MOC3083M

Triac, SCR Output Optoisolators Overview

The MOC3083M is a zero-crossing triac driver optocoupler manufactured by Lite-On Inc. It features a 6-pin DIP package with an internal LED input and a phototriac output. Key electrical parameters include a minimum repetitive peak off-state voltage (VDRM) of 800V, a minimum static dv/dt of 800V/µs, and an isolation voltage (Viso) of 5000Vrms. The device supports a maximum forward current of 50mA, a typical forward voltage of 1.2V, and an RMS output current of 1A. Operating temperature ranges from -40°C to +100°C.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-crossing detection circuitry for reduced electromagnetic interference during AC switching.
• High insulation capability with 5000Vrms isolation voltage between input and output circuits.
• Robust noise immunity characterized by a high critical rate of rise of off-state voltage (dv/dt).
• Compliant with international safety standards including UL, CSA, FIMKO, and VDE certifications.

Triac, SCR Output Optoisolators Applications

• AC motor drivers
• AC motor starters
• Electromagnetic contactors
• Solid state relays

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific manufacturer origin when sourcing, as this component is also produced by onsemi under identical part numbers. Confirm that the 'M' suffix denotes the wide-lead DIP package variant suitable for through-hole mounting. Ensure compliance with RoHS directives if required for the target assembly. Cross-reference datasheet specifications against the actual supplier's documentation to confirm parameter consistency.

Triac, SCR Output Optoisolators Selection Notes

Select this component for applications requiring precise timing control in AC power systems to minimize inrush currents and electrical noise. The integrated zero-crossing feature makes it suitable for sensitive loads where abrupt voltage transitions must be avoided. Evaluate the 800V blocking voltage against the peak line voltage to ensure adequate safety margins. Consider the thermal dissipation requirements within the 6-DIP package for continuous operation.

Triac, SCR Output Optoisolators Part Context

The MOC3083M belongs to the MOC308x series of zero-crossing triac driver optocouplers. This family includes variants such as the MOC3081M and MOC3082M, which differ primarily in trigger current sensitivity. The MOC3083M is designed for general-purpose AC power switching applications, offering a balance of high voltage handling and reliable isolation in industrial control environments.

Triac, SCR Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers include MOC3081M and MOC3082M. These devices share the same pinout and package but may exhibit differences in trigger current thresholds. Verify that the alternative part meets the specific load requirements before substitution.

Triac, SCR Output Optoisolators FAQ

What is the function of the zero-crossing circuit in the MOC3083M?

The zero-crossing circuit ensures that the internal triac turns on only when the AC line voltage is near zero volts. This reduces electromagnetic interference (EMI) and inrush currents associated with hard switching.

How does the MOC3083M handle high voltage transients?

The device features a high critical rate of rise of off-state voltage (dv/dt) of at least 800V/µs, allowing it to withstand rapid voltage changes without false triggering.