A FET includes elongated, mutually parallel source regions separated by gate and drain regions. Conductive bridges extend over the gate and drain regions and not in electrical contact therewith to electrically and thermally interconnect the sources. A layer of dielectric is applied over surfaces, and an aperture is defined over the bridges. A thick layer of metal is applied over and in thermal and electrical contact with the bridges. Electrical and thermal connections can be made to the thick metal.