FODM3021R2

Triac, SCR Output Optoisolators Overview

The FODM3021R2 is a single-channel phototriac output optocoupler manufactured by Fairchild Semiconductor. It features a gallium arsenide infrared LED coupled to a triac detector, providing electrical isolation without zero-crossing circuitry. Key parameters include an insulation voltage of 3750 Vrms, a maximum continuous output current of 70 mA, and a peak off-state voltage (VDRM) of 400 V. The device operates with a forward current up to 60 mA and a forward voltage of 1.2 V, dissipating up to 300 mW. It is housed in a MiniFlat 4-SMD package.

Triac, SCR Output Optoisolators Feature Summary

• Provides high-voltage electrical isolation between control circuits and power loads via optical coupling.
• Designed for direct driving of triacs and SCRs in AC power switching applications.
• Operates without zero-crossing detection, allowing firing angle control at any point in the AC cycle.

Triac, SCR Output Optoisolators Applications

• Solid-state relay (SSR) driver circuits
• AC motor speed control systems
• Lighting dimmer controls

Triac, SCR Output Optoisolators Procurement Notes

Verify manufacturer source carefully as this component has been associated with both Fairchild Semiconductor and onsemi due to corporate acquisition history. Confirm RoHS compliance status and specific packaging variants directly with authorized distributors. Check lifecycle status as some sources indicate obsolescence while others list it as new. Ensure the supplier provides valid traceability documentation for quality assurance.

Triac, SCR Output Optoisolators Selection Notes

Select this component when zero-crossing functionality is not required for phase-angle control applications. The 400 V blocking voltage suits low-to-medium voltage AC loads. Consider the MiniFlat SMD package for surface-mount assembly constraints. Verify that the 70 mA output current rating meets the gate drive requirements of the target triac or SCR. Compare against alternatives if zero-crossing behavior is needed to reduce EMI.

Triac, SCR Output Optoisolators Part Context

This part belongs to the FODM series of triac output optocouplers designed for industrial and consumer AC power control. It serves as an interface between low-voltage logic circuits and high-voltage AC power stages. The R2 suffix typically denotes a specific tape-and-reel packaging variant for automated assembly. The device replaces older through-hole equivalents in modern compact PCB designs.

Triac, SCR Output Optoisolators Replacement Considerations

Direct substitutes may include other non-zero-crossing triac output optocouplers from Fairchild or onsemi with similar pinouts and electrical ratings. Verify compatibility regarding insulation voltage, output current capacity, and package dimensions before substitution. Cross-reference with MOC3021 family devices if leaded packages are acceptable.