Patent ID: 8334466
Filing Date: 2012-12-18
Classification: H01L,H05K,Y10T

Abstract:
1. A multilayer printed wiring board comprising: a core substrate; a built-up wiring layer having a first surface in contact with the core substrate and a second surface on an opposite side of the first surface, the second surface of the built-up wiring layer including a mounting area on which at least one semiconductor device is to be mounted, the built-up wiring layer comprising a plurality of conductor circuits and a plurality of insulating resin layers; a plurality of first through-hole conductors formed in a first portion of the core substrate which corresponds to the mounting area of the second surface; a plurality of second through-hole conductors formed in a second portion of the core substrate which corresponds to an area of the second surface other than the mounting area; a plurality of third through-hole conductors formed in a processor core area of the first portion of the core substrate which corresponds to a processor core section of the at least one semiconductor device; and a plurality of pads provided on the second surface, wherein the first through-hole conductors have a pitch which is smaller than a pitch of the second through-hole conductors, and the third through-hole conductors have a pitch which is smaller than the pitch of the first through-hole conductors.