The BT137-800D TRIAC manufactured by Weida Semiconductor is a four-terminal, read-only memory-mapped device with an insulated tab. It is a Gates-controlled bidirectional silicon Thyristor capable of blocking voltages up to 800 Volts at operating temperatures ranging from -40°C to +125°C. Its encapsulation is the TO-252-4R package that complies with the ROHS (Restriction of Hazardous Substances) standards. This part is specifically designed to be used as a solid state switch for controlling AC electronic circuits in applications such as motors, light dimmers, switching power supplies and other AC control applications.