Patent ID: 6946329

Claim:
A method of connecting a semiconductor chip die having an array of conductive pads on one surface thereof to a circuit card having a corresponding array of conductive pads, comprising the steps of: forming a flexible interposer to electrically connect said chip die to a circuit card by forming an array of metal plated vias in a layer of flexible material positioned to correspond to said array of conductive pads on said chip die with each via terminating on opposing surfaces of said layer of flexible material in metal connection pads; attaching first solder bumps to each pad of said array of conductive pads on said one surface of said chip die; positioning said flexible interposer so as to align and contact said array of metal pads on one surface of said flexible material with said first solder bumps attached to said conductive pads on said chip die; heating said first solder bumps to melt and draw said solder into each of said metal plated vias to fill said vias to said metal pads on the other surface of said flexible material and electrically attach said array of metal pads on said one surface of said array of conductive pads on said chip die; attaching second solder bumps to each pad of said metal pads on said other surface of said flexible material; positioning the said array of conductive pads on said circuit card so as to align and contact said second solder bumps attached to said metal pads on said other surface of said flexible material; and applying heat to said second solder bumps attached to the said metal pads on said other surface of said flexible material so as to melt said second solder bumps to electrically attach said array of metal pads on said other surface to said array of conductive pads on said circuit card.