CNY17F3W

Overview

The CNY17F3W is a single-channel transistor output optoisolator manufactured by onsemi, formerly Fairchild Semiconductor. It provides electrical isolation with a maximum isolation voltage of 5300Vrms. The device features an NPN phototransistor output capable of handling a collector-emitter voltage of 70V and a continuous collector current of 50mA. Key electrical parameters include a typical forward voltage of 1.35V at a maximum DC forward current of 100mA. The current transfer ratio ranges from 100% to 200% at 10mA input. Switching characteristics include typical rise and fall times of 1µs and 2µs, respectively, with turn-on and turn-off times of 2µs and 3µs. It operates within a temperature range of -55°C to 100°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes an NPN phototransistor for reliable signal transmission
• Designed for through-hole mounting in standard DIP packages

Applications

• General-purpose digital signal isolation
• Microcontroller interface circuits
• Power supply feedback loops

Procurement Notes

Verify component authenticity carefully as the CNY17F3W is officially listed as obsolete and no longer manufactured by onsemi. Sourcing should focus on authorized distributors or certified surplus suppliers like Rochester Electronics to ensure part integrity. Confirm that received units match the original Fairchild/Onsemi specifications and packaging standards before integration into designs.

Selection Notes

Select this component only if legacy compatibility with existing Fairchild designs is required. For new designs, consider modern equivalents with updated availability and potentially improved performance metrics. Ensure the 5300Vrms isolation rating meets specific safety standards for the target application environment.

Part Context

The CNY17F3W belongs to the widely used CNY17 series of optocouplers, originally developed by Fairchild Semiconductor. This series has been a standard for general-purpose isolation in industrial and consumer electronics. Onsemi acquired Fairchild's semiconductor business, inheriting this product line. The W suffix typically denotes a specific tape-and-reel or bulk packaging variant within the family.

Replacement Considerations

Public confirmed substitute part numbers include CNY17F-1G from Isocom Components.