The TYN1212 from STMicroelectronics is a Silicon Controlled Rectifier with Breakover Voltage 1200 V, Breakover Current 120 A, Gate Trigger Voltage 1.3 V, Gate Trigger Current 0.015 A, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for TYN1212 can be seen below.