Patent ID: 6984576

Claim:
A method of connecting a conductive trace and an insulative base to a semiconductor chip, comprising: providing a semiconductor chip, a metal base, an insulative base, a routing line and an interconnect, wherein the chip includes a conductive pad, the metal base is disposed on a side of the insulative base that faces away from the chip, the routing line is disposed on a side of the insulative base that faces towards the chip, and the interconnect extends through a via in the insulative base and electrically connects the metal base and the routing line; then etching the metal base such that an unetched portion of the metal base forms a pillar that overlaps and is aligned with the via and contacts the interconnect, wherein a conductive trace includes the routing line, the interconnect and the pillar; forming an opening that extends through the insulative base and exposes the pad; and forming a connection joint that electrically connects the routing line and the pad.