An electronic device includes a substrate wafer made of many layers of an insulating material and including an electrical connection network. An integrated circuit chip is mounted to a top side of the substrate wafer. The substrate wafer further includes a metal plate that is integrated into the substrate wafer and thermally coupled to the integrated circuit chip. The metal plate may have a thickness in excess of several layers of the substrate wafer. The metal plate may include a duct through which a thermally conductive fluid flows.