Abstract: Voltage regulator, in particular for an alternator, comprising a connector designed to perform the function of a communication interface between the alternator and a control unit of an engine to which the alternator is connected; a capacitor designed to be connected to the alternator, for performing the function of an anti-noise filter at radio frequencies; a processing module designed to be connected to the alternator, for managing operation thereof; a heat sink designed to dissipate the heat of the regulator; the regulator wherein it comprises a casing which is designed to be connected to the alternator and defines a main cavity designed to house the connector and a secondary cavity which is adjacent to the main cavity and designed to house the capacitor; the casing is able to be fixed to the alternator by means of four mechanical connection elements, two of said connection elements being connected to the capacitor, a third one being connected and screwed to a brush holder of the alternator and a fourth one