Home Amplifiers Current-sense amplifiers Digital power monitors
Home
Amplifiers
Current-sense amplifiers
Digital power monitors

INA237-Q1

ACTIVE

AEC-Q100, 85-V, 16-bit, I²C output current/voltage/charge monitor

Order now
Data sheet

INA237-Q1

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Digital interface I2C, SMBus Resolution (Bits) 16 Input offset (±) (max) (µV) 50 Input offset drift (±) (max) (µV/°C) 0.02 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 120 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Gain error (%) 0.3 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Digital Temp Monitor, I2C, Integrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 0.6 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.3 Digital interface I2C, SMBus Resolution (Bits) 16 Input offset (±) (max) (µV) 50 Input offset drift (±) (max) (µV/°C) 0.02 Input offset drift (±) (typ) (µV/°C) 0.002 Voltage gain (V/V) 1 CMRR (min) (dB) 120 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1.1 Gain error (%) 0.3 Gain error drift (±) (max) (ppm/°C) 50 Features Alert Function, Bidirectional, Digital Temp Monitor, I2C, Integrated Power Monitor, Low-side Capable Number of channels 1 Power measurement accuracy (%) 0.6 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±50µV (maximum)
    • Offset drift: ±0.02µV/°C (maximum)
    • Gain error: ±0.3% (maximum)
    • Gain error drift: ±50ppm/°C (maximum)
    • Common mode rejection: 120dB (minimum)
  • Power monitoring accuracy:
    • 1.6% full scale, –40°C to +125°C (maximum)
  • Fast alert response: 75µs
  • Wide common-mode range: –0.3V to +85V
  • Bus voltage sense input: 0V to 85V
  • Shunt full-scale differential range: ±163.84mV / ±40.96mV
  • Input bias current: 2.5nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy:
    • Offset voltage: ±50µV (maximum)
    • Offset drift: ±0.02µV/°C (maximum)
    • Gain error: ±0.3% (maximum)
    • Gain error drift: ±50ppm/°C (maximum)
    • Common mode rejection: 120dB (minimum)
  • Power monitoring accuracy:
    • 1.6% full scale, –40°C to +125°C (maximum)
  • Fast alert response: 75µs
  • Wide common-mode range: –0.3V to +85V
  • Bus voltage sense input: 0V to 85V
  • Shunt full-scale differential range: ±163.84mV / ±40.96mV
  • Input bias current: 2.5nA (maximum)
  • Temperature sensor: ±1°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)

The INA237-Q1 is an ultra-precise digital power monitor with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element with common-mode voltage support from –0.3V to +85V.

The INA237-Q1 reports current, bus voltage, temperature, and power, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.

The low offset and gain drift design of the INA237-Q1 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in A to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.

The device allows for selectable ADC conversion times from 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.

The INA237-Q1 is an ultra-precise digital power monitor with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element with common-mode voltage support from –0.3V to +85V.

The INA237-Q1 reports current, bus voltage, temperature, and power, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.

The low offset and gain drift design of the INA237-Q1 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in A to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.

The device allows for selectable ADC conversion times from 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
filter Find other Digital power monitors
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
INA238-Q1 ACTIVE AEC-Q100, 85-V, 16-bit, high-precision, I²C output current/voltage/charge monitor The INA238 has the same functionality with improved performance

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 10
Top documentation Type Title Format options Date
* Data sheet INA237-Q1 AEC-Q100, 85V, 16 -Bit, Precision Power Monitor With I2C Interface datasheet (Rev. B) PDF | HTML 19 Jun 2025
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Application note Digital Interfaces for Current Sensing Devices (Rev. A) PDF | HTML 30 Sep 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Application brief Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) PDF | HTML 28 Sep 2021
Application note Getting Started with Digital Power Monitors (Rev. A) PDF | HTML 02 Sep 2021
Application brief Shunt-Based Current-Sensing Solutions for BMS Applications in HEVs and EVs (Rev. B) PDF | HTML 02 Feb 2021
Functional safety information INA2xx-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 02 Nov 2020
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

INA228_237_238EVM — INA228, INA237 & INA238 evaluation module

This evaluation module (EVM) is an easy-to-use platform to evaluate the main features and performance of the INA228, INA237 or INA238.

The EVM supports current measurements up to 10-A and comes with graphical user interface (GUI) support to read and write to device registers.

User guide: PDF | HTML
View Options
IDE, configuration, compiler or debugger

ASC-STUDIO-INA237 — ASC studio (SysConfig) for configuring all aspects of the INA237 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA237 current sensor.
Supported products & hardware

Supported products & hardware
Launch
Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

Supported products & hardware

Supported products & hardware
Launch Download
Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware

Supported products & hardware
Download
Calculation tool

SBOR021 — Power Monitor Tool

Power Monitor Tool
Supported products & hardware

Supported products & hardware
Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Request
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
View Options
Reference designs

TIDA-020060 — Automotive power over data lines reference design for 100/1000Base-T1 Ethernet applications

This reference design demonstrates an implementation of Power over Data Lines (PoDL) for automotive use cases. The design uses a DP83TG720S-Q1 1000MBit/s single-pair Ethernet (SPE) PHY with the option to switch to the DP83TC812S-Q1 SPE PHY for 100MBit/s operation. A coupling and decoupling network (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGS) 10 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos