Patent ID: 6300164
Filing Date: 2001-10-09
Classification: H01L,H05K,Y02P,Y10S,Y10T

Abstract:
A method of fabricating a socketable ball grid array assembly comprising the steps of:applying an electrically conducting adhesive comprising a thermoplastic or thermosetting polymer resin matrix, no clean solder flux, and a plurality of electrically conducting particles with an electrically conductive and fusible coating with at least some of said particles being fused to other said particles through said electrically conductive fusible coating, on to terminal pads of a chip carrier module;aligning and placing the module on an array of conducting spheres in a carrier boat;bonding said spheres to the said terminal pads by means of the said conducting adhesive by applying heat and pressure for a time sufficient to facilitate melting of the said fusible coating and bonding of the said particles to themselves, to the said terminal pads and to the said spheres as well as curing of the said polymer resin to form a strong joint;optionally cleaning the unjoined area of the said spheres to remove any residues;and plugging the said array of spheres into matting sockets in a suitable printed wiring board.