St general purpose triacs st z0405mf standard general purpose triac 4a rms on state current 21a peak non repetitive surge current 600v peak repetitive off state voltage 13v gate trigger voltage 5ma gate trigger current 5ma holding current 180mr dynamic resistance 02w power dissipation to 202 3 package suitable for general purpose ac switching applications they can be found in applications such as home appliances electronic valve pump door lock small lamp control fan speed c