Patent ID: 7977157
Filing Date: 2011-07-12
Classification: H01L

Abstract:
1. A method of assembling an integrated circuit package, comprising: providing a semiconductor die comprising integrated circuitry, the die comprising electrically conductive bond pad regions and electrically conductive caps over an entirety of the bond pad regions; providing an interposer having electrically conductive projections; bonding gold-containing balls directly to the electrically conductive caps; after bonding the gold-containing balls directly to the electrically conductive caps, forming z-axis conductive material over and between the gold-containing balls; the z-axis conductive material entirely surrounding exposed surfaces of the gold-containing balls; pressing the electrically conductive projections through the z-axis conductive material to directly contact the gold-containing balls; the z-axis conductive material being in a non-conductive form as the z-axis conductive material is formed over and between the gold-containing balls; some of the z-axis conductive material being compressed when the electrically conductive projections are pressed through the z-axis conductive material and being transformed to a conductive form; the conductive form of the z-axis conductive material being directly adjacent the gold-containing balls; bonding the electrically conductive projections directly to the gold-containing balls; and utilizing vibrational energy having a frequency of at least about one kilohertz during the bonding of the electrically conductive projections to the gold-containing balls.