A protection circuit for use with an electronic digital subscriber line, DSL, component having a tip connection and a ring connection, said protection circuit comprising: a first unidirectional transient-voltage-suppression, TVS, diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between a supply voltage, Vcc, and the tip connection of the DSL component, wherein the first unidirectional TVS array comprises a first TVS diode in series with a first diode which are connected in parallel to another first diode; a second unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the tip connection of the DSL component and a negative ground clamp node, wherein the second unidirectional TVS array comprises a second TVS diode in series with a second diode which are connected in parallel to another second diode; a third unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the supply voltage, Vcc, and the ring connection of the DSL component, wherein the third unidirectional TVS array comprises a third TVS diode in series with a third diode which are connected in parallel to another third diode; a fourth unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the ring connection of the DSL component and the negative ground clamp node, wherein the fourth unidirectional TVS array comprises a fourth TVS diode in series with a forth diode which are connected in parallel to another fourth diode; wherein the tip connection to the supply voltage, Vcc, via the first unidirectional TVS diode array, and the ring connection to the supply voltage, Vcc, via the third unidirectional TVS diode array, forms an electrostatic common mode clamp conduction path so as to provide a negative common mode, CM, negative signal clamp for the supply voltage, Vcc. a first unidirectional transient-voltage-suppression, TVS, diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between a supply voltage, Vcc, and the tip connection of the DSL component, wherein the first unidirectional TVS array comprises a first TVS diode in series with a first diode which are connected in parallel to another first diode; a second unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the tip connection of the DSL component and a negative ground clamp node, wherein the second unidirectional TVS array comprises a second TVS diode in series with a second diode which are connected in parallel to another second diode; a third unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the supply voltage, Vcc, and the ring connection of the DSL component, wherein the third unidirectional TVS array comprises a third TVS diode in series with a third diode which are connected in parallel to another third diode; a fourth unidirectional TVS diode array, having a negative breakdown voltage, BDV, and a diode forward voltage, DV, connected between the ring connection of the DSL component and the negative ground clamp node, wherein the fourth unidirectional TVS array comprises a fourth TVS diode in series with a forth diode which are connected in parallel to another fourth diode; wherein the tip connection to the supply voltage, Vcc, via the first unidirectional TVS diode array, and the ring connection to the supply voltage, Vcc, via the third unidirectional TVS diode array, forms an electrostatic common mode clamp conduction path so as to provide a negative common mode, CM, negative signal clamp for the supply voltage, Vcc.