The BT169-400 from KEXIN is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 8 to 9 A, Gate Trigger Voltage 0.2 to 0.8 V, Gate Trigger Current 200 uA, Temperature Operating Range -40 to 125 Degree C. Tags: Surface Mount. More details for BT169-400 can be seen below.