Patent ID: 6483185
Filing Date: 2002-11-19
Classification: H01L

Abstract:
A power module substrate, comprising:a ceramic substrate having a circuit pattern formed on a surface thereof, and a metal frame provided on a periphery of the ceramic substrate and so structured that the ceramic substrate can be joined to a water-cooling type heat sink; wherein the metal frame has a thickness equal to that of the ceramic substrate having the circuit pattern, and is provided with plural perforations formed so as to sandwich the ceramic substrate, and metal thin sheets having through-holes in communication with said plural perforations, and containing contacting portions, said contacting portions having an underside contacted to at least a part of a circumferential surface of the ceramic substrate or the circuit pattern disposed on the surface of the metal frame, whereby the ceramic substrate having the circuit pattern formed thereon and contacted to the undersides of the contacting portions can be joined to the water-cooling type heat sink by inserting male screws through the through-hole and the perforations, and screwing the male screws in female screws formed in the water-cooling type heat sink or further inserting the male screws through attachment holes formed in the water-cooling type heat sink and screwing the male screws in nuts, respectively.