The BTA20 is an electronic part manufactured by YFW Electronics and is a 10mA, 1W, 20A, 210A@20ms TRIAC in a TO-220 package and is RoHS Compliant. It is a TRIAC, or Triode for Alternating Current, which is a type of semiconductor device used to switch alternating current in devices such as microwaves, dimmers, and other appliances. The part features low on-state impedance, small electrical noise, fast turn-on and turn-off times, and temperature stability, making it suitable for AC power control.