The BT169D is a through-hole, dual-in-line, thyristor power switch manufactured by NXP Semiconductors. It features a 2.5A current rating, and a breakdown voltage of 45V. The BT169D is designed for use in automotive applications such as lights, horns, wipers, and power transistor ignition systems. It can also be used in mains-operated or AC/DC general-purpose converters. It has a low on-resistance and is RoHS compliant.