Patent ID: 6969674
Filing Date: 2005-11-29
Classification: H01L,H05K

Abstract:
1. A method for making a fine pitch flip chip substrate, comprising the steps of: providing a substrate with a first metal layer, said substrate having a plurality of through holes, and a first metal plated layer on the first metal layer and the through holes; forming an inner circuit on said substrate by etching said first metal layer; forming a black oxide inner circuit by oxidizing said inner circuit; forming a dielectric layer and a second metal layer on said substrate; forming vias in the dielectric layer by drilling to form a plurality of dielectric layer vias, which are plated with a second metal plated layer and then filled with plating filled copper; forming a circuit layer on said second metal layer, said circuit layer including a plurality of bump pad areas; forming a plurality of solder resist areas on said second metal layer outside said bump pad areas; forming a plurality of black oxide dams between said bump pad areas on said second metal layer by oxidization; and packaging a flip chip by underfilling said bump pad areas, and connecting the through holes of the flip chip substrate and said vias of the dielectric layer.