The MCMA200P1800YA-MI from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 1800 V, Breakover Current 200 A, Gate Trigger Voltage 0.83 V, Gate Trigger Current 385 A, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for MCMA200P1800YA-MI can be seen below.