FOD817CW

Overview

The FOD817CW is a single-channel, through-hole phototransistor output optocoupler from onsemi's FOD series. It features a GaAs infrared LED coupled to an NPN phototransistor in a 4-pin MDIP package. Key electrical parameters include a maximum collector-emitter voltage of 70V, a forward current of 50mA, and a typical rise/fall time of 18μs. The device provides 5000Vrms isolation voltage and operates within a temperature range of -55°C to +110°C.

Feature Summary

• Provides galvanic isolation between input and output circuits using an infrared LED and phototransistor pair.

Applications

• Signal isolation in industrial control systems
• Switching power supply feedback loops
• Microcontroller interface circuits

Procurement Notes

Verify the specific C suffix designation against the manufacturer datasheet to confirm the exact Current Transfer Ratio (CTR) binning required for your application. Ensure the 4-pin MDIP package dimensions match your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when standard switching speed and high isolation voltage are required for DC or low-frequency signal transmission. Consider the CTR specifications relative to your load requirements and verify that the 50mA forward current limit aligns with your driving circuit capabilities.

Part Context

This part belongs to the widely used FOD817 family of general-purpose optocouplers. These devices are standard components for basic isolation tasks, offering a balance of performance and cost-effectiveness for non-high-speed applications across various electronic industries.

Replacement Considerations

Compatible substitutes include other FOD817 variants such as FOD817B or FOD817C, provided their specific CTR ranges meet design needs. Cross-brand equivalents like PC817 may be considered if pin compatibility and electrical ratings are verified.