Patent ID: 6998180

Claim:
A composite component package, comprising: a substrate having a base surface and a joining surface opposite said base surface; at least one semiconductor component joined to said joining surface of said substrate; and an enclosure joined to said substrate; wherein said substrate is a three-layer composite having a first layer facing said enclosure and consisting of Cu or a Cu alloy, a second layer consisting of Mo—Cu, and a third layer consisting of Cu or a Cu alloy, and wherein a thickness s 1 of said first layer and a thickness s 3 of said third layer satisfy the following condition: 1.05<s 3 /s 1 <5; said substrate having a thermal conductivity, transversely to said joining surface, of greater than 170 W/mK; and said substrate having an asymmetrical thermal expansion with a coefficient of thermal expansion of said joining surface differing from a coefficient of thermal expansion of said base surface by at least 2%.