# Adafruit INA23x DC Current Voltage Power Monitor
## Overview
Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237.
The INA23x is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and more!
**The INA237 and INA238 are similar to the INA228, with the same:**
- up to +85V high or low-side measurements
- up to 10A or 2.75A
- current, voltage and power measurements
**However, unlike the INA228 the INA237 and INA238:**
- has only 16-bit resolution, so 0.15mA or 42uA LSB rather than 10uA/2.5uA
- the INA228 can measure energy/charge for you but the INA23x cannot
- The INA237 has 0.3% gain error, ±50 µV max offset voltage compared to INA228's 0.05% gain error, ±1 µV
- The INA238 has 0.1% gain error, ±5 µV max offset voltage compared to INA228's 0.05% gain error, ±1 µV
The **INA237** and **INA238** are completely code-equivalent, the **INA238** has better gain error and offset voltage than the **INA237** , at a slightly higher price.
This breakout board may well be the last current sensing solution you every need to buy. Not only can it do the work of two multimeters, but it can do it with amazing precision and flexibility. With it you can measure high or low side DC current, the bus voltage, and have it automatically calculate the power. It can do so over impressive voltage, current, and temperature ranges with better than 1% accuracy, all while delivering the data in an easy to use format over I2C.
Works great with any microcontroller that is CircuitPython or Arduino compatible as well as single board computers such as the Raspberry Pi. It is compatible with 3V or 5V logic and can measure bus voltages up to +85VDC. **Not for use with AC voltages.**
Most current-measuring devices operate with some notable constraints that limit what they can be used for. Many are low-side only which can cause issues as the ground reference changes with current. Others like its little sister the INA219B avoid this by measuring on the high side but need to change their shunt resistor to measure different current ranges. The INA23x avoids these limitations, and with the precision 15milliohm shunt resistor on board, it can be used to measure as much as **+85V** at up to **10A ** (~0.15mA per LSB) or ** 2.75A** (~42uA per LSB) **Continuous** on either the _high or low side_. Wow!
The voltage across the integrated _15 milliohm (.015 ohms!)_, 0.1% shunt resistor is measured by the internal 16 bit ADC, allowing for measurements over the current range with a resolution of 0.15mA per LSB in high current measurement mode or 42uA per LSB in low current measurement mode. To measure low-side, Connect **VIN-** to ground and **VIN+** to your load's lowest potential. Cut the jumper on the back that connects VBUS to VIN+: **VBUS** should connect to the highest project voltage, up to 85V. To measure high-side, connect **VIN+** to the highest project voltage, and **VIN-** to the load's highest potential. In high-side measurement, which is most common, we simplify wiring by having a pre-connected jumper from **V+** to **VBUS**.
Usage is simple. Power the sensor itself with 3 to 5VDC and connect the two I2C pins to your microcontroller. Then connect your target power supply to VIN+ and the load to ground to VIN-. We have a detailed tutorial that will do all the gain, range, and math for you - just plug and go with [our Arduino library](https://github.com/adafruit/Adafruit_INA237_INA238)or CircuitPython! You can connect up to 4 sensors on one bus by soldering the address jumpers on the back.
As if that weren't enough, we also added[SparkFun qwiic](https://www.sparkfun.com/qwiic)-compatible **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt)** connectors for the I2C bus, **so you don't even need to solder the I2C and power lines.** Simply wire up to your favorite micro using a [STEMMA QT adapter cable.](https://www.adafruit.com/?q=stemma%20qt%20cable) The Stemma QT connectors also mean the INA237 can be used with our [various associated accessories.](https://www.adafruit.com/?q=JST%20SH%204) [QT Cable is not included, but we have a variety in the shop](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch).
Comes as a fully assembled breakout board with a 3.5mm terminal block and header. Some light soldering is required to attach the header for use in a breadboard.
- [Next Page](https://learn.adafruit.com/adafruit-ina237-dc-current-voltage-power-monitor/pinouts.md)
## Primary Products
### Adafruit INA237 85V 10A 16-bit DC Current Voltage Power Monitor
[Adafruit INA237 85V 10A 16-bit DC Current Voltage Power Monitor](https://www.adafruit.com/product/6340)
The INA237 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and...
In Stock
[Buy Now](https://www.adafruit.com/product/6340)
[Related Guides to the Product](https://learn.adafruit.com/products/6340/guides)
### Adafruit INA238 DC Current Voltage Power Monitor
[Adafruit INA238 DC Current Voltage Power Monitor](https://www.adafruit.com/product/6349)
The INA238 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and...
In Stock
[Buy Now](https://www.adafruit.com/product/6349)
[Related Guides to the Product](https://learn.adafruit.com/products/6349/guides)
## Featured Products
### STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long
[STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long](https://www.adafruit.com/product/4210)
This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
In Stock
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[Related Guides to the Product](https://learn.adafruit.com/products/4210/guides)
### STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long
[STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long](https://www.adafruit.com/product/4399)
This 4-wire cable is 50mm / 1.9" long and fitted with JST SH female 4-pin connectors on both ends. Compared with the chunkier JST PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
In Stock
[Buy Now](https://www.adafruit.com/product/4399)
[Related Guides to the Product](https://learn.adafruit.com/products/4399/guides)
### STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets
[STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets](https://www.adafruit.com/product/4397)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium female headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and...
In Stock
[Buy Now](https://www.adafruit.com/product/4397)
[Related Guides to the Product](https://learn.adafruit.com/products/4397/guides)
### STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable
[STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable](https://www.adafruit.com/product/4209)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium Dupont male headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert...
In Stock
[Buy Now](https://www.adafruit.com/product/4209)
[Related Guides to the Product](https://learn.adafruit.com/products/4209/guides)
### JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic
[JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic](https://www.adafruit.com/product/4398)
This cable will make it super easy to use our plug-and-play STEMMA QT boards with boards like Circuit Playground. On one end you get a Qwiic / STEMMA QT connector (technically known as a JST SH 4-pin plug) into 4 individual wires with grippy alligator clips. We're carrying these to...
Out of Stock
[Buy Now](https://www.adafruit.com/product/4398)
[Related Guides to the Product](https://learn.adafruit.com/products/4398/guides)
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