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INA2181

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26V, dual channel, bi-directional, 350kHz current sense amplifier

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Data sheet

INA2181

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, Dual Channel, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.5 Number of channels 2 Comparators (#) 0 Gain error (%) 0.8 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, Dual Channel, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.5 Number of channels 2 Comparators (#) 0 Gain error (%) 0.8 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² (3 mm × 4.9 mm) WSON (DSQ) 10 4 mm² (2 mm × 2 mm)
  • Common-mode range (V CM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±150 µV (maximum) at V CM = 0 V
    • ±500 µV (maximum) at V CM = 12 V
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1-µV/°C offset drift (maximum)
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA maximum (INA181)
  • Common-mode range (V CM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±150 µV (maximum) at V CM = 0 V
    • ±500 µV (maximum) at V CM = 12 V
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1-µV/°C offset drift (maximum)
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA maximum (INA181)

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in both the 6-pin, SOT-23 and SC70 packages. The INA2181 is available in 10-pin, VSSOP and WSON packages. The INA4181 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in both the 6-pin, SOT-23 and SC70 packages. The INA2181 is available in 10-pin, VSSOP and WSON packages. The INA4181 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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INA2180 ACTIVE 26V, dual channel, 350kHz current sense amplifier The INA2180 offers the same performance for uni-directional applications

Technical documentation

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Top documentation Type Title Format options Date
* Data sheet INAx181 Bidirectional,Low- and High-Side Voltage Output,Current-Sense Amplifiers datasheet (Rev. H) PDF | HTML Nov 29, 2023
Application note Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) PDF | HTML Apr 27, 2026
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML Nov 18, 2024
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application brief Common Uses for Multichannel Current Monitoring (Rev. A) PDF | HTML Sep 27, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Circuit design Circuit to measure multiple redundant source currents with singled-ended signal PDF | HTML Jun 28, 2021
Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML Dec 2, 2020
E-book E-book: An engineer’s guide to industrial robot designs Feb 12, 2020
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) Mar 6, 2019
Application note Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout Oct 27, 2017
Application note Low Cost Bidirectional Current Sensing Using INA181 Jul 28, 2017
Application brief Low-Side Current Sense Circuit Integration Mar 30, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

INA2180-2181EVM — INA2180-2181 Output Current Sense Amplifier Evaluation Board

The INA2180 is an integrated current sense monitor solution that provides ease of use and high performance for cost-sensitive applications. The INA2181 shares the same capabilities with the support for bidirectional current measurements. The INA2180-2181EVM is intended to provide basic functional (...)
User guide: PDF
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Simulation model

INA181 PSpice Model (Rev. B)

SBOMAD5B.ZIP (2070 KB) - PSpice model
Supported products & hardware
Simulation model

INA181 TINA-TI Reference Design (Rev. B)

SBOMAD4B.TSC (2820 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

INA181 TINA-TI Spice Model (Rev. A)

SBOMAD3B (49 KB) - TINA-TI Spice model
Supported products & hardware
Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

Supported products & hardware
Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware
Reference design

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGS) 10 Ultra Librarian
WSON (DSQ) 10 Ultra Librarian
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