MAX4281ESA+

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4281ESA+ is a single-channel, open-loop, unity-gain-stable operational amplifier from the GainAmp family. It operates on a single +2.5V to +5.5V supply with a typical supply current of 320µA at +5V. The device features rail-to-rail outputs capable of driving a 1kΩ load and an input common-mode voltage range extending from 150mV below the negative supply to within 1.2V of the positive supply. Key electrical parameters include a gain-bandwidth product of 2MHz, a slew rate of 0.7V/µs, and an input offset voltage of ±0.5mV (max). It provides high-voltage fault protection for inputs up to ±17V.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Unity-gain stable open-loop architecture optimized for prototyping and flexible circuit configurations
• Rail-to-rail output stage maintains DC accuracy while driving loads down to 1kΩ
• Integrated high-voltage fault protection withstands ±17V at either input without excessive current draw

Instrumentation, Op Amps, Buffer Amps Applications

• Portable instruments and smart-card readers
• Infrared receivers and remote controls
• Low-side current-sense amplifiers
• Photodiode preamplifiers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'ESA+' against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with existing board layouts when replacing discrete op-amp resistor networks. Confirm availability status as distribution channels may report limited stock or discontinuation notices.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a unity-gain stable core is required for custom feedback networks rather than fixed internal gains. It serves as the foundational amplifier for the GainAmp family, allowing designers to prototype designs before committing to fixed-gain variants. Consider its 2MHz bandwidth and low power consumption for battery-operated applications requiring precise signal conditioning.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the Maxim Integrated GainAmp family, which combines precision amplifiers with factory-trimmed resistors. While other members like the MAX4174 offer fixed gains, the MAX4281 provides an open-loop solution. This family targets space-constrained designs by reducing external component counts and layout complexity in portable electronics.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct substitutes within the same family include the dual-channel MAX4282 and quad-channel MAX4284. Verify pinout compatibility and ensure the replacement meets the specific gain-bandwidth and supply current requirements of the original design.

Instrumentation, Op Amps, Buffer Amps FAQ

What is the input common-mode voltage range?

The input common-mode voltage range extends from 150mV below the negative supply to within 1.2V of the positive supply.

Does the MAX4281 support capacitive loads?

Yes, the amplifier is stable with capacitive loads up to 470pF without requiring an isolation resistor.

How does the MAX4281 differ from the MAX4174?

The MAX4281 is an open-loop, unity-gain-stable op amp, whereas the MAX4174 is a fixed-gain amplifier with internal precision resistors.