Isolated tab triacs st bta12 600bw snubberless insulated tab triac 12a rms on state current 126a peak non repetitive surge current 600v peak repetitive off state voltage 13v gate trigger voltage 50ma gate trigger current 50ma holding current 35mr dynamic resistance 1w power dissipation to 220ab package 23g weight medium current triac low thermal resistance with clip bonding high commutation 4 quadrant or very high commutation 3 quadrant capability they can be used as an on