The 2N1875HR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 15 V, Breakover Current 15 A, Gate Trigger Voltage 0.44 to 0.60 V, Gate Trigger Current 5 to 20 µA, Temperature Operating Range -65 to 150 Degree C. Tags: Through Hole. More details for 2N1875HR can be seen below.