800 V off-state Triac output with zero-crossing
The MOC3083SR2M is an onsemi optoisolator with a Triac output rated for 800 V off-state voltage — this blocking voltage lets it switch mains directly without a secondary relay, provided the load current stays within the external Triac's rating. The integrated zero-crossing circuit triggers the output only near the AC voltage zero, which cuts the inrush current into resistive loads like heaters and incandescent lamps.
600 V/µs dV/dt immunity for inductive loads
A minimum static dV/dt of 600 V/µs means the output Triac will not falsely trigger from fast voltage transients — the kind you get when switching motors, solenoids, or contactors.
4170 Vrms isolation and industrial temperature range
Rated for 4170 Vrms isolation between input LED and output Triac — this satisfies reinforced insulation requirements for mains-connected equipment per UL.
5 mA LED trigger sensitivity
The maximum LED trigger current is 5 mA — a standard logic output can drive it directly through a current-limiting resistor. The typical forward voltage is 1.3 V, so the resistor calculation is straightforward. The 500 µA typical hold current ensures the Triac stays latched through the zero-crossing until the load current drops below that threshold.