Patent ID: 7394159
Filing Date: 2008-07-01
Classification: H01L,H05K

Abstract:
1. A substrate, comprising: a first dielectric layer including a dielectric surface; a conductive pad on the dielectric surface of the first dielectric layer, the conductive pad having an anchor structure and a first, a second, and a third surface, the first surface being a planar surface and parallel with the dielectric surface of the first dielectric layer, the second and third surfaces intersecting the first surface of the conductive pad and the dielectric surface of the first dielectric layer and being entirely orthogonal to the first surface of the conductive pad between the first surface of the conductive pad and the dielectric surface of the first dielectric layer; a second dielectric layer disposed at least on a portion of the dielectric surface of the first dielectric layer, the second dielectric layer having a first surface, a second surface opposite of the first surface, and a third surface intersecting the first and second surfaces of the second dielectric layer and defining, at least in part, a via hole within where the conductive pad is disposed on the dielectric surface, the second surface of the second dielectric layer being disposed at least on the portion of the dielectric surface of the first dielectric layer, the second dielectric layer having a height that is greater than a height of the conductive pad, the height of the conductive pad being the distance between the first surface of the conductive pad and the dielectric surface of the first dielectric layer, the height of the second dielectric layer being the distance between the first and the second surface of the second dielectric layer; and a via filling the via hole and extending from the first surface of the conductive pad down to portions of the dielectric surface of the first dielectric layer not covered by the conductive pad, the via being in contact with the first surface of the conductive pad, an entire length of the second surface of the conductive pad from the first surface of the conductive pad to dielectric surface of the dielectric layer, and an entire length of the third surface of the conductive pad from the first surface of the conductive pad to the dielectric surface of the dielectric layer wherein the second and the third surfaces of the conductive pad are configured such that the second surface entirely surrounds the third surface.