Patent ID: 6831234
Filing Date: 2004-12-14
Classification: H01L,H05K

Abstract:
A multilayer printed circuit board, comprising:a core substrate; multilayer wiring layers formed on the core substrate by alternately laminating interlaminar insulating layer and conductor pattern; a group of solder pads having solder bumps planarly arranged on an outermost surface of the multilayer wiring layers, the group of solder pads including an outer layer pad group and an inner layer pad group; wherein the outer layer pad group includes solder pads located in at least two and up to five rows from an outer position of the solder pad group having flat pads each connected to an outermost conductor pattern located on the outermost surface and having solder bumps formed on surfaces of the solder pads; wherein solder pads other than the solder pads connected to the conductor pattern on the outermost surface form the inner layer pad group; and wherein the inner layer pad group comprises solder pads which are connected to viaholes connected to flat inner layer pads located on one of a first inner layer and at least one further inner layer with solder bumps beings formed in recess portions of the viaholes, the inner layer pad group comprising solder pads located in at least one and up to five rows from an outer position of the inner layer pad group that are connected through the viaholes to flat pads connected to conductor patterns on the first inner layer, while solder pads of the inner layer pad group other than the solder pads connected to flat pads connected to conductor patterns on the first inner layer are connected through the viaholes to flat pads located on the at least one further inner layer located inward relative to the first inner layer.