Patent ID: 7573138
Filing Date: 2009-08-11
Classification: H01L

Abstract:
1. An integrated circuit chip having an active surface and a plurality of contact pads on the active surface, the chip comprising: an elastic polymer layer provided over the active surface of the integrated circuit chip; a plurality of under-ball-metallurgy pads provided on the elastic polymer layer; a plurality of conductive metal posts provided in the elastic polymer layer, each of the metal posts extending between one of the contact pads on the active surface of the chip and one of the under-ball-metallurgy pads, wherein the plurality of conductive metal posts are arranged in an array in which the conductive metal posts have center-to-center pitch of 200 to 100 μm and post diameter of 100 to 50 μm; and a solder bump provided on each of the under-ball-metallurgy pads, wherein the solder bumps are used to provide electrical interconnection to a chip carrier when the chip is assembled into an electronic package assembly.