SFH618A-3

Overview

The SFH618A-3 is a high-speed phototransistor output optocoupler featuring an infrared-emitting diode and a silicon phototransistor. It provides electrical isolation between input and output circuits with a high common-mode transient immunity. The device is designed for applications requiring fast switching speeds and reliable signal transmission across isolated boundaries.

Feature Summary

• High common-mode transient immunity for noise-resistant operation
• Fast switching speed suitable for digital signal transmission
• Integrated infrared LED coupled with silicon phototransistor

Applications

• Digital communication interfaces
• Signal isolation in industrial control systems
• Microprocessor system isolation

Procurement Notes

Verify the specific suffix 'A-3' against the manufacturer's current datasheet to confirm pinout configuration and packaging type. Ensure compliance with RoHS directives if required by your application standards. Cross-reference the ordering code with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when high-speed isolation is required alongside standard phototransistor output characteristics. Consider the collector-emitter voltage ratings and propagation delay specifications relative to your circuit's timing requirements. Evaluate thermal management needs based on the expected forward current of the internal LED.

Part Context

This part belongs to Vishay's SFH618 series of optocouplers, which are widely used for general-purpose isolation tasks. The series offers various package options and performance grades to suit different isolation voltage and speed requirements within electronic design projects.

Replacement Considerations

Check for direct replacements like the SFH618A-2 or SFH618A-4 from the same manufacturer, ensuring pin compatibility and identical electrical parameters. Verify that any substitute maintains the same isolation voltage rating and package dimensions for seamless integration.