INA139NA/3K

Current Regulation/Management Overview

The INA139NA/3K is a high-side current monitor integrated circuit manufactured by Texas Instruments. It operates within an input voltage range of 2.7V to 40V and supports a supply voltage range of 2.7V to 40V. The device features a typical quiescent current of 60µA and offers an accuracy of ±0.5%. It utilizes a single resistor for gain setting and provides a current output proportional to the differential input voltage. The component is housed in a 5-pin SOT-23 package and is rated for operation between -40°C and +125°C.

Current Regulation/Management Feature Summary

• Enables complete single-supply high-side current measurement with independent power and input common-mode voltage ranges.
• Converts differential input voltage into a proportional current output using a single external resistor for gain setting.
• Features low static current consumption, allowing connection to either side of the current sensing shunt with minimal error.

Current Regulation/Management Applications

• Shunt measurements in automotive systems
• Portable and backup battery system monitoring
• Precision current source regulation

Current Regulation/Management Procurement Notes

Verify that the specific suffix '3K' corresponds to the tape-and-reel packaging configuration as indicated by distributor listings. Confirm the manufacturer part number matches the official datasheet documentation for the INA139 series to ensure correct pinout and electrical characteristics. Check RoHS compliance status against current regulatory requirements before finalizing procurement orders.

Current Regulation/Management Selection Notes

Select this component when high-side current monitoring is required with a wide common-mode voltage range up to 40V. The low quiescent current makes it suitable for battery-powered applications. Ensure the external load resistor can handle the output current generated by the monitored shunt voltage. Consider the SOT-23-5 package size constraints for PCB layout design.

Current Regulation/Management Part Context

The INA139NA/3K belongs to the INA139/INA169 family of current shunt monitors from Texas Instruments. These devices are designed for versatile current sensing applications where the shunt resistor is placed on the high side of the load. The family shares similar functional architectures but may differ in maximum voltage ratings and specific performance metrics.

Current Regulation/Management Replacement Considerations

The INA138NA/3K is a related high-side current monitor within the same product family. Verify compatibility regarding voltage ranges and accuracy specifications before substitution. Ensure the replacement part maintains the required SOT-23-5 footprint and pin configuration for direct board integration.