The S8X5ECS from Littelfuse is a Silicon Controlled Rectifier with Breakover Voltage 800 V, Breakover Current 0.5 A, Gate Trigger Voltage 1.8 V, Gate Trigger Current 0.0001 A, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for S8X5ECS can be seen below.