Patent ID: 9119333
Filing Date: 2015-08-25
Classification: H01L,H05K

Abstract:
1. A multilayer wiring board comprising: a build-up layer including a conductor layer and a resin insulation layer that are alternately layered; a conductive pad that is formed so that the whole conductive pad projects from a surface of the build-up layer, the conductive pad having a columnar portion at a lower part thereof and a convex portion at an upper part thereof, a surface of the convex portion of the conductive pad forming a continual curved shape; a barrier metal layer covering the entire conductive pad, a coating thickness of a portion of the barrier metal layer formed on a side end face of the conductive pad situated on the resin insulation layer being greater than a coating thickness of a portion of the barrier metal layer formed on a surface of the conductive pad situated at a higher position than the side end face; and a solder layer covering the entire barrier metal layer that covers the conductive pad.