FOD817CW

Overview

The FOD817CW is a single-channel, 4-pin phototransistor optocoupler manufactured by Fairchild Semiconductor. It integrates a gallium arsenide infrared emitting diode with a silicon phototransistor in a DIP-4 package. The device provides an isolation voltage of 5000 Vrms and a minimum collector-emitter breakdown voltage (BVCEO) of 70 V. The current transfer ratio for the C suffix ranges from 200% to 400%. It supports a maximum forward current of 50 mA and typical rise/fall times of 18 µs.

Feature Summary

• High input-output isolation voltage capability
• Compatible with Pb-free IR reflow soldering processes
• Compact 4-pin dual in-line physical configuration
• Certified by UL, C-UL, and VDE safety standards

Applications

• Power supply regulators
• Digital logic inputs
• Microprocessor inputs

Procurement Notes

Verify the specific Current Transfer Ratio group required for the application, as the 'C' designation indicates a 200–400% range. Confirm that the DIP-4 through-hole package aligns with the target PCB layout. Note that Fairchild Semiconductor has been integrated into ON Semiconductor; ensure the ordering nomenclature matches current system requirements, particularly regarding suffix conventions.

Selection Notes

Select this component when high isolation voltage and standard digital logic interfacing are required. The C-group binning ensures a higher current transfer ratio compared to lower bins, suitable for driving sensitive logic inputs. Ensure the design accounts for the 50 mA maximum forward current limit and the 70 V collector-emitter voltage rating to maintain safe operating conditions within the specified temperature range.

Part Context

The FOD817 series belongs to a family of 4-pin phototransistor optocouplers designed for general-purpose isolation. The CW suffix typically denotes the specific tape-and-reel or box packaging variant of the standard FOD817C device. This series is engineered for applications requiring reliable signal transmission across isolated boundaries with minimal propagation delay.

Replacement Considerations

Direct substitutes include other FOD817 variants with matching C-bin specifications, such as FOD817C. Generic equivalents may be considered if they meet the 5000 Vrms isolation and 200–400% CTR requirements.