Patent ID: 9693453
Date: 2017-06-27
CPC Classifications: H01L,H05K

Claim:
1. A wiring board, comprising: an electrically insulating base layer; a plurality of conductive connection terminals formed on the base layer; and an electrically insulating surface layer filling gaps between the plurality of connection terminals on the base layer, the electrically insulating surface layer formed in a state in which the connection terminals are exposed therefrom with an upper surface of the electrically insulating surface layer lower than a top surface of the plurality of conductive connection terminals, wherein the connection terminals include: a base portion made of a conductive first metal that includes copper, and a coating portion made of a conductive second metal that is different from the first metal, and that penetrates the electrically insulating surface layer and coats the base portion to the base layer; wherein the base portion is a copper-plated layer; and wherein progress of migration of the second metal occurring between the respective connection terminals in the plurality of connection terminals is slower than migration of the first metal.