The 2N6397TG from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 12 A, Gate Trigger Voltage 1.5 V, Gate Trigger Current 0.03 A, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for 2N6397TG can be seen below.