The TN2015H-6I from STMicroelectronics is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 180 A, Gate Trigger Voltage 1.3 V, Gate Trigger Current 0.015 A, Temperature Operating Range -40 to 150 Degree C. Tags: Through Hole. More details for TN2015H-6I can be seen below.