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MOC3083 Zero Cross Triac Driver Optoisolator IC
The MOC3083 is a zero-cross optoisolator triac driver IC used to safely interface low-voltage control circuits (Arduino, microcontrollers, PLCs) with high-voltage AC loads.
It contains an infrared LED input and a photosensitive triac output, providing strong galvanic isolation between the control side and AC mains.
The key feature of the MOC3083 is its zero-cross detection capability. This ensures that the triac is triggered only when the AC waveform crosses zero volts, minimizing:
- Electrical noise (EMI/RFI)
- Inrush current
- Stress on the external triac and load
- Electromagnetic interference
Compared to other models in the MOC308x family, the MOC3083 requires the lowest LED trigger current, making it easy to drive directly from microcontroller GPIO pins.
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Features
- Zero-cross circuitry for low-noise AC switching
- Low input LED trigger current (typically 5mA)
- High isolation voltage (7500V peak)
- Internal phototriac pre-driver
- Compatible with 50/60 Hz AC mains
- Ideal for clean ON/OFF switching (not dimming)
- Low input-output capacitance
- Works with logic-level signals and MCUs
- Standard 6-pin DIP package
Applications
- Solid-state relays (SSR)
- Low-noise AC load switching
- Home appliances (heaters, pumps, motors ON/OFF)
- AC lamp and LED bulb control (no dimming)
- Thermostats, timers, automation relays
- PLC-controlled AC interfaces
- Industrial machine control
- Solenoid and valve control
- Resistive and inductive AC load switching
Specification:-
| Symbol | Parameter | Value | Unit |
| IF | Forward current | 60 | mA |
| PD | Power dissipation | 120 | mW |
| VR | Reverse Voltage | 6 | V |
| Tstg | Storage temperature range | -40 to +150 | °C |
| TOPR | Operating Temperature | -40 to +85 | °C |
| TSOL | Lead Solder Temperature | 260 for 10 sec | °C |
| ITSM | Peak Repetitive Surge Current (PW = 1 ms, 120 pps) | 1 | A |
| VDRM | Off-State Output Terminal Voltage | 800 | V |
*Product image for illustration purposes only, actual product may vary.
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