Product details


Common mode voltage (Max) (V) 26 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 80 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 1 Gain error (%) 0.25 Gain error drift (+/-) (Max) (ppm/°C) 50 CMRR (Min) (dB) 110 Bandwidth (kHz) 3.5 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.35 Digital interface I2C, SMBus Features Alert Function, Bi-directional, Low-side Capable Resolution (Bits) 13 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current/voltage/power monitors

Package | Pins | Size

VQFN (RGV) 16 16 mm² 4 x 4 open-in-new Find other Current/voltage/power monitors


  • Senses Bus Voltages From 0 V to 26 V
  • Reports Shunt and Bus Voltage
  • High Accuracy:
    • Offset Voltage: ±80 µV (max)
    • Gain Error: 0.25% (max)
  • Configurable Averaging Options
  • Four Programmable Addresses
  • Programmable Alert and Warning Outputs
  • Power-Supply Operation: 2.7 V to 5.5 V
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The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221 senses current on buses that can vary from 0 V to 26 V. The device is powered from a single 2.7-V to 5.5-V supply, and draws 350 µA (typ) of supply current. The INA3221 is specified over the operating temperature range of –40°C to +125°C. The I2C- and SMBUS-compatible interface features four programmable addresses.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet INA3221 Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface datasheet (Rev. B) Mar. 22, 2016
Technical articles How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note Current Sensing Applications in Communication Infrastructure Equipment (Rev. A) Dec. 29, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
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 Digital Interfaces for Current Sensing Devices Jun. 30, 2017
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note Energy and Power Monitoring with Digital Current Sensors May 25, 2017
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
Application note Understanding the I2C Bus Jun. 30, 2015
User guide INA3221EVM Evaluation Board and Software Tutorial Apr. 23, 2012

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 INA3221EVM is a platform for evaluating the performance of the INA3221 under various signal, shunt, and supply conditions.

  • USB Power and I/O
  • Small Form Factor
  • Simple Software Interface
  • Software development

    SBOC424.ZIP (2520 KB)
    Linux Driver for INA3221
    INA3221SW-LINUX The Linux driver supports the INA3221 Triple Current/Power Monitor. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
    Linux Mainline Status

    Available in Linux Main line: Yes
    Available through N/A

    Supported Devices:
    • ina3221
    Linux (...)
    SBOC425.ZIP (100553 KB)

    Design tools & simulation

    SBOM761.ZIP (56 KB) - IBIS 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
    SBOR020A.ZIP (525 KB)

    Reference designs

    Integrated power supply reference design for NXP i.MX 7D processor
    TIDA-050034 TIDA-050034 is a fully functional development board combining a TI PMIC, TPS65218DO, with NXP i.MX 7Dual Application Processor.

    The hardware design consists of DDR3L SDRAM (2x512MB), 64MB Serial NOR Flash, 8GB eMMC 5.0 iNAND, SD Card interface v3.0, 50 pin LCD Connector for external TFT display (...)

    document-generic Schematic document-generic User guide
    Integrated power supply reference design for NXP i.MX 6ULL processor
    TIDA-050043 This reference design is a fully functional development board powering an NXP™ i.MX 6ULL application processor from a TPS6521815 PMIC. The hardware design consists of DDR3L SDRAM (512 MB), 32-MB Serial NOR Flash, 8-GB eMMC 5.0 iNAND, SD Card interface v3.0, dual-channel 100Base-T Ethernet (...)
    document-generic Schematic document-generic User guide
    Integrated power supply reference design for NXP i.MX 8M mini processor
    TIDA-050038 TIDA-050038 is a system-on-module (SoM) development board integrating two TI PMICs, TPS6521825 and LP873347, with the NXP™ i.MX 8M Mini Application Processor. The hardware design also includes LPDDR4 SDRAM (2GB, x32-bit), QSPI NORFlash (32MB), 16GB eMMC 5.1, 32-kHz RTC oscillator, WiFi (...)
    document-generic Schematic document-generic User guide

    CAD/CAE symbols

    Package Pins Download
    VQFN (RGV) 16 View options

    Ordering & quality

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    • RoHS
    • REACH
    • Device marking
    • Lead finish/Ball material
    • MSL rating/Peak reflow
    • MTBF/FIT estimates
    • Material content
    • Qualification summary
    • Ongoing reliability monitoring

    Support & training

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