Patent ID: 6867122

Claim:
A redistribution process, comprising: providing a wafer having a plurality of bonding pads and a protection layer over a surface of the wafer, wherein the protection layer exposes the bonding pads; forming sequentially a first titanium layer, a first copper layer and a second titanium layer over the surface of the wafer; defining the second titanium layer, the first copper layer and the first titanium layer to form a patterned trace layer which is connected to each of the bonding pads and exposes the protection layer; forming a patterned benzocycloybutene layer over a surface of the patterned trace layer, wherein the patterned benzocyclobutene layer comprises a plurality of first openings that expose the second titanium layer; removing the exposed second titanium layer to expose the first copper layer; and forming a plurality of contacts, which is disposed over the patterned benzocyclobutene layer and connect with the exposed first copper layer, wherein each contact is connected to each of the bonding pads through the patterned trace layer.