FOD817A300

Overview

The FOD817A300 is a quad optocoupler from onsemi, featuring four independent channels within a single package. It utilizes an AlGaAs LED coupled to a phototransistor for signal isolation. The device offers high common-mode rejection and fast switching speeds suitable for digital communication applications. Key electrical characteristics include a forward voltage of approximately 1.5V at 10mA and a collector-emitter saturation voltage of 0.4V. The isolation voltage rating is typically 5000 VRMS, ensuring robust safety compliance in industrial environments.

Feature Summary

• Quad configuration provides four isolated channels in a compact footprint
• High common-mode transient immunity ensures reliable signal integrity
• AlGaAs LED technology enables efficient light emission and response

Applications

• Digital signal isolation in industrial control systems
• Interface circuits for microprocessors and logic devices
• Power supply feedback loops requiring galvanic isolation

Procurement Notes

Verify the specific suffix code matches the required tape and reel quantity or tube packaging option. Confirm that the lead finish and RoHS compliance status align with your assembly requirements. Cross-reference the datasheet revision date to ensure compatibility with current design standards. Check for any regional regulatory restrictions applicable to your deployment location before finalizing orders.

Selection Notes

Choose this component when multiple isolated channels are needed within a single footprint constraint. Evaluate the required isolation voltage against system safety standards. Consider the propagation delay specifications if high-speed data transmission is critical. Ensure the input current limits accommodate your driving circuit capabilities without exceeding absolute maximum ratings.

Part Context

This part belongs to the FOD817 family of quad optocouplers designed for general-purpose isolation tasks. It complements single-channel variants by offering space savings in dense PCB layouts. The series is widely used in consumer electronics and industrial automation where cost-effective isolation solutions are prioritized over ultra-high speed performance.

Replacement Considerations

Direct pin-compatible substitutes may include other quad optocouplers from different manufacturers such as Vishay or Everlight. Verify that the replacement maintains identical pinout configuration and isolation voltage ratings. Check for equivalent CTR (Current Transfer Ratio) ranges to ensure proper signal coupling. Always validate thermal performance and package dimensions before implementing a cross-brand substitution.