An attenuation device for a CAN transceiver comprises two device output nodes configured to electrically couple the attenuation device via the device output nodes between two transceiver terminals of the CAN transceiver. The attenuation device is configured to change from a first device state to a second device state when a common mode voltage is applied to the device output nodes that is either greater than a first reference voltage or less than a second reference voltage that is less than the first reference voltage. The attenuation device causes a first electrical output resistance at each device output node during the first device state and causes a second electrical output resistance at each device output node during the second device state in which the second output resistance is less than the first output resistance.