Patent ID: 7537967

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, a second mold opposing to the first mold, the second mold having pots, cavities arranged around the pots, and runners arranged between the pots and the cavities, wherein the first mold has a first main surface, wherein the second mold has a second main surface opposing to the first main surface, wherein the pots are formed on the second main surface of the second mold, and wherein the cavities are connected with the pots by way of the runners, respectively (b) providing the cleaning sheet having an opening, wherein a planar shape of the cleaning sheet is a frame shape; (c) disposing cleaning resin into the pots, respectively; (d) disposing the cleaning sheet between the first mold and the second mold such that the pots, the runners and the cavities are arranged inside of the opening of the cleaning sheet in a plane 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 resins into the cavities from the pots by way of the opening of the cleaning sheet and the runners, respectively; (g) hardening the cleaning resins; (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 by way of the runners, respectively.