Patent ID: 6525275
Filing Date: 2003-02-25
Classification: H01L,H05K

Abstract:
A multilayer printed circuit board, comprising:a core substrate; multilayer wiring layer formed on the core substrate by alternately laminating at least one interlaminar insulating layer and conductor pattern; and a solder pad group comprising two-dimensionally arranged pads having solder bumps on a surface of the multilayer wiring layer; wherein the two-dimensionally arranged pads of the solder pad group are arranged in only a peripheral portion other than a central portion to form a frame shape; wherein solder pads located at an outside part of the frame shape have flat pads connected to the conductor pattern, the flat pads and conductor pattern being on a same surface of one of the at least one interlaminar insulating layer, and wherein the solder bumps of the solder pads located at the outside part of the frame shape are formed on surfaces of the flat pads, the solder pads located at the outside part of the frame shape being located in at least two and up to five rows from an outermost periphery of the frame shape; and wherein solder pads located at an inside part of the frame shape have viaholes which are each connected to an innerlayer flat pad group located in an innerlayer, and wherein the solder bumps of solder pads located at the inside part for the frame shape are in recess portions of the viaholes.