MOC3021S

Triac, SCR Output Optoisolators Overview

The MOC3021S is a Triac and SCR output optocoupler manufactured by Lite-On Inc. It features a single channel with a phototriac output and lacks a zero-crossing circuit. The device operates within an insulation voltage of 5000 Vrms, supporting a maximum forward current of 50 mA and a forward voltage of 1.15 V. It dissipates up to 330 mW and withstands a blocking voltage of 400 V. Operating temperatures range from -40°C to +100°C, housed in a 6-SMD Gull Wing package.

Triac, SCR Output Optoisolators Feature Summary

• Provides electrical isolation between control circuits and high-voltage AC loads using a phototriac output structure.
• Designed for non-zero-crossing applications requiring immediate triac triggering upon input signal activation.
• Offers robust insulation capabilities suitable for interfacing low-voltage logic with mains-powered devices.

Triac, SCR Output Optoisolators Applications

• Solid-state relays for switching AC loads
• Motor speed control circuits
• Lighting dimmer modules

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix against official Lite-On documentation to confirm pinout compatibility and packaging type. Ensure the selected variant matches the required thermal dissipation limits and isolation voltage ratings for the target application environment. Cross-reference datasheet parameters with system requirements before finalizing component selection.

Triac, SCR Output Optoisolators Selection Notes

Select this component when immediate phase-angle control is required without the delay associated with zero-crossing detection. Confirm that the load current remains within the phototriac's safe operating area. Evaluate thermal management needs given the 330 mW power dissipation rating in the SMD package configuration.

Triac, SCR Output Optoisolators Part Context

This part belongs to the MOC302x series of Triac output optoisolators. It serves as a surface-mount alternative to through-hole variants like the MOC3021, providing equivalent electrical performance in a compact form factor suitable for automated assembly processes.

Triac, SCR Output Optoisolators Replacement Considerations

MOC3021S-TA1 is a verified tape-and-reel variant of the same functional device. Direct replacements must maintain the non-zero-crossing characteristic and compatible 6-SMD footprint.