The TN4015H-6G from STMicroelectronics is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 360 A, Gate Trigger Voltage 1.3 V, Gate Trigger Current 0.015 A, Temperature Operating Range -40 to 150 Degree C. Tags: Surface Mount. More details for TN4015H-6G can be seen below.