The MCR12LDHR from Digitron Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 100 A, Gate Trigger Voltage 0.5 to 0.8 V, Gate Trigger Current 2.0 to 8.0 mA, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for MCR12LDHR can be seen below.