Patent ID: 6054761
Filing Date: 2000-04-25
Classification: H01L,H05K

Abstract:
An multi-layer circuit substrate comprising:a first circuitized structure having a conducting region;a second circuitized structure having a conducting region;a dielectric layer disposed between the first and second circuitized structures and having an aperture; anda via structure including a conductive composition in a cured state disposed within the aperture and electrically communicating with the conducting regions of the first and second circuitized structures, said conductive composition comprising:conductive particles in an amount of at least about 75 wt. % based on the weight of the composition, wherein at least 50% by weight of the conductive particles have melting points of less than about 400.degree. C.; anda carrier including an epoxy-functional resin in an amount of at least about 50 wt. % based on the weight of the carrier, the epoxy functional resin having a viscosity of less than about 1000 centipoise at 25.degree. C., and a fluxing agent in an amount of at least about 0.1 wt % based on the weight of the carrier.