INA238AIDGST

Power Supply Controllers, Monitors Overview

The INA238AIDGST is a high-precision power monitor manufactured by Texas Instruments, designed for accurate measurement of current, voltage, and power in systems with common-mode voltages up to 85 V. It features a 16-bit analog-to-digital converter and an I2C interface for digital communication. The device operates within a supply voltage range of 2.7 V to 5.5 V and supports a wide operating temperature range from -40°C to +125°C. Packaged in a 10-VSSOP format, it integrates precision amplifiers and reference circuitry to deliver high accuracy without external calibration.

Power Supply Controllers, Monitors Feature Summary

• Integrates a 16-bit ADC for high-resolution measurement of bus voltage, shunt voltage, and calculated power
• Supports I2C digital interface for direct connection to microcontrollers and data acquisition systems
• Enables high-side or low-side current sensing with common-mode voltage capability up to 85 V
• Includes programmable averaging and alert functionality for system monitoring and protection

Power Supply Controllers, Monitors Applications

• Industrial process control and automation systems requiring precise power monitoring
• Battery management systems in electric vehicles and energy storage applications
• Data center server power distribution units and load monitoring
• Medical equipment power supplies requiring high accuracy and isolation

Power Supply Controllers, Monitors Procurement Notes

Verify the exact suffix against the manufacturer's official datasheet to confirm package type and temperature grade. Ensure the ordering part number matches the specific variant required for your design, as suffixes may indicate differences in tape-and-reel specifications or regional compliance. Cross-reference the component marking code with the latest production data to avoid counterfeit parts. Confirm availability through authorized distributors only.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing circuits that require simultaneous measurement of voltage, current, and power with high precision. The 85-V common-mode range makes it suitable for high-voltage industrial applications where standard op-amps cannot operate safely. Consider the I2C interface requirements and ensure the host controller supports the necessary clock speeds. Evaluate the need for internal averaging versus external filtering based on noise immunity requirements.

Power Supply Controllers, Monitors Part Context

The INA238 belongs to Texas Instruments' family of high-precision power monitors, which also includes the INA236, INA237, and INA239. These devices are designed to simplify power management by integrating multiple measurement functions into a single small-footprint package. The INA238 specifically targets applications requiring higher precision than the INA237 while offering an I2C interface unlike the SPI-based INA239.

Power Supply Controllers, Monitors Replacement Considerations

• INA237AIDGST
• INA236AIDGSR

Power Supply Controllers, Monitors FAQ

What is the maximum common-mode voltage supported by the INA238?

The INA238 supports a common-mode voltage range from -0.3 V to 85 V, allowing for both high-side and low-side current sensing.

Does the INA238 require external calibration?

No, the INA238 is factory-calibrated and does not require external calibration for typical applications, ensuring high accuracy out of the box.

What digital interface does the INA238 use for communication?

The INA238 uses a two-wire I2C interface for communication with the host microcontroller or processor.