FODM3021R4

Triac, SCR Output Optoisolators Overview

The FODM3021R4 is a Triac and SCR output optocoupler manufactured by Fairchild Semiconductor. It features a PhotoTriac output with an isolation voltage of 3750 Vrms. The device supports a maximum forward current of 60 mA and a peak forward voltage of 1.2 V. It operates within a temperature range of -40°C to +100°C. The package type is Miniflat (SMD-4). Key electrical parameters include a maximum continuous output current of 70 mA, a holding current of 300 uA, and a maximum trigger current of 15 mA.

Triac, SCR Output Optoisolators Feature Summary

• Provides high-voltage isolation between control circuits and triac loads
• Designed specifically as a trigger device for AC power control applications
• Utilizes a compact surface-mount Miniflat package for space-constrained designs

Triac, SCR Output Optoisolators Applications

• AC motor speed control systems
• Solid-state relay drivers
• Lighting dimmer circuits

Triac, SCR Output Optoisolators Procurement Notes

Verify the manufacturer source carefully, as this component has been associated with multiple entities including onsemi and Rochester Electronics due to corporate acquisitions. Confirm RoHS compliance status and specific lot traceability requirements before procurement. Ensure the supplier provides valid datasheets matching the Fairchild or onsemi specifications to avoid counterfeit components.

Triac, SCR Output Optoisolators Selection Notes

Select this component when a non-zero-crossing triac driver is required for phase-angle control applications. It is suitable for driving small to medium power triacs directly. Consider the 3750 Vrms isolation rating for safety-critical interfaces. Evaluate the Miniflat package constraints against PCB layout requirements compared to standard DIP packages.

Triac, SCR Output Optoisolators Part Context

This part belongs to the FODM30 series of optoisolators. It serves as a bridge between low-voltage logic circuits and high-voltage AC loads. The series is widely used in industrial automation and consumer electronics for reliable switching of AC power devices while maintaining electrical safety standards through optical isolation.

Triac, SCR Output Optoisolators Replacement Considerations

The FODM3021R2 is a direct pin-compatible replacement within the same family. Other equivalents may include MOC3021 variants, though package differences must be addressed. Verify that substitute parts maintain the same non-zero-crossing characteristic and isolation voltage ratings.