INA138NA/3K

Current Regulation/Management Overview

The INA138NA/3K is a high-side, single current shunt monitor manufactured by Texas Instruments. It operates with an input common-mode voltage range of 2.7 V to 36 V and a supply voltage range of 2.7 V to 36 V. The device provides a current output proportional to the differential input voltage across a shunt resistor. It features a typical accuracy of ±0.5% and a low quiescent current of 25 µA. The component is housed in a 5-pin SOT-23 package (SC-74A/SOT-753) and is rated for an operating temperature range from -40°C to +125°C.

Current Regulation/Management Feature Summary

• Provides current output proportional to the differential input voltage across a shunt resistor
• Supports high-side measurement with independent input common-mode and supply voltages
• Maintains high accuracy with minimal error over the specified temperature range

Current Regulation/Management Applications

• High-side current monitoring in power distribution systems
• Battery management and protection circuits
• Industrial process control current sensing

Current Regulation/Management Procurement Notes

Verify the specific suffix '3K' corresponds to the tape-and-reel packaging configuration required for your assembly line. Confirm that the SC-74A or SOT-753 footprint matches your PCB design guidelines. Ensure the component meets RoHS and REACH compliance standards for your target market regulations before finalizing procurement orders.

Current Regulation/Management Selection Notes

Select this component when high-side current sensing is required within a 36 V common-mode range. The low 25 µA quiescent current makes it suitable for battery-powered applications. Verify that the external load resistor can handle the maximum output current without exceeding power dissipation limits. Consider the ±0.5% accuracy specification against your system's tolerance requirements.

Current Regulation/Management Part Context

This part belongs to the INA138 family of current shunt monitors. It shares functional similarities with the INA139 but differs in specific electrical characteristics and pinout configurations. The '/3K' suffix indicates a specific reel quantity packaging variant compared to bulk or cut-tape options like '/250'.

Current Regulation/Management Replacement Considerations

The INA138NA/250G4 is listed as a discontinued alternative. Check for direct replacements such as the INA138NA/250 if availability is critical. Verify pin compatibility and electrical parameter alignment before substituting.