Patent ID: 7576423

Claim:
A semiconductor device comprising: a metallic base plate; a semiconductor element arranged on the base plate, at least a first dielectric plate, arranged on the base plate, having a surface on which a circuit pattern is formed; a frame-shaped sidewall, provided on the base plate, surrounding the dielectric plate and the semiconductor element; a power supply portion including insulator forming a part of the sidewall; a band-shaped conductor provided at a higher position than the surface of the first dielectric plate with respect to a main surface of the base plate, wherein the conductor penetrates through the power supply portion; and a relay post provided on the dielectric plate; wherein the relay post includes: an insulator block, at a center portion of which a VIA hole is formed in a vertical direction; a VIA metal filled in the VIA hole, one end of which is connected to the circuit pattern and another end of which is extended to a higher position than the surface of the dielectric plate; and a conductor layer, provided on a surface of the insulator block, surrounding the VIA metal, and wherein the first band-shaped conductor is connected to the circuit pattern by an interconnection via the relay post.