Current-Sense Amplifiers

Current-sense amplifiers (CSAs) monitor current flow through a shunt (sense) resistor and provide closed-loop feedback of system loads. Current-sense amps are optimized for a wide range of applications, including overcurrent protection and optimization of power monitoring systems. We offer a wide range of current-sense amplifiers for both high-side sensing and low-side sensing, as well as unidirectional or bidirectional current flow through the sense resistor.

All Current-Sense Amps 

Precision Current-Sense Amplifiers

Our broad portfolio of precision current-sense amplifiers help you measure multiple decades of current. Decrease your sense resistor impedance and improve system efficiency with our low offset current-sense amplifiers. Achieve faster signal processing and acquisition time for improved AC performance with our wideband current-sense amplifiers.

Precision CSAs 

High Voltage Current-Sense Amplifiers

Our high-side, high voltage current-sense amplifiers offer input ranges up to +76V and down to -20V. These high voltage CSAs are ideal for applications such as motor control, electrical instrumentation, automatic test equipment (ATE), automotive electronic control units, communications base stations, network routers, and servers.

High-Voltage CSAs 

Low-Power and Space-Saving Current-Sense Amplifiers

Our broad portfolio of nanoPower and Micropower current-sense amplifiers help maximize and extend system and battery life without compromising DC accuracy. These tiny CSAs are available in a variety of space-saving, small footprint packages, such as SC70, SOT23, and wafer level packages (WLP).

Low-Power and Space-Saving CSAs 

Current-Sense Amp Featured Products

How to Measure Current with the MAX4173 Current-Sense Amplifier and a Microcontroller

In this video, Sean uses the MAX4173 Evaluation Kit together with an Arduino® Uno to measure current. He also discusses the principle behind measuring current and why a current-sense amplifier is a very useful addition to this technique.

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Introduction to the MAX40056F/T/U Bidirectional Current Sense Amplifier with PWM-Rejection

This video provides an introduction to the MAX40056, a bi-directional current-sense amplifier with an input common-mode range that extends from -0.1Vto +65V together with protection against negative inductive kickback voltages to -5V.

Introduction to the MAX40016 4-Decade Current Sense Amplifier with Integrated Rsense Element

This video provides an introduction to the MAX40016, a very wide range current sense amplifier (CSA) with internal sense element that senses from less than 300μA to greater than 3A current range.  

Evaluation Kit for the MAX44298


Assesses the MAX44298 precision power monitor with very low offset for low-side monitoring.

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Evaluation Kit for the MAX44284


Demonstrates the high-precision real-time current monitoring of the MAX44284 current-sense amplifier.

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Dual-Channel Current Sense Peripheral Module


Interfaces the MAX44285 dual-channel high-side current-sense amplifier to any system that utilizes Pmod™-compatible expansion ports.

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DC Motor Current Sensing in a PWM Environment with the MAX40056 Current-Sense Amplifier

DC Motor Current Sensing in a PWM Environment with the MAX40056 Current-Sense Amplifier

Ashwin demonstrates how the MAX40056 bidirectional current-sense amplifier performs rejection of high common-mode PWM signals to accurately measure torque and speed in a three-phase brushless DC (BLDC) motor system.

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Precision Uni and Bidirectional, Current-Sense Amplifiers


These ICs are single-supply, high-accuracy current-sense amplifiers with a high input common-mode range that extends from -20V to +75V.

36V, Input Common-Mode, High-Precision, Low-Power Current-Sense Amplifier


This current-sense amplifier offers precision accuracy specifications of 2µV VOS and gain error of 0.05%. It operates with a 1.7V to 5.5V single supply and is optimized for very low power operation with only 21µA of quiescent current.

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Current-Sense Amp Design Resources

Technical Documents

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