FOD814A3SD

Overview

The FOD814A3SD is a single-channel transistor output optocoupler from onsemi, featuring a unique dual infrared LED input configuration. It provides 5000Vrms isolation and supports AC or DC input signals. Key electrical parameters include a maximum collector-emitter voltage of 70V, a continuous collector current of 50mA, and a typical forward voltage of 1.2V to 1.4V. The device offers a current transfer ratio ranging from 50% to 150% at 1mA input. Operating temperatures span from -55°C to 105°C, with rise and fall times typically at 4µs and 3µs respectively.

Feature Summary

• Dual inverse-parallel gallium arsenide infrared LEDs enable polarity-insensitive operation for both AC and DC signal transmission.
• High isolation capability of 5000Vrms ensures robust safety in high-voltage environments.
• Fast switching performance with typical rise and fall times suitable for general-purpose digital isolation applications.

Applications

• AC line monitoring circuits
• Polarity-insensitive DC sensing interfaces
• General-purpose digital isolation

Procurement Notes

Verify the specific suffix 'A3' against official onsemi documentation to confirm the dual-LED variant specifications. Ensure the ordering code matches the required tape-and-reel packaging format. Cross-reference the datasheet version to validate current CTR and isolation ratings prior to procurement.

Selection Notes

Select this component when AC input compatibility or bidirectional DC sensing is required within a single channel. The dual-LED architecture distinguishes it from standard single-LED optocouplers. Verify that the 70V collector voltage and 50mA current limits meet the load requirements of the target application circuit.

Part Context

This part belongs to the FOD814 series, which includes variants like FOD814SD. The FOD814A3SD specifically denotes the version with dual inverse-parallel LEDs, differing from the standard FOD814SD which typically contains a single LED. This structural difference dictates its unique ability to handle AC inputs without external rectification.

Replacement Considerations

• FOD814SD

FAQ

What distinguishes the FOD814A3SD from the standard FOD814SD?

The FOD814A3SD contains two gallium arsenide infrared emitting diodes connected in inverse parallel, allowing it to accept AC inputs. The standard FOD814SD typically features a single LED.

Is the FOD814A3SD suitable for AC line monitoring?

Yes, the dual-LED input design makes it ideal for AC line monitoring and polarity-insensitive DC sensing applications.