin flow passage, a third portion cured in the cavity and fourth portion cured in the first air vent passage, wherein the semiconductor chip and connecting portions of the leads and the wires are sealed in the third portion of the resin body, and wherein lower surfaces of the leads are revealed from the resin body; and cutting the second portion of the resin and the fourth portion of the resin by punching, wherein the first resin flow passage is provided in a groove formed in the upper mold or the lower mold, wherein the second portion of the resin body is formed inside a vertical space bounded by a side of a lead adjacent thereto, and wherein the fourth portion of the resin body is formed inside a vertical space defined by a side of a lead adjacent thereto.