The STYN1665 from Sirectifier Electronics is a Silicon Controlled Rectifier with Breakover Voltage 1600 V, Breakover Current 460 to 560 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 STYN1665 can be seen below.