Triac output optoisolator with 800 V off-state blocking
The MOC3082M is an onsemi 1-channel Triac output optoisolator rated for 800 V off-state voltage and 4170 Vrms isolation. The 800 V off-state rating means it can directly block the peak of a 240 VAC line with substantial margin, making it suitable for residential and light industrial AC load switching without an external snubber in many designs. A built-in zero-crossing circuit triggers the Triac only near the AC voltage zero, which minimizes inrush current and conducted EMI when switching resistive or lightly inductive loads such as heaters, solenoids, or incandescent lamps.
600 V/µs dV/dt immunity and drive current
Minimum static dV/dt is 600 V/µs, which prevents false turn-on from fast voltage transients on the AC line — a common failure mode in motor-drive or relay-coil environments where back-EMF spikes appear across the Triac. Maximum LED trigger current (Ift) is 10 mA, with a typical forward voltage of 1.3 V. A standard 5 V or 3.3 V logic output can drive the LED through a current-limiting resistor; the 60 mA absolute maximum DC forward current leaves headroom for derating at elevated temperatures. Typical holding current (Ih) is 500 µA, which means the Triac will stay latched once triggered as long as the load current exceeds this threshold — important for low-power loads that might drop below holding current near the zero crossing.
Active production, through-hole 6-DIP package
The through-hole format simplifies manual prototyping and rework compared to surface-mount alternatives. Operating temperature range is -40°C to 85°C, covering most indoor and outdoor commercial/industrial environments. UL approved for safety-recognised designs.