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INA3221

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26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts

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Data sheet

INA3221

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 13 Input offset (±) (max) (µV) 80 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 1 CMRR (min) (dB) 110 Iq (max) (mA) 0.35 Gain error (%) 0.25 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Low-side Capable Number of channels 3 Power measurement accuracy (%) 0.5 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) 0 Digital interface I2C, SMBus Resolution (Bits) 13 Input offset (±) (max) (µV) 80 Input offset drift (±) (max) (µV/°C) 0.5 Input offset drift (±) (typ) (µV/°C) 0.1 Voltage gain (V/V) 1 CMRR (min) (dB) 110 Iq (max) (mA) 0.35 Gain error (%) 0.25 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Low-side Capable Number of channels 3 Power measurement accuracy (%) 0.5 Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (RGV) 16 16 mm² (4 mm × 4 mm)
  • Senses bus voltages from 0V to 26V
  • Reports shunt and bus voltage
  • High accuracy:
    • Offset voltage: ±80µV (maximum)
    • Gain error: 0.25% (maximum)
  • Configurable averaging options
  • Four programmable addresses
  • Programmable alert and warning outputs
  • Power-supply operation: 2.7V to 5.5V
  • Senses bus voltages from 0V to 26V
  • Reports shunt and bus voltage
  • High accuracy:
    • Offset voltage: ±80µV (maximum)
    • Gain error: 0.25% (maximum)
  • Configurable averaging options
  • Four programmable addresses
  • Programmable alert and warning outputs
  • Power-supply operation: 2.7V to 5.5V

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 0V to 26V. The device is powered from a single 2.7V to 5.5V supply, and draws 350µA (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.

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 0V to 26V. The device is powered from a single 2.7V to 5.5V supply, and draws 350µA (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

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Top documentation Type Title Format options Date
* Data sheet INA3221 26V, Triple Channel, 13-Bit, I2C Output Current and Voltage Monitor With Alerts datasheet (Rev. C) PDF | HTML Sep 10, 2025
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
Application brief Current Sensing Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML Aug 8, 2023
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML Sep 30, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML Sep 2, 2021
Application brief Energy and Power Monitoring with Digital Current Sensors May 25, 2017
Application note Understanding the I2C Bus PDF | HTML Jun 30, 2015

Design & development

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

Evaluation board

INA3221EVM — INA3221 Evaluation Module

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

User guide: PDF
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Code example or demo

SBOC424 — INA3221EVM Source Code

Supported products & hardware
Driver or library

INA3221SW-LINUX — Linux Driver for INA3221

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 git.ti.com: N/A

Supported Devices:
  • ina3221
(...)
Supported products & hardware
GUI for evaluation module (EVM)

SBOC425 — INA3221EVM User Software

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Simulation model

INA3221 IBIS Model

SBOM761.ZIP (56 KB) - IBIS model
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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 (...)

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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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Calculation tool

SBOR021 — Power Monitor Tool

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Reference design

TIDA-050034 — Integrated power supply reference design for NXP i.MX 7D processor

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 (...)

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Reference design

TIDA-050038 — Integrated power supply reference design for NXP i.MX 8M mini processor

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 + (...)

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Reference design

TIDA-050043 — Integrated power supply reference design for NXP i.MX 6ULL processor

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, (...)

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Package Pins CAD symbols, footprints & 3D models
VQFN (RGV) 16 Ultra Librarian
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