INA139NA/3KG4

Current Regulation/Management Overview

The INA139NA/3KG4 is a high-side current shunt monitor manufactured by Texas Instruments, housed in a compact SOT-23-5 surface-mount package. It operates on a single supply voltage ranging from 2.7 V to 40 V and supports typical system voltages of 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, and 28 V. The device features a minimum common-mode rejection ratio (CMRR) of 100 dB and maintains an accuracy of ±0.5%. It functions within a temperature range of -40 °C to +85 °C or +125 °C depending on the specific variant configuration.

Current Regulation/Management Feature Summary

• Provides high-side current monitoring with independent input common-mode and power supply voltage ranges
• Converts differential input voltage into a proportional output current for flexible gain setting via external load resistor
• Delivers high common-mode rejection ratio to ensure accurate measurements in noisy environments

Current Regulation/Management Applications

• Current sensing in battery-powered systems
• Motor control circuitry
• Power supply monitoring
• Industrial process control instrumentation

Current Regulation/Management Procurement Notes

Verify the exact suffix designation against the manufacturer's official datasheet to confirm temperature grade and packaging specifications. Ensure compatibility with the target application's voltage requirements and thermal management constraints before finalizing procurement decisions.

Current Regulation/Management Selection Notes

Select this component when high-side current measurement is required with minimal static current consumption. Consider the SOT-23-5 footprint for space-constrained designs. Verify that the external load resistor selection aligns with the desired output voltage swing and power dissipation limits for the specific operating conditions.

Current Regulation/Management Part Context

This part belongs to the INA139 family of current shunt monitors. It shares functional similarities with the INA138 but offers specific performance characteristics tailored for general-purpose current sensing applications. The device is designed to interface directly with shunt resistors to provide a precise representation of load current.

Current Regulation/Management Replacement Considerations

INA139NA/250G4 is a documented substitute within the same product family offering identical core functionality and pinout compatibility.