CNY171FVM

Transistor, Photovoltaic Output Optoisolators Overview

The CNY171FVM is a single-channel transistor output optocoupler from onsemi, designed for high-voltage isolation applications. It features an NPN phototransistor with a base terminal for enhanced switching control and stability. The device provides a minimum isolation voltage of 4170 Vrms between the input LED and output collector-emitter terminals. Key electrical parameters include a maximum forward voltage of 1.65V at 60mA input current, and a collector-emitter saturation voltage of up to 400mV. The unit supports a maximum collector current of 50mA and a collector-emitter voltage of 70V. Current transfer ratios range from 40% to 80%, with typical rise and fall times of 4μs and 20μs respectively.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides robust galvanic isolation via an infrared LED coupled to an NPN phototransistor with a dedicated base pin for improved noise immunity and switching speed.

Transistor, Photovoltaic Output Optoisolators Applications

• High-voltage signal isolation in industrial control systems
• Isolation interfaces for microcontroller-based digital communication lines
• Power supply feedback loops requiring reliable voltage separation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix FVM confirms the surface-mount package variant and internal die specifications against the official datasheet. Ensure compatibility with peak reflow temperature profiles defined by the manufacturer. Confirm that the 4170 Vrms isolation rating meets the safety requirements of the target application environment.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a base-driven phototransistor is required for faster response or better linearity compared to standard emitter-only outputs. Consider the 4170 Vrms isolation barrier for applications demanding higher creepage and clearance distances than standard 3750 Vrms devices. Evaluate the 40-80% current transfer ratio to ensure adequate drive capability for downstream logic circuits without excessive input current.

Transistor, Photovoltaic Output Optoisolators Part Context

This part belongs to the CNY17 series of optocouplers, which are widely used for general-purpose isolation. The CNY171FVM specifically denotes the version with an NPN phototransistor featuring a base connection, housed in a surface-mount package. It serves as a critical interface component for separating low-voltage control circuits from high-voltage power stages.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct substitutes include other CNY171 variants with compatible pinouts and electrical characteristics, such as through-hole versions if mechanical constraints allow. Verify that any replacement maintains the 4170 Vrms isolation rating and similar current transfer ratio ranges to ensure circuit performance parity.

Transistor, Photovoltaic Output Optoisolators FAQ

What is the purpose of the base terminal on the phototransistor?

The base terminal allows for external biasing or pull-down connections, which can improve switching speed, reduce storage time, and enhance noise immunity compared to floating-base configurations.

What is the maximum isolation voltage supported by this device?

The CNY171FVM supports a maximum RMS isolation voltage of 4170 V between the input and output sections.