FOD2741C

Overview

The FOD2741C is an optically isolated error amplifier manufactured by onsemi. It integrates a GaAsP infrared LED with a photovoltaic output stage to provide high-voltage isolation. The device features a 5000 Vrms insulation voltage and operates within a temperature range of -40°C to +85°C. It utilizes an 8-pin PDIP package for through-hole mounting. The component serves as a direct replacement for linear optocouplers in precision applications, offering galvanic isolation between input control circuits and high-voltage feedback loops.

Feature Summary

• Integrates a photovoltaic output stage for precise error amplification
• Provides high-voltage galvanic isolation via infrared LED coupling
• Designed for use in closed-loop power supply feedback systems

Applications

• Switching power supply error amplification
• Linear regulator feedback loops
• Battery management system isolation

Procurement Notes

Verify the current manufacturing status before procurement, as the FOD2741C is listed as obsolete in multiple distributor databases. Confirm availability of alternative packages or series members if this specific part number is discontinued. Ensure that the selected substitute maintains the same photovoltaic output characteristics and isolation voltage ratings required by the design.

Selection Notes

Select this component when a photovoltaic output optocoupler is required for error signal transmission across an isolation barrier. It is suitable for designs needing low offset voltage and high linearity in feedback paths. Consider the PDIP-8 package constraints and thermal dissipation requirements relative to the application environment. Verify compatibility with existing PCB footprints if replacing legacy designs.

Part Context

The FOD2741C belongs to the FOD2741 family of optically isolated error amplifiers from onsemi. This series includes variants such as the FOD2741A and FOD2741B, which share similar functional architectures but may differ in packaging or specific electrical tolerances. These devices are engineered to replace traditional linear optocouplers in high-performance power conversion applications requiring precise signal transfer.

Replacement Considerations

The FOD2741C is marked as obsolete. Designers should evaluate substitutes from the same FOD2741 family or equivalent photovoltaic output optocouplers. Verify that any replacement matches the 5000 Vrms isolation rating and photovoltaic output configuration to ensure circuit functionality remains intact.