Patent ID: 7408261
Filing Date: 2008-08-05
Classification: H01L,H05K,Y10T

Abstract:
1. A Ball Grid Array (BGA) package board, comprising: a first external layer on which a pattern comprising a circuit pattern and a wire bonding pad pattern are formed; a second external layer on which a pattern comprising a circuit pattern and a solder ball pad pattern are formed; an insulating layer formed between the first and second external layers; a first outer via hole to electrically connect the first and second external layers to each other; and a solder resist layer formed on each of the first and second external layers, with portions of the solder resist layer corresponding to the wire bonding pad pattern and the solder ball pad pattern being opened; wherein the solder ball pad pattern is composed of a partially etched portion of an originally formed pattern of the second external layer, and the circuit pattern of the second external layer is composed of the originally formed pattern of the second composed layer resulting in the solder ball pad pattern having a reduced thickness as compared with the circuit pattern of the second external layer.