FOD2742AR2V

Overview

The FOD2742AR2V is an optically isolated error amplifier manufactured by Fairchild Semiconductor. It integrates a GaAsP infrared LED with an NPN phototransistor output in an 8-pin SOIC package. The device provides 2500 Vrms isolation voltage and operates within a temperature range of -25°C to +85°C. Key electrical parameters include a minimum current transfer ratio of 100%, a maximum collector-emitter saturation voltage of 400 mV, and a reference voltage of 2.495 V. It supports a maximum forward current of 20 mA and features UL recognition and VDE approval for safety compliance.

Feature Summary

• Integrates an error amplifier function with optical isolation for feedback control applications
• Provides high-voltage isolation between input and output circuits
• Features a compact surface-mount SOIC-8 package design

Applications

• Switching power supply feedback loops
• Flyback converter control circuits
• Offline AC/DC conversion systems

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor entity onsemi, noting that product lines may have transitioned. Confirm the specific suffix R2V corresponds to the required tape-and-reel packaging format rather than bulk. Ensure the component meets RoHS directives and holds necessary safety certifications such as UL and VDE for your target market regulations before finalizing procurement orders.

Selection Notes

Select this component when a combined error amplifier and optocoupler solution is required to reduce board space and component count. The integrated reference voltage simplifies circuit design compared to discrete solutions. Ensure the operating temperature range and isolation voltage requirements align with the specific power supply topology and safety standards mandated by the end application.

Part Context

This part belongs to the FOD2742B series of optically isolated amplifiers. It is designed specifically for use in offline switch-mode power supplies where galvanic isolation is critical. The series typically includes variants with different packaging options and reel configurations, serving as a standard solution for primary-side regulation in consumer and industrial power adapters.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs if considering alternative manufacturers, as pinouts and electrical characteristics may vary significantly between different optocoupler families.