Patent ID: 6465338
Filing Date: 2002-10-15
Classification: H01L,H05K

Abstract:
A method of planarizing an array of plastically-deformable electrical contacts on an integrated circuit, the method comprising the steps of:placing the integrated circuit on a plate having a plurality of holes, with the array of plastically-deformable electrical contacts substantially parallel to and facing the plate, thereby creating an assembly, and heating the assembly sufficiently to cause individual ones of the plastically-deformable electrical contacts to locally soften but not to cause said individual ones of the electrical contacts to liquefy throughout their volumes, the heating accomplished by applying hot gas through the holes in the plate, wherein the step of heating the assembly is performed at least partially when the integrated circuit is above the plate such that the weight of the integrated circuit bears down on the array of plastically-deformable electrical contacts, thereby selectively distorting said electrical contacts so they cooperatively define a planar array.