FOD817W

Overview

The FOD817W is a single-channel phototransistor output optocoupler from onsemi's FOD series. It features a GaAs infrared LED coupled to an NPN phototransistor within a 4-pin DIP package. Key electrical parameters include a maximum collector-emitter voltage of 70V, a maximum forward current of 50mA, and an isolation voltage of 5000Vrms. The device typically exhibits a current transfer ratio ranging from 50% to 600%, with rise and fall times of approximately 18µs. Operating temperatures span from -55°C to +110°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits via optical coupling.
• Utilizes a standard 4-pin DIP package for through-hole mounting compatibility.
• Features an NPN phototransistor output suitable for digital signal transmission.

Applications

• General-purpose digital signal isolation in industrial control systems
• Power supply feedback loops for circuit protection
• Microcontroller interface isolation

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and certification status. Ensure the ordered variant matches the required isolation voltage and CTR specifications for the target application. Cross-reference manufacturer part numbers with distributor listings to confirm authenticity and RoHS compliance before procurement.

Selection Notes

Select this component when a standard-speed, single-channel transistor output isolator is required. Consider the 5000Vrms isolation rating for safety-critical applications. Evaluate the CTR range to ensure adequate signal margin for the load requirements. Verify thermal limits if operating near the upper temperature boundary.

Part Context

The FOD817W belongs to the FOD817 family of general-purpose optocouplers. This series is widely used for basic isolation tasks where moderate speed and high reliability are needed. The 'W' suffix typically denotes a specific package configuration or certification level within the broader FOD817 product line.

Replacement Considerations

Compatible substitutes include the PC817, IL300 (with circuit adjustments), and HCPL-2630 (for higher speed). Verify pinout compatibility and electrical parameter equivalence before substitution.

FAQ

What is the typical rise and fall time for the FOD817W?

The typical rise and fall times are approximately 18 microseconds each.

Does the FOD817W support AC input signals?

No, the FOD817W is designed for DC input signals as it contains a single infrared LED.