A support substrate has a face above which at least one electronic component is fixed. A peripheral area of the face includes an annular local metal layer. An encapsulating cover for the electronic component includes a peripheral wall having an end edge that is mounted above the peripheral area. The annular metal local layer includes, at the periphery thereof, a series of spaced-apart teeth with notches formed therebetween. The teeth extend as far as the peripheral edge of the support substrate.