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INA181-Q1

ACTIVE

AEC-Q100, 26V, bi-directional, 350kHz current sense amplifier

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Data sheet

INA181-Q1

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, Low-side Capable Rating Automotive Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.8, 1 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 TI functional safety category Functional Safety-Capable 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, Low-side Capable Rating Automotive Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.8, 1 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm) SOT-SC70 (DCK) 6 4.2 mm² (2 mm × 2.1 mm)
  • 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): –0.2V to 26V
  • High bandwidth: 350kHz (A1 devices)
  • Offset voltage:
    • ±150µV (maximum) at VCM = 0V
    • ±500µV (maximum) at VCM = 12V
  • Output slew rate: 2V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1µV/°C offset drift (maximum)
  • Gain options:
    • 20V/V (A1 devices)
    • 50V/V (A2 devices)
    • 100V/V (A3 devices)
    • 200V/V (A4 devices)
  • Quiescent current: 260µA maximum (INA181-Q1)
  • 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): –0.2V to 26V
  • High bandwidth: 350kHz (A1 devices)
  • Offset voltage:
    • ±150µV (maximum) at VCM = 0V
    • ±500µV (maximum) at VCM = 12V
  • Output slew rate: 2V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1µV/°C offset drift (maximum)
  • Gain options:
    • 20V/V (A1 devices)
    • 50V/V (A2 devices)
    • 100V/V (A3 devices)
    • 200V/V (A4 devices)
  • Quiescent current: 260µA maximum (INA181-Q1)

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 –0.2V to 26V, independent of the supply voltage. The INAx181-Q1 family integrates a matched resistor gain network in four, fixed-gain device options: 20V/V, 50V/V, 100V/V, or 200V/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 260µA; whereas, the dual-channel INA2181-Q1 draws a maximum supply current of 500µA, and the quad-channel INA4181-Q1 draws a maximum supply current of 900µA.

The INA181-Q1 is available in both the 6-pin, SOT-23 and SC70 packages. 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.

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 –0.2V to 26V, independent of the supply voltage. The INAx181-Q1 family integrates a matched resistor gain network in four, fixed-gain device options: 20V/V, 50V/V, 100V/V, or 200V/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 260µA; whereas, the dual-channel INA2181-Q1 draws a maximum supply current of 500µA, and the quad-channel INA4181-Q1 draws a maximum supply current of 900µA.

The INA181-Q1 is available in both the 6-pin, SOT-23 and SC70 packages. 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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INA180-Q1 ACTIVE AEC-Q100, 26V, 350kHz current sense amplifier The INA180-Q1 offers the same performance for uni-directional applications.

Technical documentation

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* Data sheet INAx181-Q1 Automotive, Bidirectional, Low- and High-Side Voltage Output, Current-Sense Amplifiers datasheet (Rev. F) PDF | HTML Oct 31, 2024
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
Functional safety information INAx18x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. B) PDF | HTML Oct 30, 2023
Application brief 12-V Battery Monitoring in an Automotive Module (Rev. A) PDF | HTML Mar 10, 2022
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML Dec 2, 2020
Application note Evaluating Current Sensing Amplifiers in Body Control Modules Using Simulation Dec 16, 2019
Circuit design Adjustable-gain, current-output, high-side current-sensing circuit Aug 9, 2019
Circuit design Fast-response overcurrent event detection circuit May 27, 2019
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 brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) Sep 5, 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

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: 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
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Simulation model

INA181 TINA-TI Spice Model (Rev. A)

SBOMAD3B (49 KB) - TINA-TI Spice model
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Simulation model

INA181A1 PSpice Model

SBOMBB7.ZIP (21 KB) - PSpice model
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Simulation model

INA181A2 PSpice Model

SBOMBB8.ZIP (22 KB) - PSpice model
Supported products & hardware
Simulation model

INA181A3 PSpice Model

SBOMBF2.ZIP (22 KB) - PSpice model
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Simulation model

INA181A4 PSpice Model

SBOMBC5.ZIP (21 KB) - PSpice model
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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 (...)

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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 (...)
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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 (...)

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Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 6 Ultra Librarian
SOT-SC70 (DCK) 6 Ultra Librarian
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