The TCR22-6 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 1.5 A, Gate Trigger Voltage 1.5 V, Gate Trigger Current 0.0002 A, Temperature Operating Range -40 to 110 Degree C. Tags: Through Hole. More details for TCR22-6 can be seen below.