Product details


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) 0.5 Number of channels (#) 1 Comparators (#) 1 Features Alert Function, Low-side Capable Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

VSSOP (DGS) 10 9 mm² 3 x 3 WSON (DSG) 8 4 mm² 2 x 2 open-in-new Find other Current sense amplifiers analog output


  • Common-mode input range: –0.2 V to +26 V
  • High accuracy amplifier:
    • Offset voltage at TA = 25°C
      • 500 µV (maximum) at VCM = 12 V
      • 150 µV (maximum) at VCM = 0 V
    • Offset voltage drift: 1 µV/°C (maximum)
    • Gain error: 1% (maximum) at 25°C
    • Gain error drift: 20 ppm/°C (maximum)
  • Available amplifier gains:
    • INA381A1: 20 V/V
    • INA381A2: 50 V/V
    • INA381A3: 100 V/V
    • INA381A4: 200 V/V
  • Open-drain comparator:
    • Hysteresis: 50 mV
    • Propagation delay: 400 ns (typ)
    • Alert threshold set through external reference voltage
    • Supports transparent and latching modes
  • Packages: VSSOP-10 and WSON-8

All trademarks are the property of their respective owners.

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The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in two modes: transparent or latched. In transparent mode, the output status follows the input state. In latched mode, the alert output is cleared only when the latch is reset. The standalone comparator large-signal alert response time is less than 2 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection response time provided by the INA381 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C, and is available in 8-pin WSON and 10-pin VSSOP packages.



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Technical documentation

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Type Title Date
* Data sheet INA381 26-V, High-Speed, Current Sense Amplifier With Integrated Comparator datasheet (Rev. B) Oct. 10, 2019
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application Jun. 14, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Improving Power Amplifier Efficiency with Current Monitors (Rev. A) Dec. 29, 2020
Application note Current sensing in high‐power USB Type‐C applications Dec. 21, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Application note Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) Mar. 06, 2019
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Application note Overcurrent event detection circuit Jul. 31, 2018
Application note Measuring Current to Handle Multiple Out-of-Range Conditions (Rev. B) May 18, 2018
Application note Overcurrent and Out-of-Range Protections (Rev. C) May 18, 2018
Selection guide Current Sense Amplifiers (Rev. D) Apr. 04, 2018
User guide INA381EVM User's Guide Dec. 14, 2017
Application note Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) Sep. 05, 2017
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017

Design & development

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

Hardware development

document-generic User guide
The INA381 is a current sense monitor solution with an integrated comparator for detecting overcurrent conditions that provides ease of use and high performance for cost-sensitive applications.  The INA381EVM is intended to provide basic functional evaluation of the device family. The fixture (...)
  • Evaluation of the INA381x in all gain options
  • Test points to allow ease of acess to device pins
  • Capability to evaluate both high- and low-side configurations

Design tools & simulation

SBOMAL8.TSC (5235 KB) - TINA-TI Reference Design
SBOMAL9.ZIP (40 KB) - TINA-TI Spice Model
SBOMBC0.ZIP (29 KB) - PSpice Model
SBOMBD6.ZIP (29 KB) - TISpice Model
SBOMBF3.ZIP (28 KB) - PSpice Model
SBOMBF6.ZIP (28 KB) - PSpice Model
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 (...)
  • 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
  • (...)
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
SBOC519.ZIP (10 KB)
SBOC520.ZIP (11 KB)
SBOR020B.ZIP (572 KB)

Reference designs

参考设计 Download
High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic document-generic User guide
参考设计 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
VSSOP (DGS) 10 View options
WSON (DSG) 8 View options

Ordering & quality

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Support & training

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