Patent ID: 6534859
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A method for packaging a semiconductor device, forming a Plastic Ball Grid Array (PBGA) package, comprising the steps of:providing Front-Of-Line processing of at least one semiconductor device mounted on a semiconductor device mounting support, said semiconductor device mounting support having a first and a second surface; creating an external layer of mold compound having a first height over the second surface of said semiconductor device mounting support, said external layer of mold compound having been created in a closed loop form at the periphery of said semiconductor device mounting support, said external layer of mold compound having been kept out from said at least one semiconductor device and interconnect wires to said at least one semiconductor device; creating an internal layer of mold compound having a second height over the second surface of said semiconductor device mounting support, said internal layer of mold compound overlying and surrounding said at least one semiconductor device, at least one opening having been provided in said internal layer of mold compound overlying the surface of said at least one semiconductor device, further encasing said at least one semiconductor device and said interconnect wires to said at least one semiconductor device in said internal layer of mold compound, said internal layer of mold compound having been surrounded by said external layer of mold compound, a cavity having been provided between said internal and said external layers of mold compound, said second height being lower than said first height by a measurable amount, external surfaces of said external layer of mold compound intersecting said semiconductor device mounting support under an angle; dispensing layers of thermally conductive epoxy in said opening provided in said internal layer of mold compound and in said cavity provided between said external and said internal layers of mold compound; providing a heat spreader over the surface of said external layer of mold compound, said heat spreader having a first and a second surface, said first surface of said heat spreader facing said at least one semiconductor device, said first surface of said heat spreader having at least one protrusion being aligned with said at least one semiconductor device, thereby converting said internal layer of mold compound into an internal mold cap with reference to said heat spreader, thereby furthermore converting said external layer of mold compound into an external mold cap with reference to said heat spreader; and curing said mold compound concurrent with curing said thermally conductive epoxy.