Patent ID: 7423346
Filing Date: 2008-09-09
Classification: H01L

Abstract:
1. A circuit component with a post-passivation interconnection structure, comprising: a silicon substrate; a transistor in or on said silicon substrate; a first metallization structure over said silicon substrate, wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer; a dielectric layer between said first and second metal layers; a passivation layer over said first metallization structure and over said dielectric layer, wherein said passivation layer comprises a topmost nitride of said circuit component and a topmost oxide of said circuit component, and wherein a first opening in said passivation layer is over a first contact point of said first metallization structure and exposes said first contact point, and a second opening in said passivation layer is over a second contact point of said first metallization structure and exposes said second contact point, wherein there is an insulating layer between said first contact point and said second contact point, and wherein said first contact point is directly over said transistor; a first polymer layer on said passivation layer, wherein said first polymer layer has a thickness between 2 and 150 micrometers; a second metallization structure on said first polymer layer and over said first and second contact points, wherein a first product of resistance of a first section of a metal trace of said second metallization structure times capacitance of said first section is smaller than a second product of resistance of a second section of a metal trace of said first metallization structure times capacitance of said second section by at least 10 times, said first section having a same length as said second section, wherein said second metallization structure connects said first and second contact points, and wherein said second metallization structure comprises a titanium-containing layer, a gold seed layer having a thickness between 300 and 3,000 angstroms on said titanium-containing layer, and a gold bulk layer having a thickness between 1 and 20 micrometers on said gold seed layer, wherein an undercut with an edge of said titanium-containing layer recessed from an edge of said gold bulk layer is between 0.1 and 1 micrometer; and a second polymer layer on said second metallization structure.