FOD2742CR2

Overview

The FOD2742CR2 is an optically isolated amplifier manufactured by Fairchild Semiconductor. It integrates a precision programmable shunt reference, specifically the KA431, with an optocoupler to provide high-performance isolation in feedback loops. The device features a single channel configuration with a phototransistor output type. It operates within a temperature range of -25°C to +85°C and utilizes a SOIC-8 surface mount package. Key electrical characteristics include a maximum forward voltage of 1.5V and an insulation voltage rating of 2500 Vrms.

Feature Summary

• Integrates a precision programmable shunt reference with an optocoupler for enhanced signal integrity
• Provides galvanic isolation between input and output circuits
• Designed for error amplifier applications requiring high linearity

Applications

• Switching power supply feedback loops
• Linear optocoupler applications
• Error amplifier circuits

Procurement Notes

Verify component authenticity through authorized distributors due to potential availability from multiple manufacturers including onsemi following industry consolidations. Confirm package suffixes match specific reel or tape requirements. Check current lifecycle status as some variants may be discontinued or subject to last-time buy notices. Ensure RoHS compliance documentation aligns with project specifications.

Selection Notes

Select this component when precise voltage referencing and linear isolation are required simultaneously. The integrated KA431 reduces external component count compared to discrete solutions. Consider thermal management capabilities within the SOIC-8 package for high-density designs. Verify input current limits and current transfer ratio requirements against system load conditions.

Part Context

This part belongs to the FOD2742 series of optically isolated amplifiers. It represents a specialized category combining analog control references with optical transmission. Similar parts in the family include FOD2741 and FOD2742A/B/C variants, differing primarily in packaging, speed, or specific reference calibration. The CR2 suffix typically denotes a specific tape-and-reel packaging format.

Replacement Considerations

Direct replacements include FOD2742B and FOD2742C from Fairchild or onsemi. Verify pin compatibility and electrical parameters before substitution. Alternative optocouplers lacking integrated references require additional external components.