FOD2741BS

Overview

The FOD2741BS is a single-channel optically isolated error amplifier manufactured by Fairchild Semiconductor. It integrates a precision programmable shunt reference with a phototransistor output optocoupler in an 8-SMD package. The device provides high isolation voltage of 5000 Vrms and operates within a temperature range of -40°C to +85°C. Key electrical parameters include a nominal current transfer ratio of 100%, a maximum collector-emitter breakdown voltage of 70 V, and a maximum forward current of 20 mA. The component is RoHS compliant and features UL recognition and VDE approval for safety standards.

Feature Summary

• Integrates a precision programmable shunt reference with an optocoupler for closed-loop control applications
• Provides high-voltage electrical isolation between input and output circuits
• Offers stable error amplification characteristics suitable for feedback loops

Applications

• Switching power supply error amplification
• Flyback converter feedback circuits
• Isolated voltage regulation systems

Procurement Notes

Verify the manufacturer status as onsemi has acquired Fairchild Semiconductor's assets. Confirm the specific suffix 'BS' denotes the surface-mount DIP-8 package variant. Check for obsolescence notices or lifecycle changes, as some sources indicate potential discontinuation. Ensure compliance with current RoHS directives and verify that the UL/VDE certifications remain valid for the production batch.

Selection Notes

Select this component when a compact solution combining a reference and optocoupler is required. The SMD package facilitates automated assembly. Consider the 5000 Vrms isolation rating for safety-critical designs. Verify that the 20 mA forward current capability meets the LED drive requirements of the target circuit. Compare thermal performance against through-hole alternatives if heat dissipation is a constraint.

Part Context

The FOD2741 series belongs to the family of optically isolated error amplifiers designed for power management. These devices simplify circuit design by replacing discrete components with a single integrated unit. The BS suffix typically indicates a surface-mount version of the standard DIP package, offering space-saving benefits for modern PCB layouts while maintaining the functional integrity of the original FOD2741B design.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.