The 2N4212HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 25 V, Breakover Current 15 A, Gate Trigger Voltage 0.1 to 1 V, Gate Trigger Current 100 to 300 uA, Temperature Operating Range -65 to 125 Degree C. Tags: Through Hole. More details for 2N4212HR can be seen below.