Patent ID: 8378704

Claim:
A substrate for a probe card assembly, comprising: an interconnection layer including a first surface having a plurality of first electrode sets and a second surface having a plurality of second electrode sets electrically connected to the plurality of first electrode sets; a base layer including a first surface having a plurality of third electrode sets electrically connected to the plurality of second electrode sets and a second surface having a plurality of contact terminals electrically connected to the plurality of third electrode sets; and a resin layer including a plurality of sublayers made of different materials, the resin layer being attached to the first surface of the base layer and the second surface of the interconnection layer, wherein the resin layer includes a first sublayer, a second sublayer, and a third sublayer, wherein a thermal expansion coefficient of the third sublayer is lower than a thermal expansion coefficient of the first sublayer and a thermal expansion coefficient of the second sublayer, wherein the third sublayer is disposed between the first sublayer and the second sublayer, wherein the first surface of the base layer is made of ceramic, wherein the second surface of the interconnection layer is made of resin insulating material, wherein the first sublayer is made of a first thermosetting resin material and attached to the second surface of the interconnection layer, and wherein the second sublayer is made of a second thermosetting resin material different from the first thermosetting resin material and attached to the first surface of the base layer.