The TN1605H-6T from STMicroelectronics is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 140 A, Gate Trigger Voltage 1.3 V, Gate Trigger Current 0.006 A, Temperature Operating Range -40 to 150 Degree C. Tags: Through Hole. More details for TN1605H-6T can be seen below.