Patent ID: 9615442
Date: 2017-04-04
CPC Classifications: H01L,H05K

Claim:
1. A power-module substrate, comprising: first and second sets of circuit-layer metal-plates made of copper or copper alloy bonded in a layered state to top and bottom surfaces, respectively, of a first ceramic substrate; a metal member connecting the first and second sets of circuit-layer metal-plates and extending through a hole formed in the first ceramic substrate; a second ceramic substrate bonded at a top surface thereof to a bottom surface of the second set of circuit-layer metal-plates in the layered state; a heat-radiation-layer metal-plate made of aluminum or aluminum alloy bonded to a bottom surface of the second ceramic substrate; an electric component attached to a top surface of one of the first set of circuit-layer metal-plates above the metal member and the through hole; a lead-terminal part for external connection protruding outward from the first ceramic substrate formed integrally on the second set of circuit-layer metal-plates; and a protrusion part of the second ceramic substrate protruding outward from the first ceramic substrate in a surface direction and supporting at least a part of the lead-terminal part at a top surface thereof, wherein the power-module substrate is configured to conduct heat from the electric component through the through hole via the metal member, along the second set of circuit-layer metal-plates, and to the heat-radiation-layer metal-plate.