Patent ID: 8309451
Filing Date: 2012-11-13
Classification: H01L

Abstract:
1. A method of making a semiconductor device, comprising: providing a wafer including a plurality of semiconductor dies and plurality of contact pads formed over a surface of the wafer; forming a passivation layer over the wafer and patterning the passivation layer to expose the contact pads; forming an adhesion layer over the passivation layer; forming a seed layer over the adhesion layer, the seed layer electrically connected to the contact pads; depositing a photoresist as a pattern over the seed layer; plating a metal layer within the pattern of the photoresist over the seed layer to form a plurality of regions of the metal layer each separated and arranged by the pattern in the photoresist to be disposed over and electrically connected as a plurality of common voltage busses to respective groups of the contact pads; removing the photoresist to form a channel between the regions of the metal layer extending to the seed layer; removing a portion of the seed layer and the adhesion layer within the channel to expose a portion of the passivation layer and electrically isolate the regions of the metal layer; depositing a wirebondable layer over each of the electrically isolated regions of the metal layer and into the channel extending to the passivation layer after removing the photoresist; and connecting a plurality of wirebonds to the wirebondable layer.