INA181

SOT-23 (DBV)

5 mm² 2.9 x 1.6

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 a 6-pin, SOT-23 package. 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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Technical documentation

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	Type	Title	Date
*	Data sheet	INAx181 Bidirectional, Low- and High-Side Voltage Output, Current-Sense Amplifiers datasheet (Rev. G)	05 May 2020
	Selection guide	Current Sense Amplifiers (Rev. E)	20 Sep 2021
	Technical article	Solving the multidecade current-measurement challenge in your 48-V BMS application	14 Jun 2021
	Technical article	How current-sense amplifiers monitor satellite health	08 Feb 2021
	Application note	Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A)	02 Dec 2020
	E-book	Ein Techniker-Leitfaden für Industrieroboter-Designs	25 Mar 2020
	E-book	E-book: An engineer’s guide to industrial robot designs	12 Feb 2020
	Application note	Adjustable-gain, current-output, high-side current-sensing circuit	09 Aug 2019
	Application note	Fast-response overcurrent event detection circuit	27 May 2019
	Application note	Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D)	06 Mar 2019
	Technical article	A key to accurate system thermal management: monitoring both current flow and temperature	04 Oct 2018
	Application note	Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout	27 Oct 2017
	Application note	Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B)	05 Sep 2017
	Application note	Low Cost Bidirectional Current Sensing Using INA181	28 Jul 2017
	Technical article	Precise constant current regulation helps advance fast-charging	15 Jun 2017
	Application note	Low-Side Current Sense Circuit Integration	30 Mar 2017
	User guide	INA180-181 EVM User's Guide	19 Jan 2016

Design & development

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

Evaluation board

INA180-181EVM — INA180 and INA181 evaluation module

The INA180 is an Op-Amp current sense integration circuit that provides ease of use and high performancce. The INA181 has the same capabilities of the INA180 but with the addition of the reference pin that enables bidirectional current measurements. The INA180-181EVM is intended to provide basic (...)

User guide

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Simulation model

INA181 TINA-TI Spice Model (Rev. A)

SBOMAD3A.ZIP (35 KB) - TINA-TI Spice Model

Simulation model

INA181 TINA-TI Reference Design (Rev. B)

SBOMAD4B.TSC (2820 KB) - TINA-TI Reference Design

Simulation model

INA181 PSpice Model (Rev. B)

SBOMAD5B.ZIP (2070 KB) - PSpice Model

Simulation model

INA181A1 PSpice Model

SBOMBB7.ZIP (21 KB) - PSpice Model

Simulation model

INA181A2 PSpice Model

SBOMBB8.ZIP (22 KB) - PSpice Model

Simulation model

INA181A4 PSpice Model

SBOMBC5.ZIP (21 KB) - PSpice Model

Simulation model

INA181A3 PSpice Model

SBOMBF2.ZIP (22 KB) - PSpice Model

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)

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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

User guide

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Calculation tool

Current Sense Amplifier Comparison and Error Tool (Rev. C)

SBOR020C.ZIP (568 KB)

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