Patent ID: 6228678
Filing Date: 2001-05-08
Classification: H01L

Abstract:
A method of making an integrated circuit assembly which comprises the steps of:a) providing a substrate having at least one solderable contact site on a surface thereof;b) applying an underfill material to the substrate surface in a manner which substantially entirely covers the substrate surface and the solderable contact site;c) treating the underfill material to form at least one aperture therein, the at least one aperture extending substantially entirely through the underfill material and being located such that it exposes only the solderable contact site;d) applying at least one solder bump to the assembly in a manner such that a bump occupies each aperture in the underfill, contacts the exposed solderable contact site therein, and extends above the underfill material; ande) applying a flux to the surface, the flux covering at least the exposed portions of the solder bumps.