MOC3021SR2M

Triac, SCR Output Optoisolators Overview

The MOC3021SR2M is a single-channel triac output optocoupler from onsemi, designed for AC power control applications. It features a gallium arsenide infrared LED coupled to a photosensitive triac. The device provides electrical isolation with an insulation voltage of 5300 Vrms and supports a maximum repetitive peak off-state voltage of 400 V. Key electrical parameters include a forward current of 60 mA, a forward voltage of 1.15 V, and a maximum power dissipation of 330 mW. It operates without a zero-crossing circuit, allowing for phase-angle firing control. The component functions within a temperature range of -40°C to +85°C and is housed in a 6-SMD surface-mount package.

Triac, SCR Output Optoisolators Feature Summary

• Integrates an infrared LED emitter with a photosensitive triac for robust signal transmission across isolation barriers.
• Provides high-voltage isolation capability suitable for interfacing low-voltage control circuits with high-voltage AC loads.
• Supports non-zero-crossing operation, enabling precise phase-angle control for variable power delivery in AC systems.

Triac, SCR Output Optoisolators Applications

• Solid-state relays for AC load switching
• Motor speed control circuits
• Lighting dimmer applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix (SR2M) corresponds to the required tape-and-reel packaging configuration, as standard variants may differ in shipping format. Confirm that the 6-SMD鸥翼 (gull-wing) footprint matches the target PCB design. Ensure compliance with RoHS directives if restricted substances are a constraint for the final assembly. Cross-reference the manufacturer part number against official distributor catalogs to confirm current production status and availability channels.

Triac, SCR Output Optoisolators Selection Notes

Select this component when phase-angle control is required rather than zero-crossing switching, as it lacks internal zero-crossing detection. Consider the 400 V blocking voltage limit for the intended AC line voltage. Evaluate the thermal management requirements given the 330 mW power dissipation rating. Ensure the driving circuit can supply sufficient gate trigger current, noting the maximum trigger current specification, to reliably activate the triac under varying load conditions.

Triac, SCR Output Optoisolators Part Context

This device belongs to the MOC302x series of OptoTriac products from onsemi. It is functionally similar to through-hole equivalents like the MOC3021 but utilizes a surface-mount package for automated assembly. The series is commonly used in industrial and consumer electronics for isolating microcontroller outputs from mains-powered devices. It serves as a direct replacement for legacy DIP-packaged triac drivers where board space optimization is necessary.

Triac, SCR Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers include MOC3021M and MOC3021S. Verify pinout compatibility and package dimensions before substitution. Check if the alternative variant includes or excludes zero-crossing functionality, as this significantly alters control behavior. Ensure the replacement meets the same insulation voltage and current ratings for the specific application.