Patent ID: 7112521

Claim:
A method of making a semiconductor chip assembly, comprising: providing a metal base, a routing line and a bumped terminal, wherein the routing line and the bumped terminal are contiguous with one another and contact the metal base, the routing line is disposed outside a recess in the metal base, and the bumped terminal extends into the recess and includes a cavity that extends into and faces away from the recess; then mechanically attaching a semiconductor chip to the metal base, the routing line and the bumped terminal, wherein the chip includes first and second opposing surfaces, and the first surface of the chip includes a conductive pad; forming a connection joint that electrically connects the routing line and the pad; forming an encapsulant after attaching the chip to the metal base, the routing line and the bumped terminal, wherein the encapsulant includes a first surface that faces in a first direction and a second surface that faces in a second direction opposite the first direction, the encapsulant covers the chip and extends vertically beyond the chip, the metal base, the routing line and the bumped terminal in the first direction, the chip is embedded in the encapsulant, the metal base extends vertically beyond the chip, the routing line and the bumped terminal in the second direction, the bumped terminal extends vertically beyond the routing line in the second direction and the cavity faces in the first direction; and etching the metal base after forming the encapsulant, thereby reducing contact area between the metal base and the routing line and forming a metal pillar from an unetched portion of the metal base that contacts the bumped terminal and extends vertically beyond the chip, the routing line, the bumped terminal and the encapsulant in the second direction.