The MDC580-28io7 from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 2800 V, Breakover Current 581 A, Gate Trigger Voltage 0.926 V, Gate Trigger Current 1372 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MDC580-28io7 can be seen below.