Patent ID: 6490170
Filing Date: 2002-12-03
Classification: H01L,H05K

Abstract:
A package board in the form of a multi-layer wiring board, the package board having a first side and a second side opposed to the first side, comprising:layers of conductor circuits on the first and second sides of the package board, the layers of conductor circuits including, on each of the first and second sides of the package board, inner layers of conductor circuits, the inner layers of conductor circuits being configured and adapted to be one or more of a power supply layer and a ground layer, and outer layers of conductor circuits; insulating layers supporting the outer layers of conductor circuits; via holes formed through the insulating layers on the first and second sides of the package board, the via holes on the first side directly electrically connecting the inner and outer layers of conductor circuits on the first side and the via holes on the second side directly electrically connecting the inner and outer layers of conductor circuits on the second side; soldering bumps on the first and second sides of the package board, the soldering bumps on the first side configured and adapted to be connected to an IC chip and the soldering bumps of the second side configured and adapted to be connected to an outer board, each one of the soldering bumps on the first side disposed in a via hole, and ones of the soldering bumps on the second side disposed in two or more via holes.