FOD2742CR1

Overview

The FOD2742CR1 is an optically isolated amplifier manufactured by Fairchild Semiconductor. It integrates a precision programmable shunt reference with an optocoupler featuring a phototransistor output. The device utilizes an 8-pin SOIC surface-mount package. Key electrical specifications include a maximum forward voltage of 1.5V, a maximum input current of 20 mA, and an isolation voltage of 2.5 kVrms. The current transfer ratio ranges from a minimum of 100% to a maximum of 200%. It supports single-channel operation with DC input.

Feature Summary

• Integrates a precision programmable shunt reference with an optocoupler for compact error amplification solutions
• Provides high-voltage isolation between input and output circuits to ensure system safety
• Features a phototransistor output stage suitable for driving logic or control interfaces

Applications

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

Procurement Notes

Verify the specific suffix CR1 against official onsemi/Fairchild documentation to confirm tape-and-reel packaging and quantity. Ensure the component matches the exact pinout and electrical ratings required for your design. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when a combined error amplifier and isolation barrier is needed in a small footprint. The integrated shunt reference simplifies circuit design compared to discrete solutions. Consider the 8-pin SOIC package constraints and the specific current transfer ratio requirements of the application. Verify that the 2.5 kVrms isolation rating meets the safety standards of the target equipment.

Part Context

The FOD2742 series belongs to Fairchild's family of optically isolated error amplifiers. These devices are designed to replace traditional transformer-coupled feedback methods in isolated power supplies. The series includes variants such as FOD2742A and FOD2742C, which share similar functional architectures but may differ in specific electrical characteristics or packaging options.

Replacement Considerations

Check for direct substitutes within the FOD2742 series, such as FOD2742B or FOD2742C, ensuring pin compatibility and matching electrical parameters. Verify if newer generations from onsemi offer equivalent performance with updated packaging or compliance certifications.