The VS-16TTS12-M3 from Vishay is a Silicon Controlled Rectifier with Breakover Voltage 1200 V, Breakover Current 200 A, Gate Trigger Voltage 1 to 3 V, Gate Trigger Current 35 to 90 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for VS-16TTS12-M3 can be seen below.