FOD2741BV

Overview

The FOD2741BV is a single-channel optically isolated amplifier manufactured by Fairchild Semiconductor, now onsemi. It integrates a precision programmable shunt reference with a phototransistor output optocoupler in an 8-pin DIP package. The device provides galvanic isolation with a rated insulation voltage of 5000 Vrms. Key electrical parameters include a forward current of 20 mA, a forward voltage of 1.5 V, and a reference voltage of 2.495 V. The phototransistor output supports a maximum collector current of 50 mA and a collector-emitter voltage of 30 V. The current transfer ratio ranges from 100% to 200%, with a maximum collector-emitter saturation voltage of 400 mV. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Integrates a precision programmable shunt reference with a phototransistor optocoupler for error amplification applications.
• Provides high-voltage galvanic isolation between input and output circuits.
• Features a standard 8-pin DIP package suitable for through-hole mounting.

Applications

• Switching power supply feedback loops
• Isolated error amplifier circuits
• Voltage regulation systems requiring optical isolation

Procurement Notes

Verify the manufacturer designation as onsemi due to corporate acquisition history. Confirm the specific suffix BV indicates the 8-pin DIP-W package variant. Check datasheet revisions for any changes in mechanical dimensions or electrical characteristics compared to earlier Fairchild releases. Ensure compliance with RoHS standards if required by the application environment. Validate that the component is not obsolete or subject to discontinuation notices before finalizing procurement plans.

Selection Notes

Select this component when a combined reference and isolation function is needed in a single package. The integrated 2.495 V reference simplifies circuit design for regulated power supplies. Consider the 5000 Vrms isolation rating for safety-critical applications. Evaluate the 100-200% current transfer ratio for gain requirements. Compare against surface-mount alternatives like the ASDV variant if PCB space constraints exist.

Part Context

The FOD2741 series belongs to the family of optically isolated amplifiers designed for power management. It combines the functionality of a voltage reference with signal isolation. Other variants in the series include different packaging options such as SMD configurations. The device serves as a compact solution for replacing discrete reference and optocoupler combinations in industrial and consumer electronics.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Verify cross-reference availability through official distributor channels if direct replacement is necessary.