The Pxxx1DF-1 and Pxxx1DF-1E Series Fixed Voltage Protection SIDACtor^? enhance the reliability of telecom equipment by protecting sensitive SLICs (Subscriber Line Interface Circuits) from damaging overvoltage caused by lightning and AC power faults.  Unlike programmable solutions, the new series do not require a large and costly gate capacitor, and offer a complete single-port overvoltage protection with a single compact device.  The series use a fixed-voltage switching device to protect against both positive and negative induced surge events without the need of additional external components.