The MCR100-8-89 from FuxinSemi Semiconductor is a Silicon Controlled Rectifier with Breakover Voltage 600 V, Breakover Current 8 A, Gate Trigger Voltage 0.8 V, Gate Trigger Current 10 to 200 uA, Temperature Operating Range -40 to 110 Degree C. Tags: Surface Mount. More details for MCR100-8-89 can be seen below.