Patent ID: 8551882

Claim:
A method of forming a plurality of semiconductors: comprising: forming a plurality of identical semiconductor dice, each die including: a substrate; a plurality of wiring layers and dielectric layers, the dielectric layers separating adjacent ones of the wiring layers, and the wiring layers implementing a circuit; a passivation layer formed on the plurality of wiring layers; a front-side contact pad formed in the passivation layer and electrically coupled to the circuit; and a via stack formed through the plurality of wiring and dielectric layers, the via stack electrically isolated from the circuit implemented by the wiring layers; and for each of a first subset of the plurality of identical semiconductor dice including at least one die, leaving the circuit electrically isolated from the via stack; and for each of a second subset of the plurality of identical semiconductor dice, the second subset being mutually exclusive from the first subset and including at least one die, forming a back-side contact by performing the steps including: forming a first via through the passivation layer and electrically coupled to the via stack; forming a wire on the passivation layer, the wire electrically coupling the front-side contact pad to the first via; and forming a second via extending from a back-side of the substrate and through the substrate, the second via electrically coupled to the via stack.