Patent ID: 7191516
Filing Date: 2007-03-20
Classification: H01L,Y10T

Abstract:
1. A method of shielding a space radiation shielded integrated circuit device, wherein the space radiation shielded integrated circuit device comprises a plurality of circuit components, and is adapted for use in space, comprising: forming a first package layer comprising a first circuit package, a copper-tungsten radiation shielding base, a first substrate, a first circuit die, a first lid, whereby the copper-tungsten radiation shielding base shields a bottom portion of the space radiation shielded integrated circuit device against incident radiation; attaching the first circuit die to the first substrate using cyanate ester; soldering the first circuit package to the copper-tungsten radiation shielding base, using a high-temperature copper-silver solder; attaching the first substrate to the first circuit package, using cyanate ester; soldering the first lid to the first package layer, using a high-temperature gold-tin solder; forming a second package layer comprising a second substrate, a second circuit package, a second circuit die and a second copper-tungsten radiation shielding base; attaching the second circuit die to the second substrate, using cyanate ester soldering the second copper-tungsten radiation shielding base to the second circuit package, using a high-temperature copper-silver solder attaching the second substrate to the second circuit package, using cyanate ester, and; soldering a top of the second package layer to a bottom of the first package layer using a high-temperature gold-tin solder, thereby forming electrical interconnects, whereby the first package layer and the second package layer are in electrical communication.