A device includes a first and second transistors integrated in first and second chips. Each chip has opposed rear and front surfaces, and further has a first conduction terminal and a control terminal on the front surface and a second conduction terminal on the rear surface. The first and second transistors are electrically connected in series by having the first conduction terminals of the first and second transistors be electrically connected. The device includes a common package enclosing the first and second chips, the common package having an insulating body with a mounting surface. A heat sink is also enclosed within the insulating body, the heat sink making electrical contact with the first conduction terminals of the first and second chips on the respective front surfaces, so that the first conduction terminals are electrically connected together through the heat sink.