Patent ID: 6800815
Filing Date: 2004-10-05
Classification: H01L,H05K,Y10T

Abstract:
A ceramic circuit structure having a plurality of ceramic layers, wherein a first one of the ceramic layers comprises:a through-hole that passes through the first ceramic layer, the through-hole being filled with a first electrically conductive material, which forms a via; a contact pad formed on a surface of the first ceramic layer, the contact pad formed from a second electrically conductive material that is different from the first electrically conductive material; a barrier cap formed in contact with and between the via and the contact pad such that the barrier cap is encapsulated within the first ceramic layer, the barrier cap being formed from a third electrically conductive material that is different from the first and second electrically conductive materials; and a dielectric ring covering a peripheral portion of the contact pad and an adjacent portion of the dielectric material layer surface immediately surrounding the contact pad, such that any solder that is applied to the contact does not contact the peripheral portion of the contact pad or the ceramic material.