Patent ID: 7943432

Claim:
A method of manufacturing a semiconductor device by using a cleaning sheet for cleaning a molding die, comprising the steps of: (a) providing the molding die having a first mold, and a second mold opposing to the first mold, wherein the second mold has pots and cavities arranged next to the pots, wherein the first mold has a first main surface, wherein the second mold has a second main surface opposing to the first main surface, and wherein the cavities are formed on the second main surface of the second mold; (b) providing the cleaning sheet having an opening; (c) disposing cleaning resin into the pots, respectively; (d) disposing the cleaning sheet between the first mold and the second mold such that the cavities are arranged inside of the opening of the cleaning sheet in a plan view; (e) clamping the cleaning sheet with the first main surface of the first mold and the second main surface of the second mold; (f) supplying the cleaning resin into the cavities from the pots by way of the opening of the cleaning sheet; (g) hardening the cleaning resin; (h) releasing the cleaning sheet from between the first mold and the second mold, wherein the hardened cleaning resin is attached to the cleaning sheet; (i) disposing encapsulating resin into the pots; (j) disposing semiconductor chips in the cavities, respectively; and (k) supplying the encapsulating resin into the cavities from the pots.