component

INA3221

Public Made by Adom

by adom

TI 3-channel I2C current and bus-voltage monitor, VQFN-16. 0-26 V, warning + critical alerts. Datasheet-verified.

componentsensorcurrent-sensepower-monitori2cvqfn-16texas-instruments
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Contents

README

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INA3221

Texas Instruments · Current / power monitor · VQFN-16

Monitors current and bus voltage on three separate rails over I2C, each through its own external shunt, so one chip watches a whole supply tree. It reports shunt and bus voltage per channel from 0 to 26 V, and two open-drain alerts (warning and critical) trip against per-channel limits without host polling. Address pins allow several devices on one bus. A three-rail extension of the INA219 idea for multi-supply boards.

Pinout

Pin Name Type Function
1 IN-3 input Analog input. Connect to load side of the channel 3 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V.
2 IN+3 input Analog input. Connect to supply side of the channel 3 shunt resistor. Common-mode range 0V to 26V.
3 GND power_in Analog ground reference for the device.
4 VS power_in Power supply, 2.7V to 5.5V. Bypass to GND with a 0.1µF ceramic capacitor.
5 A0 input Digital input. I2C/SMBus address select pin. Connect to GND, SCL, SDA, or VS to select one of four programmable device addresses (see Table 7-1).
6 SCL input I2C/SMBus serial clock line. Open-drain input; requires an external pull-up resistor (typ 10kΩ).
7 SDA bidirectional I2C/SMBus serial data line. Open-drain input/output; requires an external pull-up resistor (typ 10kΩ).
8 Warning output Averaged measurement warning alert. Open-drain digital output; requires an external pull-up resistor to VPU.
9 Critical output Conversion-triggered critical alert. Open-drain digital output; requires an external pull-up resistor to VPU.
10 PV output Power valid alert. Open-drain digital output; requires an external pull-up resistor to VPU.
11 IN-1 input Analog input. Connect to load side of the channel 1 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V.
12 IN+1 input Analog input. Connect to supply side of the channel 1 shunt resistor. Common-mode range 0V to 26V.
13 TC output Timing control alert. Open-drain digital output; abs-max 26V.
14 IN-2 input Analog input. Connect to load side of the channel 2 shunt resistor. Bus voltage is the measurement from this pin to ground. Common-mode range 0V to 26V.
15 IN+2 input Analog input. Connect to supply side of the channel 2 shunt resistor. Common-mode range 0V to 26V.
16 VPU power_in Pull-up supply voltage used to bias the power valid (PV) output circuitry and typically the alert open-drain pull-ups.
17 Thermal Pad passive Exposed thermal pad on package bottom. Must be connected to ground or left floating.

Key specifications

Parameter Value
Type 3-channel current / bus-voltage monitor
Channels 3 (external shunts)
Bus voltage 0-26 V
Interface I2C / SMBus
Alerts Warning + critical (open-drain)
Supply 2.7-5.5 V
Package VQFN-16

Ordering variants

Same part, different packaging or reel option.

  • INA3221AIRGVR (VQFN-16)
  • INA3221AIRGVT (VQFN-16, small reel)

CAD (KiCad official)

  • Symbol: Power_Management:INA3221 (KiCad official)
  • Footprint: Package_DFN_QFN:Texas_RGV0016A_VQFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm
  • 3D model: VQFN-16 (KiCad packages3D, STEP)
  • 3D model files: ina3221-etched.step / ina3221-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ina3221.step / ina3221.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (50 pp, sha256 01dd1c52a7675638, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF