Abstract: A semiconductor device includes a substrate having a first surface and a second surface opposing to the first surface, a semiconductor chip mounted on the first surface of the substrate, a first pad formed on the first surface of the substrate to electrically connect to a first terminal of the semiconductor chip, a second pad formed on the second surface of the substrate to electrically connect to a second terminal of the semiconductor chip, and a decoupling capacitor formed on the first surface and including the first and second pads serving as electrodes of the decoupling capacitor.

Abstract: It is to provide a wiring board for a semiconductor integrated circuit package, which exhibits an excellent signal property and a high effect for decreasing the switching noise at the time of mounting an LSI of an area-array structure. In a multilayer wiring board for a package, which comprises, on a wiring layer of an LSI chip mount surface, a ground pad, a power supply pad, and a signal pad for mounting LSI chip, and a ground plane that extends around a group of those pads, the ground pad disposed on the inner side, among the above-described pads, is connected to the ground plane that surrounds the pad group through a connecting wiring.

Abstract: It is to provide a wiring board for a semiconductor integrated circuit package, which exhibits an excellent signal property and a high effect for decreasing the switching noise at the time of mounting an LSI of an area-array structure. In a multilayer wiring board for a package, which comprises, on a wiring layer of an LSI chip mount surface, a ground pad, a power supply pad, and a signal pad for mounting LSI chip, and a ground plane that extends around a group of those pads, the ground pad disposed on the inner side, among the above-described pads, is connected to the ground plane that surrounds the pad group through a connecting wiring.