Patent ID: 8451619
Filing Date: 2013-05-28
Classification: H01L,H05K,Y10T

Abstract:
1. A printed wiring board including at least one power supply wiring region and a ground wiring region in a predetermined free area provided on a signal layer thereof, wherein the signal layer is interposed between a power supply layer and a ground layer through respective insulating layers, wherein a region on the signal layer corresponding to a region extended in four directions from a bottom center portion of a semiconductor device mounted on said printed wiring board is set to the free area which includes at least one of the wiring region for the power supply re ion and the ground wiring region, and wherein the semiconductor device including a plurality of electrodes is mounted on a bottom surface facing a component surface of said printed wiring board; said component surface of said printed wiring board includes a plurality of pads for being connected with said electrodes of the semiconductor device, respectively, and through holes connected to said pads, respectively, are arranged in a periphery side of the semiconductor device with respect to said pads; and the region on the signal layer corresponding to the region extended in the form of a cross corresponding to vertical and horizontal center lines of said bottom surface of the semiconductor device is set to the free area.