The VS-12TTS08SLHM3 from Vishay is a Silicon Controlled Rectifier with Breakover Voltage 800 V, Breakover Current 110 A, Gate Trigger Voltage 0.7 to 1.2 V, Gate Trigger Current 10 to 20 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for VS-12TTS08SLHM3 can be seen below.