Patent ID: 7851345

Claim:
A method of making a semiconductor device, comprising: providing a semiconductor die having a bump formed over a surface of the semiconductor die; providing a substrate; forming a contact pad on the substrate; forming a signal trace on the substrate; forming a mask over the signal trace with an opening over the contact pad; forming a surface treatment over the contact pad after forming the mask; removing the mask after forming the surface treatment; forming a film layer over the contact pad with an opening over the signal trace after removing the mask; selectively forming an oxide layer over the signal trace in the opening of the film layer, the film layer and surface treatment preventing formation of the oxide layer over the contact pad; removing the film layer after forming the oxide layer; and reflowing the bump to metallurgically and electrically bond to the contact pad, the oxide layer maintaining electrical isolation between the bump and signal trace in the event that the bump physically contacts the oxide layer over the signal trace.