Adafruit
Adafruit INA3221 - Triple 0-26 VDC, ±3.2 Amp Power Monitor
· MPN: ADA6062
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The Adafruit INA3221 breakout monitors current, voltage, and power on up to three independent power rails simultaneously over I2C. Each channel supports high...
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The Adafruit INA3221 breakout monitors current, voltage, and power on up to three independent power rails simultaneously over I2C. Each channel supports high or low-side measurement up to +26V DC at ±3.2A with ±1% precision — replacing the need for up to six multimeters in a multi-rail system.
With built-in 0.05Ω 1% sense resistors, a 13-bit ADC, and configurable over-current alert pins, this breakout is ready to go out of the box. Pre-attached 3.5 mm terminal blocks and STEMMA QT / Qwiic connectors mean you can wire up without soldering.
Key Features
- 3 Independent Channels – Monitor three power rails simultaneously from a single chip
- Up to +26V DC, ±3.2A Per Channel – High or low-side measurement with ±1% precision
- 13-bit ADC – 0.4 mA current resolution at ±3.2A range
- Built-in 0.05Ω Sense Resistors – 1% precision shunt on each channel, no external components needed
- Over-Current Alerts – Warning and critical IRQ pins for configurable current thresholds
- STEMMA QT / Qwiic Connectors – Solderless I2C connection with daisy-chain support
- Pre-Attached Terminal Blocks – 3.5 mm screw terminals for quick power rail hookup
- 3.3V & 5V Compatible – Works with Arduino, CircuitPython, Raspberry Pi, and more
- Customisable Range – Replace sense resistors to change current range (e.g., 0.01Ω for up to ±16.4A at 2 mA resolution)
Ideal For
- Multi-rail power supply monitoring and validation
- Battery and solar panel system profiling
- Embedded power consumption analysis across multiple subsystems
- Over-current detection with configurable alert thresholds
Package Contents
- 1× Adafruit INA3221 Triple Power Monitor Breakout (assembled)
- 3× 3.5 mm Terminal Blocks (pre-attached)
- 1× 0.1" Header Strip
Warning: Not for use with AC voltages. DC only, up to +26V per channel.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IRQ
- Short for interrupt request, a signal pin a device uses to get a microcontroller’s attention when something needs handling. It matters here because I2C communication with the sensor requires connecting the IRQ pin to a suitable input pin.
- low-side measurement
- Measuring current on the ground side of a load, after the power has passed through the device being measured. It can be simpler to wire, but it slightly lifts the load’s ground voltage, which may matter in sensitive circuits.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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