Adafruit INA238 DC Current Voltage Power Monitor
The Adafruit INA238 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 microamps 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 0.1% gain error and ±5 µV max offset
- 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
INA238 vs INA237 vs INA228
- INA238: 16-bit, 0.1% gain error, ±5 µV max offset — code-compatible with INA237 at higher precision
- INA237: 16-bit, 0.3% gain error, ±50 µV max offset — lower cost alternative
- INA228: 20-bit (10 µA / 2.5 µA LSB), 0.05% gain error, ±1 µV offset, plus 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 INA238 Power Monitor Breakout (assembled)
- 1× 3.5 mm Terminal Block
- 1× Header Strip
Resources
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Adafruit INA238 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 microamps 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 0.1% gain error and ±5 µV max offset
- 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
INA238 vs INA237 vs INA228
- INA238: 16-bit, 0.1% gain error, ±5 µV max offset — code-compatible with INA237 at higher precision
- INA237: 16-bit, 0.3% gain error, ±50 µV max offset — lower cost alternative
- INA228: 20-bit (10 µA / 2.5 µA LSB), 0.05% gain error, ±1 µV offset, plus 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 INA238 Power Monitor Breakout (assembled)
- 1× 3.5 mm Terminal Block
- 1× Header Strip
