4N32SM

Overview

The onsemi 4N32SM is a single-channel transistor output optocoupler featuring a photodarlington configuration with an accessible base terminal. It provides high isolation voltage of 4170 Vrms and supports surface mount installation in a 6-pin PDIP Gull Wing package. The device operates within a temperature range of -40°C to +100°C, with a maximum collector-emitter voltage of 30V and forward current of 80mA. It offers a minimum current transfer ratio of 50% and handles up to 150mA collector current.

Feature Summary

• Photodarlington output structure with dedicated base pin for enhanced control and speed
• High insulation voltage rating ensuring robust signal isolation between input and output circuits
• Surface-mount compatible packaging designed for automated assembly processes

Applications

• Industrial automation control systems
• Power supply feedback loops
• Solid-state relay driver circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer datasheet to confirm package type and tape/reel specifications. Ensure compliance with RoHS directives and check for SVHC status prior to integration. Confirm that the supplier provides valid traceability documentation and original manufacturer certification to guarantee component authenticity and quality standards.

Selection Notes

Select this component when high gain and fast response are required from a photodarlington interface. The accessible base allows for external biasing to optimize switching speed. Consider the 4170 Vrms isolation barrier for safety-critical applications. Evaluate thermal dissipation requirements given the 270 mW power dissipation limit in the specified SMD package.

Part Context

This part belongs to the 4N32M series of transistor output optocouplers manufactured by onsemi. It is designed for general-purpose isolation tasks where higher current transfer ratios and faster switching than standard phototransistors are needed. The series is widely used in industrial and consumer electronics for signal transmission across isolated boundaries.

Replacement Considerations

Direct substitutes include other 6-pin SMD photodarlington optocouplers with comparable isolation ratings and pinouts. Verify electrical parameters such as CTR and Vceo match before substitution. Cross-reference with equivalent parts from other manufacturers offering similar surface-mount darlington configurations.