4N35-X009

Overview

The Vishay 4N35-X009 is a single-channel phototransistor optocoupler featuring an infrared LED and silicon NPN output. It provides 5000Vrms isolation via double molding. The device operates from -55°C to +100°C with a maximum collector-emitter voltage of 30V and continuous collector current of 50mA. Input forward current is rated at 60mA, with a typical forward voltage of 1.2V. The minimum current transfer ratio is 100% at 10mA input. Switching times are typically 10µs for both turn-on and turn-off. Coupling capacitance is less than 0.5pF.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Features a base-connected phototransistor for improved switching performance
• Ensures low input-to-output coupling capacitance for noise rejection

Applications

• AC mains detection circuits
• Reed relay driving applications
• Switch mode power supply feedback loops
• Telephone ring detection systems
• Logic ground isolation interfaces

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status and applicable safety certifications such as UL or VDE before integration. Ensure the selected variant matches the required isolation voltage and thermal operating range for the target environment.

Selection Notes

Select this component when a standard single-channel transistor output is required with high isolation voltage. Consider the 100% CTR requirement for signal integrity. Evaluate the 10µs switching speed against system timing constraints. Compare against other series members like the 4N38 if higher collector voltage is needed.

Part Context

This part belongs to the industry-standard 4N35 family of Vishay optocouplers. These devices utilize gallium arsenide LEDs coupled with silicon NPN phototransistors. The family is designed for general-purpose isolation in commercial plastic packages, offering reliable performance across various industrial and consumer electronic applications.

Replacement Considerations

Check datasheets for equivalent parts within the same Vishay family or cross-reference with other manufacturers' 4N35-compatible devices. Verify pinout compatibility and electrical parameter equivalence for direct substitution.