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INA3221-Q1

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AEC-Q100, 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts

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Data sheet

INA3221-Q1

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 TI functional safety category Functional Safety-Capable Rating Automotive 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 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 125
VQFN (RGV) 16 16 mm² (4 mm × 4 mm)
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40 °C to 125 °C
  • Functional Safety-Capable
  • Senses bus voltages from 0 V to 26 V
  • Reports shunt and bus voltage
  • High accuracy:
    • Offset voltage: ±80 µV (maximum)
    • Gain error: 0.25% (maximum)
  • Configurable averaging options
  • Four programmable addresses
  • Programmable alert and warning outputs
  • Power-supply operation: 2.7 V to 5.5 V
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40 °C to 125 °C
  • Functional Safety-Capable
  • Senses bus voltages from 0 V to 26 V
  • Reports shunt and bus voltage
  • High accuracy:
    • Offset voltage: ±80 µV (maximum)
    • Gain error: 0.25% (maximum)
  • Configurable averaging options
  • Four programmable addresses
  • Programmable alert and warning outputs
  • Power-supply operation: 2.7 V to 5.5 V

The INA3221-Q1 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221-Q1 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221-Q1 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221-Q1 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-Q1 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-Q1 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface. The INA3221-Q1 monitors both shunt voltage drops and bus supply voltages, in addition to having programmable conversion times and averaging modes for these signals. The INA3221-Q1 offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

The INA3221-Q1 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-Q1 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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* Data sheet INA3221-Q1AEC-Q100, 26-V, Triple Channel, 13-Bit, I2C Output Current and Voltage Monitor With Alerts datasheet (Rev. C) PDF | HTML Mar 23, 2021
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 note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML Sep 30, 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML Sep 2, 2021
Functional safety information INA3221-Q1 Functional Safety FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML May 20, 2020
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

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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
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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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VQFN (RGV) 16 Ultra Librarian
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