MAX4081FAUA+

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4081FAUA+ is a high-side, bidirectional current-sense amplifier from Analog Devices/Maxim Integrated. It features a wide input common-mode voltage range of 4.5V to 76V, independent of the supply voltage. The device provides a gain of 5V/V and operates over an automotive temperature range of -40°C to +125°C. Key electrical specifications include a maximum supply current of 190µA, a typical bandwidth of 150kHz, and a minimum common-mode rejection ratio of 100dB. It is housed in an 8-pin µMAX package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Bidirectional sensing capability for monitoring both charge and discharge currents
• Wide 4.5V to 76V common-mode input range independent of supply voltage
• High accuracy with low input offset voltage and gain error
• Single output pin indicates polarity without separate logic outputs

Instrumentation, Op Amps, Buffer Amps Applications

• Automotive battery monitoring (12V, 24V, or 42V systems)
• 48V telecom and backplane current measurement
• Bidirectional motor control applications
• Smart battery pack management systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'FAUA+' corresponds to the required gain, package type, and RoHS compliance status. Confirm that the 8-pin µMAX footprint matches the design layout. Ensure the operating environment stays within the specified -40°C to +125°C temperature range for guaranteed performance.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when bidirectional high-side current monitoring is required at voltages up to 76V. The 5V/V gain is suitable for applications requiring larger sense voltages across the resistor. Consider the external reference inputs necessary for setting the zero-current output level in bidirectional configurations.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the MAX4080/MAX4081 family of high-side current-sense amplifiers. While the MAX4080 offers unidirectional sensing, the MAX4081 variant supports bidirectional flow. The 'F' suffix denotes a fixed gain of 5V/V, distinguishing it from the T (20V/V) and S (60V/V) versions.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct replacements within the same family include MAX4081TAUA+ (20V/V gain) and MAX4081SAUA+ (60V/V gain). Verify that the alternative gain version meets the full-scale output requirements of the application circuit.