4N32

Overview

The Vishay 4N32 is a single-channel optocoupler featuring a photodarlington output with an accessible base connection. It provides high current transfer ratio performance, specified at a minimum of 500% at 10mA forward current. The device offers robust electrical isolation with a voltage rating of 5300Vrms. Packaged in a standard 6-pin DIP configuration for through-hole mounting, it supports DC input signals. The component is designed for reliable signal transmission across isolated circuits while maintaining high gain characteristics suitable for various industrial applications.

Feature Summary

• Photodarlington output structure delivers high current gain for sensitive detection applications
• Accessible base pin allows for external control of response time and sensitivity
• High isolation voltage rating ensures safety in high-voltage circuit separation
• Single-channel configuration simplifies integration into compact designs

Applications

• Industrial control systems requiring galvanic isolation
• Solid-state relay driver circuits
• Microcontroller interface isolation
• Power supply feedback loops

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel versus tube packaging options available from authorized distributors. Confirm RoHS compliance status and lead times directly with suppliers as this component may be classified as obsolete or end-of-life by the manufacturer. Ensure that the supplier provides valid traceability documentation and original manufacturer certification to guarantee authenticity and prevent counterfeit components in critical production lines.

Selection Notes

Select this component when high current transfer ratio is required without additional amplification stages. The accessible base terminal enables customization of switching speed, which is typically slower than standard phototransistor variants. Consider thermal management requirements within the DIP-6 package limits. Evaluate if the Darlington configuration's higher saturation voltage meets the load requirements compared to standard transistor outputs.

Part Context

The 4N32 belongs to the widely recognized 4Nxx series of optocouplers produced by Vishay Semiconductor Opto Division. This family is established for general-purpose isolation tasks. The 4N32 specifically distinguishes itself from the 4N35 by utilizing a Darlington pair output instead of a single phototransistor, resulting in significantly higher gain but potentially slower response times. It shares similar pinout compatibility with other devices in the series for design flexibility.

Replacement Considerations

• 4N33

FAQ

What is the function of the base connection on the photodarlington output?

The base connection allows users to connect an external resistor or capacitor to adjust the turn-off time and improve the switching speed of the device.

How does the current transfer ratio of the 4N32 compare to standard phototransistor optocouplers?

The 4N32 features a high current transfer ratio of at least 500%, which is significantly higher than typical single phototransistor optocouplers that often range between 100% and 300%.