Patent ID: 8030775

Claim:
A chip assembly comprising: a semiconductor chip comprising a silicon substrate, a first dielectric layer over said silicon substrate, a transistor under said first dielectric layer, a first metal layer over said first dielectric layer, a second metal layer over said first metal layer and said first dielectric layer, a second dielectric layer between said first and second metal layers, a passivation layer over said silicon substrate and said second dielectric layer and on said second metal layer, wherein a first opening in said passivation layer is over a first contact point of said second metal layer, and said first contact point is at a bottom of said first opening, and wherein a second opening in said passivation layer is over a second contact point of said second metal layer, and said second contact point is at a bottom of said second opening, a third metal layer over said passivation layer and on said first and second contact points, wherein said first contact point is connected to said second contact point through said third metal layer, wherein said third metal layer comprises a copper layer with a thickness between 3 and 25 micrometers, a first polymer layer on a top surface and a sidewall of said copper layer and over said passivation layer, wherein a third opening in said first polymer layer is over a third contact point of said copper layer, and said third contact point is at a bottom of said third opening and vertically over said passivation layer, wherein said third contact point is connected to said first contact point through said first opening, and wherein said third contact point is connected to said second contact point through said second opening, and a fourth metal layer on said first polymer layer and said third contact point, wherein said fourth metal layer comprises a wirebondable metal layer over said first polymer layer and said third contact point, wherein said fourth metal layer is connected to said third contact point through said third opening; and a wirebonded copper wire bonded to said wirebondable metal layer, wherein a contact between said wirebonded copper wire and said wirebondable metal layer is not vertically over said first, second and third contact points.