Switching device of a power circuit comprising: - two switching terminals (2a, 2b); - a high-voltage depletion mode transistor and a low-voltage enhancement mode transistor arranged in series between the two switching terminals (2a, 2b); the device being characterized in that it comprises: - a control circuit having a first input for receiving a switching signal and a second input for receiving an activation signal from the device, the control circuit being designed to put the switching device: ▪ in an inactive state when the activation signal has a first level, in which the low-voltage transistor and the high-voltage transistor are each turned off; ▪ and in an active state when the activation signal has a second level, which is different from the first, in which the low-voltage transistor is turned on and the switching signal applied to the gate of the high-voltage transistor; - a driver circuit for applying the switching signal to the gate of the high-voltage transistor, the driver circuit being supplied with a first voltage from a first voltage source (VDR+) and with a second voltage from a second voltage source (VDR-), the first and the second voltage being higher and lower, respectively, than the threshold voltage of the high-voltage transistor; - at least one programming module (15, 15a, 15'a, 15b, 15'b) associated with the driver circuit, said module being designed to allow programming of the incoming current (I +) intended to be injected into the gate of the high-voltage transistor, and of the outgoing current (I -) intended to be drawn from said gate; it being possible for the programming module to be connected to a first and a second passive component for programming the incoming current (I +) and the outgoing current (I -), respectively. - two switching terminals (2a, 2b); - a high-voltage depletion mode transistor and a low-voltage enhancement mode transistor arranged in series between the two switching terminals (2a, 2b); - a control circuit having a first input for receiving a switching signal and a second input for receiving an activation signal from the device, the control circuit being designed to put the switching device: ▪ in an inactive state when the activation signal has a first level, in which the low-voltage transistor and the high-voltage transistor are each turned off; ▪ and in an active state when the activation signal has a second level, which is different from the first, in which the low-voltage transistor is turned on and the switching signal applied to the gate of the high-voltage transistor; ▪ in an inactive state when the activation signal has a first level, in which the low-voltage transistor and the high-voltage transistor are each turned off; ▪ and in an active state when the activation signal has a second level, which is different from the first, in which the low-voltage transistor is turned on and the switching signal applied to the gate of the high-voltage transistor; - a driver circuit for applying the switching signal to the gate of the high-voltage transistor, the driver circuit being supplied with a first voltage from a first voltage source (VDR+) and with a second voltage from a second voltage source (VDR-), the first and the second voltage being higher and lower, respectively, than the threshold voltage of the high-voltage transistor; - at least one programming module (15, 15a, 15'a, 15b, 15'b) associated with the driver circuit, said module being designed to allow programming of the incoming current (I +) intended to be injected into the gate of the high-voltage transistor, and of the outgoing current (I -) intended to be drawn from said gate; it being possible for the programming module to be connected to a first and a second passive component for programming the incoming current (I +) and the outgoing current (I -), respectively.