Acoustic volume wave resonator configured to resonate at a predetermined work frequency comprising: - a mounting, comprising a first surface and a second surface, formed by a layer, with a first thickness (s 1), of a first acoustically and electrically insulating material, - a resonating substrate, comprising a first surface and a second surface, made up of at least one layer, with a second thickness (t 1), of a second acoustically resonating material, and - a diaphragm, made up of a layer, with a third thickness (m 1), of a third material, the diaphragm rigidly connecting the second surface of the mounting on the one hand and the first surface of the resonating substrate on the other hand, characterized in that the mounting comprises an internal cavity emerging on the second surface of the mounting, having a floor surface set back in the direction of the thickness of the mounting from the second surface of the mounting, and a planar metal internal electrode, deposited on the floor surface, so as to form a gap area between the internal electrode and a portion of the diaphragm facing it, and in that the resonating substrate is configured by the choice of said second thickness (t 1) so as to create a coupling between an electrostatic mode in the gap area and an extension-compression mechanical mode of a thickness of the resonating substrate so as to generate, between its first surface and its second surface, longitudinal mode acoustic waves vibrating at the work frequency of the resonator, when an electrostatic field having a differential continuous component of high level and a sinusoidal component at the work frequency is generated in the gap area by applying a differential voltage between either the first surface of the resonating substrate and the internal electrode when the resonating substrate is electrically conductive and the diaphragm is electrically insulating, or the diaphragm and the internal electrode when the resonating substrate is electrically insulating and the diaphragm is electrically conducting. - a mounting, comprising a first surface and a second surface, formed by a layer, with a first thickness (s 1), of a first acoustically and electrically insulating material, - a resonating substrate, comprising a first surface and a second surface, made up of at least one layer, with a second thickness (t 1), of a second acoustically resonating material, and - a diaphragm, made up of a layer, with a third thickness (m 1), of a third material, the diaphragm rigidly connecting the second surface of the mounting on the one hand and the first surface of the resonating substrate on the other hand, characterized in that the mounting comprises an internal cavity emerging on the second surface of the mounting, having a floor surface set back in the direction of the thickness of the mounting from the second surface of the mounting, and a planar metal internal electrode, deposited on the floor surface, so as to form a gap area between the internal electrode and a portion of the diaphragm facing it, and in that the resonating substrate is configured by the choice of said second thickness (t 1) so as to create a coupling between an electrostatic mode in the gap area and an extension-compression mechanical mode of a thickness of the resonating substrate so as to generate, between its first surface and its second surface, longitudinal mode acoustic waves vibrating at the work frequency of the resonator, when an electrostatic field having a differential continuous component of high level and a sinusoidal component at the work frequency is generated in the gap area by applying a differential voltage between either the first surface of the resonating substrate and the internal electrode when the resonating substrate is electrically conductive and the diaphragm is electrically insulating, or the diaphragm and the internal electrode when the resonating substrate is electrically insulating and the diaphragm is electrically conducting.