Patent ID: 9204541
Filing Date: 2015-12-01
Classification: H01L,H05K,Y02P,Y10T

Abstract:
1. A multilayer circuit board, comprising: a plurality of resin layers stacked on one another, each of the resin layers including a resin sheet with at least one via-hole conductor and a conductive wiring layer disposed on at least one surface of the resin sheet, wherein each of the via-hole conductors contains an intermetallic compound comprising a reaction product between a first metal and a second metal, and wherein the first metal is selected from the group consisting of Sn and an alloy containing at least 70% by weight of Sn, and the second metal is selected from the group consisting of a Cu—Ni alloy and a Cu—Mn alloy, the second metal having a higher melting point than the first metal.