A near field communications, NFC, device comprising: an antenna having a first antenna terminal and a second antenna terminal; a communications circuit; and a protection circuit (50, 80) coupled to the first and second antenna terminal, the protection circuit for protecting the communications circuit from damaging voltages output by the antenna, wherein the protection circuit comprises: first and second current control means coupled to the first and second antenna terminal respectively; and a controller connected to a common control input of the first and second current control means and configured for outputting a control signal for controlling the first and second current control means, the protection circuit being operative to source or sink current according to a polarity of a voltage that is present at an output of the antenna so as to generate a voltage which reduces the peak voltage present at the output of the antenna, wherein the controller comprises a servo loop connected to the common control input and a plurality of diodes (84,86,88,90,92,94) connected to the common control input and wherein the device is configured to operate in a first mode during which the NFC device is powered and a second mode during which the NFC device is not powered and wherein in the first mode the servo loop is operative to generate the control signal and in the second mode the plurality of diodes are operative to generate the control signal. an antenna having a first antenna terminal and a second antenna terminal; a communications circuit; and a protection circuit (50, 80) coupled to the first and second antenna terminal, the protection circuit for protecting the communications circuit from damaging voltages output by the antenna, wherein the protection circuit comprises: first and second current control means coupled to the first and second antenna terminal respectively; and a controller connected to a common control input of the first and second current control means and configured for outputting a control signal for controlling the first and second current control means, the protection circuit being operative to source or sink current according to a polarity of a voltage that is present at an output of the antenna so as to generate a voltage which reduces the peak voltage present at the output of the antenna, wherein the controller comprises a servo loop connected to the common control input and a plurality of diodes (84,86,88,90,92,94) connected to the common control input and wherein the device is configured to operate in a first mode during which the NFC device is powered and a second mode during which the NFC device is not powered and wherein in the first mode the servo loop is operative to generate the control signal and in the second mode the plurality of diodes are operative to generate the control signal. first and second current control means coupled to the first and second antenna terminal respectively; and a controller connected to a common control input of the first and second current control means and configured for outputting a control signal for controlling the first and second current control means, the protection circuit being operative to source or sink current according to a polarity of a voltage that is present at an output of the antenna so as to generate a voltage which reduces the peak voltage present at the output of the antenna, wherein the controller comprises a servo loop connected to the common control input and a plurality of diodes (84,86,88,90,92,94) connected to the common control input and wherein the device is configured to operate in a first mode during which the NFC device is powered and a second mode during which the NFC device is not powered and wherein in the first mode the servo loop is operative to generate the control signal and in the second mode the plurality of diodes are operative to generate the control signal.