FOD2741CSD

Overview

The FOD2741CSD is an optically isolated error amplifier manufactured by onsemi, designed for precision analog signal transmission across isolation barriers. It integrates a high-efficiency infrared LED emitter with an NPN phototransistor output stage within a single channel configuration. The device provides robust electrical isolation rated at 5000 Vrms, ensuring safety in high-voltage environments. Packaged in an SMD-DIP-8 surface mount format, it supports operation across a wide temperature range from -40°C to +85°C. Key electrical characteristics include a minimum current transfer ratio of 100% and a maximum collector-emitter saturation voltage of 400 mV, facilitating accurate feedback loop control in power conversion applications.

Feature Summary

• Integrates an error amplifier function combining optical isolation with linear signal amplification capabilities
• Provides high-voltage galvanic isolation between input and output circuits to prevent ground loops
• Features a compact surface-mount package design suitable for automated assembly processes

Applications

• Switching power supply feedback loops
• Motor drive control systems
• Industrial process control instrumentation

Procurement Notes

Verify the specific suffix designation against the manufacturer's latest datasheet to confirm pinout compatibility and performance specifications. Confirm RoHS compliance status and any recent product change notices that may affect lead times or material composition. Ensure the ordering part number matches the required package variant and thermal rating for the intended application environment.

Selection Notes

Select this component when precise linear isolation is required for error signal transmission rather than simple digital switching. Consider the current transfer ratio linearity and bandwidth requirements relative to the system's control loop stability. Evaluate the thermal management needs given the power dissipation limits and ensure the PCB layout accommodates the specified creepage and clearance distances for the isolation voltage rating.

Part Context

This device belongs to the FOD2741 series of optically isolated amplifiers, which are specialized optocouplers designed for linear applications. Unlike standard digital optocouplers, these devices maintain signal fidelity across the isolation barrier, making them suitable for closed-loop control systems where accuracy is critical. The series typically includes variants with different packaging options to suit various manufacturing constraints.

Replacement Considerations

Public confirmed substitute part numbers: FOD2741ASDV, FOD2741BSDV.