4N33-X009

Overview

The Vishay 4N33-X009 is a single-channel optoisolator featuring a GaAs infrared LED coupled to a photodarlington output with an accessible base terminal. It provides high current transfer ratio performance, specified at a minimum of 500% CTR at 10mA forward current. The device offers robust electrical isolation of 5300Vrms and operates within a wide temperature range from -55°C to 100°C. Packaged in a compact 6-SMD gull-wing configuration, it supports DC input signals and delivers up to 50mA collector current with a maximum collector-emitter voltage of 70V.

Feature Summary

• Integrates a photodarlington transistor output for high gain amplification
• Includes a dedicated base terminal for external control or speed adjustment
• Provides high isolation voltage rating for safety-critical applications

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Microcontroller interface circuits with noise immunity needs

Procurement Notes

Verify the specific suffix designation against the manufacturer's latest datasheet to confirm the exact Current Transfer Ratio binning and package variant. Ensure compliance with RoHS3 standards and check for any recent Product Change Notifications regarding mold compound or bond wire specifications before finalizing procurement.

Selection Notes

Select this component when high current gain is required without additional external amplification stages. The accessible base pin allows designers to modify switching speed or sensitivity by applying external bias. Compare against standard phototransistor variants if lower CTR or simpler packaging suffices for the application requirements.

Part Context

This part belongs to the 4N33 series of optocouplers, distinguished by its Darlington output structure which significantly increases current transfer ratio compared to standard phototransistor models like the 4N35. The X009 suffix indicates a specific surface-mount package option within Vishay's broader 4N33 family lineup.

Replacement Considerations

Direct substitutes include other Vishay 4N33 variants with different CTR bins or packages, such as 4N33-X001. Cross-brand equivalents may require verification of isolation voltage and pinout compatibility.