Patent ID: 7829452
Filing Date: 2010-11-09
Classification: H01L

Abstract:
1. A method, comprising: forming an electrically conductive wire in a dielectric layer on a substrate, said wire comprising an electrically conductive first core conductor and a conformal and electrically conductive first liner only on sidewalls and a bottom surface of said first core conductor; forming a passivation layer on said top surface of said dielectric layer and a top surface of said wire, said wire extending from said top surface of said dielectric layer to a bottom surface of said dielectric layer; forming a trench in said passivation layer, said trench extending from a top surface of said passivation layer to said top surface of said wire; forming a terminal pad comprising an electrically conductive second core conductor and an electrically conductive second liner on sidewalls and the bottom of said trench, said second core conductor filling all portions of said trench not filled by said second liner, a top surface of said terminal pad coplanar with a top surface of said passivation layer, a first perimeter defined by all sides of said terminal pad aligned entirely within a second perimeter defined by all sides of said wire; forming a ball-limiting-metallurgy pad on a top surface of said terminal pad and extending past all sides of said terminal pad; and forming a solder bump on a top surface of said ball-limiting-metallurgy pad.