Patent ID: 8455304

Claim:
A method of forming an integrated circuit assembly, comprising: forming a routable metal layer on a sacrificial base layer, the forming including: patterning the sacrificial base layer with etch-resist to define wire bond pad posts and external connection pad features; etching the patterned sacrificial base layer according to the patterning to form the wire bond pad posts and external connection pad features, where the etch depth is less than a thickness of the sacrificial base layer; stripping etch-resist from the wire bond pad posts; and selectively plating the wire bond pad posts with conductive material to form wire bond pads, including plating only the wire bond posts with conductive material; applying an electrically nonconductive adhesive to the partially etched sacrificial base layer; attaching an integrated circuit die to the routable metal layer using the electrically nonconductive adhesive; attaching wire bond wires coupling circuitry on the die to the wire bond pads; encapsulating at least the die, wire bond pads and the wire bond wires in an electrically nonconductive protective overfill material; and removing the sacrificial base layer that is not encapsulated in the electrically nonconductive protective overfill material to expose the external connection pad features, thus providing external connection pads.