TISP6NTP2CDR-S is a quad forward-conducting P-gate thyristor designed as a programmable overvoltage protector for high-voltage ringing SLIC (Subscriber Line Interface Circuit) applications. The device provides independent tracking overvoltage protection for two SLIC lines with dual voltage-programmable protectors, supporting battery voltages down to -155 V and featuring a low 5 mA maximum gate triggering current and high 150 mA minimum holding current at 70°C. It is rated for common impulse waveforms including 10/1000 µs (25 A), 10/700 µs (40 A), and 2/10 µs (90 A) peak pulse surge currents, with a specified 2/10 limiting voltage and full operating temperature range of 0°C to 70°C. The device protects against overvoltages caused by lightning, AC power contact, and induction in short loop systems such as WILL, FITL, DAML, SOHO, and ISDN terminal adapters, offering both positive overvoltage clipping via antiparallel diode conduction and negative overvoltage suppression through thyristor regeneration.