Patent ID: 8541691
Filing Date: 2013-09-24
Classification: H01L,H05K

Abstract:
1. A circuit wiring board comprising: a wiring board structure; and a heat resistant substrate accommodated in an accommodating portion of the wiring board structure and comprising a core substrate, a built-up wiring layer formed over a first surface of the core substrate, and a second built-up wiring layer formed over a second surface of the core substrate on an opposite side of the first surface, wherein the core substrate and built-up wiring layer of the heat resistant substrate are positioned in the accommodating portion of the wiring board structure, the built-up wiring layer comprises a conductive layer and an interlayer resin insulating layer, the core substrate has a plurality of through hole conductors formed at a pitch and penetrating from the first surface of the core substrate to the second surface of the core substrate, the heat resistant substrate comprises a plurality of connecting pads formed on the second build-up wiring layer, the connecting pads are electrically connected to the plurality of through hole conductors, and the connecting pads are positioned at a pitch which is larger than the pitch of the through hole conductors of the core substrate.