CNY17F4M

Overview

The Fairchild Semiconductor CNY17F4M is a single-channel transistor output optocoupler featuring an NPN phototransistor. It provides a minimum collector-emitter breakdown voltage of 70 V and supports a maximum forward current of 60 mA with a forward voltage of 1.65 V. The device offers a rated current transfer ratio of 40% and operates within a temperature range of -55°C to +100°C. Key electrical specifications include a maximum collector dark current of 50 nA, a maximum power dissipation of 160 mW, and a maximum insulation voltage of 5300 Vrms.

Feature Summary

• Integrates a Gallium Arsenide infrared emitting diode coupled with an NPN phototransistor for signal isolation.
• Provides high collector-emitter breakdown voltage capability suitable for robust switching applications.
• Offers defined current transfer ratio groups to ensure consistent performance across operating conditions.

Applications

• Power supply regulators
• Digital logic inputs
• Microprocessor inputs
• Appliance sensor systems

Procurement Notes

Verify the specific suffix designation when sourcing, as variations such as .300 or -M indicate different package colors or recognition certifications. Confirm that the required isolation voltage meets the application safety standards, noting that some variants may have reduced ratings compared to standard models. Ensure the component matches the required DIP-6 through-hole or surface-mount footprint depending on the specific part number variant selected.

Selection Notes

Select this component for circuits requiring galvanic isolation between low-voltage control logic and higher-voltage loads. The 70 V collector-emitter rating allows direct interfacing with various transistor loads without additional protection. Consider the thermal management requirements given the 160 mW power dissipation limit in enclosed environments. Verify compatibility with the target PCB layout regarding pin spacing and mounting style constraints.

Part Context

This device belongs to the CNY17 series of phototransistor optocouplers manufactured by Fairchild Semiconductor. The series typically includes variants like CNY17F-1, CNY17F-2, and CNY17F-3, distinguished primarily by their current transfer ratio ranges. The CNY17F4M specifically denotes a unit with a rated CTR of 40%, providing a standardized gain characteristic for general-purpose isolation tasks.

Replacement Considerations

The MOC8104 is identified as an equivalent or substitute part. Note that some sources indicate the MOC8104 may have a reduced isolation voltage rating compared to the CNY17F4M. Verify that the alternative component meets the specific insulation voltage requirements of the design before substitution.