FOD8173SD

Overview

The FOD8173SD is a single-channel phototransistor optocoupler manufactured by Fairchild Semiconductor, now part of ON Semiconductor. It features a gallium arsenide infrared LED coupled to a silicon phototransistor in a surface-mount DIP-4 package. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V and a maximum forward current of 50 mA. The device offers a high insulation voltage of 5000 Vrms and a typical current transfer ratio of 80% at 5 mA input. It is lead-free and RoHS compliant.

Feature Summary

• Provides galvanic isolation between input and output circuits via an infrared LED and phototransistor pair.
• Designed for surface-mount assembly using a compact four-pin DIP form factor.
• Ensures safety compliance with UL approval and high dielectric strength insulation.

Applications

• Motor control systems requiring signal isolation
• Switching power supply feedback loops
• Industrial control system interfaces

Procurement Notes

Verify the specific suffix designation against the manufacturer's updated nomenclature, as Fairchild part numbers may have transitioned to ON Semiconductor formats. Confirm that the requested component matches the exact pinout and packaging specifications required for your PCB layout. Ensure compliance with current environmental regulations regarding lead-free materials.

Selection Notes

Select this component when a surface-mount solution is required for general-purpose isolation applications. Consider the 70 V collector-emitter voltage rating for low-voltage switching tasks. Evaluate the current transfer ratio requirements against the driving circuit capabilities to ensure adequate signal transmission across the isolation barrier.

Part Context

This device belongs to the FOD817 family of high-temperature phototransistor optocouplers. The series is widely used in industrial and commercial equipment where reliable signal transmission across isolated domains is necessary. The SD suffix typically denotes a specific surface-mount tape-and-reel packaging configuration distinct from through-hole variants.

Replacement Considerations

Check for direct equivalents within the ON Semiconductor portfolio following the Fairchild integration. Verify pin compatibility and electrical ratings before substituting with other 4-pin transistor-output optocouplers.

FAQ

What is the maximum insulation voltage of the FOD8173SD?

The device supports an insulation voltage of 5000 Vrms.

Is the FOD8173SD available in a lead-free package?

Yes, the component is certified as lead-free and RoHS compliant.