An electronic device includes a support plate having a mounting face. An electronic chip has a front face mounted on the mounting face of the support plate. A rear face of the electronic chip located opposite to the front face is provided with rear grooves that define, between the grooves, rear zones. A rear layer made of a heat-conducting material is spread over the rear face of the electronic chip so as to at least partly cover the rear zones and at least partially fill the rear grooves.