The STO1875 from Sirectifier Electronics is a Silicon Controlled Rectifier with Breakover Voltage 1800 V, Breakover Current 480 to 580 A, Gate Trigger Voltage 1.5 to 1.6 V, Gate Trigger Current 100 to 200 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for STO1875 can be seen below.