The DG758BX45 from Dynex Semiconductor is a Gate Turn off Thyristor with Breakover Voltage 4500 V, Breakover Current 3000 A, Gate Trigger Voltage 1 V, Gate Trigger Current 3.5 A, Temperature Operating Range -40 to 125 Degree C. Tags: Disc. More details for DG758BX45 can be seen below.