Patent ID: 7901993

Claim:
A method of making a semiconductor chip assembly, comprising: providing a post, a base, an adhesive and a copper layer, wherein the post is adjacent to the base, extends above the base in an upward direction, extends into an opening in the adhesive, is aligned with an aperture in the copper layer and is aluminum, the base extends below the post in a downward direction opposite the upward direction, extends laterally from the post in lateral directions orthogonal to the upward and downward directions and is aluminum, the adhesive is mounted on and extends above the base, is sandwiched between the base and the copper layer and is non-solidified, and the copper layer is mounted on and extends above the adhesive; then flowing the adhesive into and upward in a gap located in the aperture between the post and the copper layer; solidifying the adhesive; then providing a conductive trace that includes a pad and a terminal, wherein the conductive trace further includes a silver coating and a copper core, the silver coating is located above and overlaps the copper core, and the copper core is a selected portion of the copper layer that is coplanar with the post and the adhesive at a lateral surface that includes the post, the adhesive and the copper core and faces in the upward direction; then mounting a semiconductor device on the post, wherein an aluminum heat spreader includes the post and the base and the semiconductor device is mounted on and overlaps the post; electrically connecting the semiconductor device to the pad, thereby electrically connecting the semiconductor device to the terminal; and thermally connecting the semiconductor device to the post, thereby thermally connecting the semiconductor device to the base.