Patent ID: 6297564
Filing Date: 2001-10-02
Classification: H01L,H05K,Y02P

Abstract:
An electronic device comprising:a substrate having contact pads thereon, wherein the contact pads are coated with an oxidation-resistant metal;a semiconductor chip having contact pads thereon coated with an oxidationresistant metal, wherein said semiconductor chip is connected in a flip chip manner to said substrate, wherein said substrate and said semiconductor chip have corresponding contact pads, wherein connections between corresponding contact pads on said semiconductor chip and on said substrate are made with a conductive adhesive including:an adhesive selected from the group consisting of thermosetting and thermoplastic polymer adhesives, a blend thereof and a copolymer thereof, wherein the polymer adhesive has a modulus of elasticity of less than 300,000 psi at temperatures above a glass transition temperature of 25.degree. C. or lower and has more than 30% elongation of linear dimension before fracture, anda multiplicity of core particles formed of a material other than a precious metal selected from the group consisting of copper, aluminum, nickel, carbon, graphite, glass, and polymers, wherein said core particles are plated with a precious metal selected from the group consisting of gold, platinum and palladium, and wherein said plating with a precious metal is about 10% to about 30% by weight of the core particle weight.