Patent ID: 7344061

Claim:
A microelectronic component assembly comprising: a microelectronic component having a first confronting surface bearing a plurality of component electrical terminals formed of a first electrically conductive material; a microelectronic substrate having a second confronting surface bearing a plurality of substrate electrical terminals formed of a second electrically conductive material, the second confronting surface being opposed to the first confronting surface; a plurality of solder balls between the first and second confronting surfaces, each solder ball being attached to a different one of the component electrical terminals and abutting, but not bonded to, one of the substrate electrical terminals, each solder ball comprising: an electrically conductive metal which has a metal flow temperature, the electrically conductive metal being different from the first electrically conductive material and from the second electrically conductive material; and a solid fluxing agent within the solder ball, the fluxing agent having flux activity at a reflow temperature, the fluxing agent being present in an amount efficacious to promote melting of the metal at the reflow temperature after melting of the metal at the metal flow temperature and a subsequent resolidification of the metal.