The Adafruit INA237 is a precision DC power monitor capable of measuring current, voltage, and power on either the high or low side of your circuit. With support for up to +85V DC common-mode voltage and a 16-bit ADC, it delivers accurate measurements from milliamps to 10A — all over a simple I2C interface.

Featuring an integrated 15 mΩ (0.015Ω) 0.1% shunt resistor, configurable gain, oversampling, and alert thresholds, this breakout replaces two multimeters with a single chip. It works with 3.3V or 5V logic and includes STEMMA QT / Qwiic connectors for solderless I2C wiring.

Key Features

• Up to +85V DC – High or low-side current measurement with wide common-mode voltage range
• Two Current Ranges – Up to 10A (~0.15 mA/LSB) or 2.75A (~42 µA/LSB) continuous
• 16-bit ADC – Precision current, voltage, and automatic power calculation
• 15 mΩ Integrated Shunt – 0.1% precision shunt resistor with 0.3% gain error
• I2C Interface – Configurable alerts, oversampling, and gain; up to 4 sensors per bus
• STEMMA QT / Qwiic Connectors – Solderless I2C connection with daisy-chain support
• 3.3V & 5V Compatible – Works with Arduino, CircuitPython, Raspberry Pi, and more
• High or Low-Side Wiring – Jumper on back allows configuration for either measurement topology

INA237 vs INA228

• Same: Up to +85V, up to 10A or 2.75A, current/voltage/power measurements
• INA237: 16-bit resolution (0.15 mA or 42 µA LSB), 0.3% gain error, ±50 µV max offset
• INA228: 20-bit resolution (10 µA or 2.5 µA LSB), 0.05% gain error, ±1 µV offset, energy/charge measurement

Ideal For

• Battery and solar panel power monitoring
• High-voltage DC system current profiling (up to 85V)
• Embedded power consumption analysis and optimisation
• Projects requiring both high-side voltage and current measurement

Package Contents

• 1× Adafruit INA237 Power Monitor Breakout (assembled)
• 1× 3.5 mm Terminal Block
• 1× Header Strip

Resources

• Adafruit INA237 Guide
• Arduino INA237/INA238 Library (GitHub)
• STEMMA QT Overview