Patent ID: 7094676

Claim:
A method of making a semiconductor chip assembly, comprising: providing a metal base with first and second opposing surfaces; then forming an etch mask on the first surface of the metal base; forming a routing line on the second surface of the metal base; then etching the metal base, wherein an unetched portion of the metal base defined by the etch mask forms a pillar that includes first and second opposing surfaces, the first surface of the pillar faces away from the routing line and contacts the etch mask, and the second surface of the pillar contacts the routing line; then mechanically attaching a semiconductor chip to the routing line and the pillar, wherein the chip includes first and second opposing surfaces, the first surface of the chip includes a conductive pad, the first surface of the pillar faces in a first direction, the second surface of the pillar faces in a second direction opposite the first direction, the chip extends vertically beyond the routing line in the first direction, the pillar is disposed outside a periphery of the chip and extends vertically beyond the routing line in the first direction, and the routing line extends laterally from the pillar towards the chip; forming an encapsulant that covers the chip and extends vertically beyond the chip and the routing line in the first direction, wherein the encapsulant includes a first surface that faces in the first direction and a second surface that faces in the second direction, and the chip and the pillar are embedded in the encapsulant; and forming a connection joint that electrically connects the routing line and the pad, wherein a conductive trace that includes the routing line and the pillar is electrically connected to the pad and extends through the first surface of the encapsulant.