The 2N1884HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 150 V, Breakover Current 15 A, Gate Trigger Voltage 0.40 to 2 V, Gate Trigger Current 0.2 to 2 mA, Temperature Operating Range -65 to 150 Degree C. Tags: Through Hole. More details for 2N1884HR can be seen below.