4N33SD

Overview

The onsemi 4N33SD is a single-channel transistor output optocoupler featuring a Photodarlington configuration with an accessible base terminal. It utilizes a surface-mount SMD-DIP-6 package for through-hole compatibility. Key electrical parameters include a maximum collector-emitter voltage of 30 V, a peak forward current of 80 mA, and a power dissipation rating of 250 mW. The device offers high isolation capability with an insulation voltage of 5300 Vrms. Operating temperatures range from -55°C to +125°C, ensuring reliability in demanding environments.

Feature Summary

• Integrates a photodarlington output structure with a dedicated base pin for enhanced control flexibility.

Applications

• Industrial automation signal isolation
• Microcontroller interface circuits
• Power supply feedback loops

Procurement Notes

Verify the specific suffix designation against the manufacturer's latest documentation to confirm package type and compliance status. Ensure that the procurement channel provides valid traceability records. Confirm that the delivered components match the specified SMD-DIP-6 form factor and electrical ratings prior to integration into the design.

Selection Notes

Select this component when high isolation voltage and Darlington gain are required in a surface-mount compatible footprint. The accessible base allows for speed optimization or sensitivity adjustment. Verify thermal management requirements given the 250 mW dissipation limit and ensure the operating temperature range aligns with the application environment.

Part Context

This part belongs to the 4N33 series of optocouplers, which are widely used for general-purpose isolation. The SD suffix indicates a surface-mount variant designed for automated assembly while maintaining the electrical characteristics of the traditional DIP versions. It serves as a bridge between low-voltage logic circuits and higher voltage loads.

Replacement Considerations

Direct replacements may include other 4N33 series variants such as the 4N33M or 4N33, provided the package style and electrical specifications are compatible. Verify pinout compatibility and isolation voltage ratings before substitution.