FOD2742A

Overview

The FOD2742A is an optically isolated error amplifier integrating a precision reference, error amplifier, and high-speed phototransistor output in a single SOIC-8 package. It provides a stable 2.5V reference voltage with a current transfer ratio (CTR) ranging from 100% to 200%. The device offers 2,500 Vrms isolation voltage and supports a maximum collector current of 50 mA. Operating temperatures range from -25°C to +85°C.

Feature Summary

• Integrates precision reference, error amplifier, and phototransistor output
• Provides stable 2.5V reference voltage
• Ensures high-speed signal transmission with 2,500 Vrms isolation

Applications

• Switch-mode power supply feedback loops
• Isolated voltage regulation circuits
• Industrial control systems requiring galvanic isolation

Procurement Notes

Verify the specific suffix for packaging configuration, as variants exist in tube or reel formats. Confirm end-of-life status with the manufacturer prior to design finalization. Ensure compliance with RoHS directives if required by the target market regulations.

Selection Notes

Select this component when a compact solution combining reference generation and error amplification is required. The integrated design reduces external component count compared to discrete solutions. Verify that the 100% to 200% CTR range meets the loop stability requirements of the specific application.

Part Context

This part belongs to the FOD2742B series of optically isolated amplifiers. It shares functional similarities with other onsemi error amplifier optocouplers but is distinguished by its specific 2.5V reference and CTR specifications. It serves as a specialized alternative to general-purpose optocouplers in precision feedback applications.

Replacement Considerations

Direct substitutes include the FOD2742BV and FOD2742BR2. Verify pinout compatibility and electrical parameter alignment before substitution. Note that suffixes may indicate different packaging rather than functional changes.