Patent ID: 7868451

Claim:
A resin sealing semiconductor device having a structure in which a portion to be sealed of components including at least one chip mounting board having a front surface that is a chip mounting surface and a back surface that is at least partly an exposed surface, a semiconductor chip mounted to the front surface of each chip mounting board, and a plurality of leads provided correspondingly to each chip mounting board and having inner lead portions connected to an electrode of the semiconductor chip on the corresponding chip mounting board via a connecting wire is embedded in a resin molded portion molded into a generally plate shape, and outer lead portions of said plurality of leads are led out in line from a side surface at one end in a width direction of said resin molded portion, and the exposed surface of each chip mounting board is placed on one surface of said resin molded portion, wherein a plurality of positioning protrusions are provided integrally with said resin molded portion on one surface of said resin molded portion, and a protrusion height of said positioning protrusions is set so that a gap to be filled with insulating resin is formed between each part of the exposed surface of each chip mounting board and a radiator plate when said positioning protrusions are abutted against the radiator plate.