The BT169D from WeEN Semiconductors is a Silicon Controlled Rectifier with Breakover Voltage 400 V, Breakover Current 8 A, Gate Trigger Voltage 0.2 to 0.8 V, Gate Trigger Current 0.0002 A, Temperature Operating Range -40 to 150 Degree C. Tags: Through Hole. More details for BT169D can be seen below.