Patent ID: 8604607

Claim:
A semiconductor module comprising: at least one semiconductor chip; a base frame having a main surface having a concave portion in which said at least one semiconductor chip is mounted, said base frame being thermally and electrically connected with said at least one semiconductor chip; a circuit board having a first grounding pattern and being arranged on said main surface of said base frame; a first lead terminal being integrally formed with said base frame and being connected to said first grounding pattern of said circuit board; and a connection member electrically connecting an outer peripheral portion of said concave portion that is a part of said main surface of said base frame, to said first grounding pattern of said circuit board, and mechanically connecting said base frame to said circuit board, wherein said base frame further includes a heat dissipating surface being located opposite to said main surface and having a convex portion, said semiconductor module further comprises a resin for covering a part of said main surface of said base frame so as to fill said concave portion, and for covering a periphery of said convex portion, said connection member is a screw, a hole through which said screw is passed is formed in each of said outer peripheral portion of said main surface and said first grounding pattern of said circuit board, said semiconductor module further comprises a heat sink being in contact with said convex portion of said heat dissipating surface and fixing said base frame and said circuit board by said screw, and said outer peripheral portion of said main surface is brought into contact with said first grounding pattern by said screw.