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Product details

Parameters

Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) -0.2 Input offset (+/-) (Max) (uV) 150 Input offset drift (+/-) (Typ) (uV/C) 0.2 Gain (V/V) 100, 20, 200, 50 Gain error (%) 1 Gain error drift (+/-) (Max) (ppm/°C) 20 CMRR (Min) (dB) 84 Bandwidth (kHz) 350, 210, 150, 105 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.3 Number of channels (#) 1 Comparators (#) 0 Features Bi-directional, Low-side Capable Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Current sense amplifiers analog output

Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C ≤ TA ≤ +125°C
    • HBM ESD classification level 2
    • CDM ESD classification level C6
  • Functional Safety-Capable
  • Common-mode range (VCM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±150 µV (maximum) at VCM = 0 V
    • ±500 µV (maximum) at VCM = 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-Q1)

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Description

The INA181-Q1, INA2181-Q1, and INA4181-Q1 (INAx181-Q1) 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-Q1 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-Q1 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181-Q1 draws a maximum supply current of 500 µA, and the quad-channel INA4181-Q1 draws a maximum supply current of 900 µA.

The INA181-Q1 is available in a 6-pin, SOT-23 package. The INA2181-Q1 is available in a 10-pin, VSSOP package. The INA4181-Q1 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
* Datasheet INAx181-Q1 Automotive, Bidirectional, Low- and High-side Voltage Output, Current-Sense Amplifiers datasheet (Rev. C) Apr. 30, 2020
Technical articles How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) Dec. 02, 2020
Functional safety information INAx180-Q1, INAx181-Q1 Functional Safety Fit Rate, FMD and Pin FMA (Rev. A) Sep. 22, 2020
Application note Evaluating Current Sensing Amplifiers in Body Control Modules Using Simulation Dec. 16, 2019
Application note Adjustable-gain, current-output, high-side current-sensing circuit Aug. 09, 2019
Application note Fast-response overcurrent event detection circuit May 27, 2019
Application note 12-V Battery Monitoring in an Automotive Module Mar. 06, 2019
Application note Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) Mar. 06, 2019
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Selection guide Current Sense Amplifiers (Rev. D) Apr. 04, 2018
Application note Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout Oct. 27, 2017
Application note Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) Sep. 05, 2017
Application note Low Cost Bidirectional Current Sensing Using INA181 Jul. 28, 2017
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note Low-Side Current Sense Circuit Integration Mar. 30, 2017
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
User guide INA180-181 EVM User's Guide Jan. 19, 2016

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
10
Description
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 (...)
Features
  • Evaluation of all gain options for the INA180Ax and INA181Ax
  • Ease of access to device pins with test points
  • Capability to evaluate high-side and low-side configurations

Design tools & simulation

SIMULATION MODEL Download
SBOMAD3A.ZIP (35 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SBOMAD4B.TSC (2820 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOMAD5B.ZIP (2070 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBB7.ZIP (21 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBB8.ZIP (22 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBC5.ZIP (21 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBF2.ZIP (22 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide
CALCULATION TOOL Download
SBOR020A.ZIP (525 KB)

Reference designs

REFERENCE DESIGNS Download
Current Shunt Monitor with Transient Robustness Reference Design
TIDA-00302 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 (...)

document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

Ordering & quality

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  • Lead finish/Ball material
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  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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