The BT149G,412 is an one-way thyristor, also known as a TRIAC, manufactured by Infineon. It is a three-terminal solid-state semiconductor device with an thyristor structure which can be triggered by a single gate pulse to provide low impedance in both directions. It is rated at 600 volts and is designed in a TO-92-3 form factor. The BT149G,412 is RoHS compliant and can be used in a variety of applications including AC switching, phase control, motor control and rectifiers.