Patent ID: 6462414
Filing Date: 2002-10-08
Classification: H01L,H05K,Y10T

Abstract:
A substrate comprising:a dielectric layer comprising a first surface, a second surface, and a third surface that extends from a plane of the second surface to the first surface at an angle greater than ninety degrees, a via, and a first thickness between the first surface and the second surface; and a conductive ball pad comprising a first portion and a second portion, wherein the conductive ball pad is positioned to permit electrical coupling through the via to a conductive ball, wherein the first portion defines a planar interface for the conductive ball, and wherein the second portion of the conductive ball pad defines a curved interface for the conductive ball that does not contact the third surface, and wherein the second portion extends a second thickness through the via in a direction of a plane of the first surface beyond the first surface of the dielectric layer and to about half of a height or less of the conductive ball.