FOD2741ASD

Overview

The FOD2741ASD is an optically isolated error amplifier manufactured by Fairchild Semiconductor. It integrates a precision programmable shunt reference with an NPN phototransistor output coupler in an 8-pin SMD-DIP package. The device provides high isolation voltage and low temperature coefficient for feedback applications.

Feature Summary

• Integrates KA431 precision programmable shunt reference with optocoupler
• Provides galvanic isolation between control and power circuits
• Features low temperature coefficient for stable reference performance

Applications

• Isolated AC to DC power supplies
• DC/DC converter feedback loops
• Switching power supply regulation

Procurement Notes

Verify the specific suffix ASD against current onsemi or Fairchild documentation to confirm pinout and packaging details, as legacy part numbers may have variations. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability varies by region and production lifecycle stage.

Selection Notes

Select this component when a combined error amplifier and isolation barrier is required in a compact surface-mount form factor. Ensure the operating temperature range meets system requirements and that the isolation voltage rating satisfies safety standards for the target application environment.

Part Context

This part belongs to the FOD2741 series of optically isolated amplifiers. It is designed to replace discrete resistor divider and optocoupler combinations, simplifying circuit design for isolated power conversion systems while maintaining precise voltage regulation capabilities.

Replacement Considerations

Check for direct pin-compatible replacements within the same family, such as FOD2741B variants, ensuring functional equivalence in isolation voltage and reference tolerance before substitution.