Patent ID: 7837908

Claim:
A method of manufacturing a semiconductor device comprising the steps of: (a) providing a mold having a first mold, a first cavity formed on the first mold, a gate connecting to the first cavity, a flow cavity connecting to the first cavity, and a second mold opposing to the first mold; (b) disposing a lead frame with a semiconductor chip between the first and second molds such that the semiconductor chip is arranged inside of the first cavity, supplying an encapsulating resin into the first cavity through the gate, and sealing the semiconductor chip with the encapsulating resin; and (c) disposing a cleaning sheet between the first and second molds, supplying a cleaning resin into the first cavity through the gate, and cleaning the mold; wherein the first cavity in a plan view is a quadrangle; wherein the gate is connected to a first corner portion; wherein the flow cavity is connected to a second corner portion opposing to the first corner portion via a central portion of the first cavity in a plan view; wherein in the step (b), the encapsulating resin is supplied into the flow cavity via the first cavity; and wherein in the step (c), the cleaning resin is supplied into the flow cavity via the first cavity.