Patent ID: 6258314
Filing Date: 2001-07-10
Classification: B29C,H01L

Abstract:
A method for manufacturing a resin-molded semiconductor device comprising the steps of:(a) preparing a lead frame having an inner lead portion and a die pad portion, a semiconductor chip being bonded on the die pad portion;(b) attaching a sealing sheet at least to a bottom face of the inner lead portion of the lead frame;(c) placing the lead frame between upper and lower molds such that the sealing sheet is interposed between the lower mold and the lead frame;(d) applying tension to the sealing sheet so as to prevent wrinkles from being formed on the sealing sheet;(e) pressing the inner lead portion of the lead frame to force the bottom face of the inner lead portion of the lead frame into the sealing sheet; and(f) encapsulating the lead frame with a molding compound during the steps (d) and (e) to form a resin molding such that the bottom face of the inner lead portion protrudes from a bottom face of the resin molding and the inner lead portion functions as an external electrode,wherein the step of applying tension to the sealing sheet does not directly apply tension to portions of the sealing sheet which are adjacent to interior areas of said resin-molded semiconductor device.