Abstract: Disclosed is a packaged integrated circuit device with high heat dissipation performance and low weight. The packaged integrated circuit device includes an interconnection substrate having at least one layer of conductive trace material and at least one layer of insulating material and also having a first surface and a second surface disposed opposite to the first surface and having a plurality of electrical contacts formed on the second surface. At least one metal thermal conductive layer having a first surface is attached on the first surface of the interconnection substrate and having a second surface exposed to an exterior. A through hole region is formed in the interconnection substrate and the thermal conductive layer. An integrated circuit chip having a first surface exposed to an exterior and having also a second surface with a plurality of bond pads, opposite to the first surface of the integrated circuit chip, is placed within the through hole region.