INA138NA/250G4

Current Regulation/Management Overview

The INA138NA/250G4 is a high-side current shunt monitor manufactured by Texas Instruments. It operates on a single supply voltage ranging from 2.7 V to 36 V, with typical applications utilizing 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, and 28 V rails. The device provides an output current proportional to the input voltage across a shunt resistor. It features a minimum common-mode rejection ratio of 100 dB and maintains an accuracy of ±0.5%. The component is housed in a compact SOT-23 (SC-74A/SOT-753) package with five pins, measuring 2.9 mm in length, 1.6 mm in width, and 1.15 mm in height. It supports surface-mount installation and functions within a temperature range of -40 °C to +125 °C.

Current Regulation/Management Feature Summary

• Provides high-side current monitoring capability for power management systems
• Delivers an output current directly proportional to the sensed shunt voltage
• Ensures signal integrity through high common-mode rejection performance

Current Regulation/Management Applications

• Industrial process control current sensing
• Power supply overcurrent protection circuits
• Battery management system monitoring

Current Regulation/Management Procurement Notes

Verify component authenticity due to discontinued status. Confirm RoHS3 compliance and moisture sensitivity level 2 classification. Check for valid manufacturer recommended substitutes such as INA138NA/250. Ensure packaging type matches design requirements, noting availability in tape and reel or cut tape formats from authorized distributors.

Current Regulation/Management Selection Notes

Select this component for applications requiring precise high-side current measurement in space-constrained designs. The SOT-23-5 package offers a small footprint suitable for dense PCB layouts. Consider the wide common-mode voltage range up to 36 V when interfacing with various power rails. Evaluate thermal performance against the specified operating temperature limits for the intended environment.

Current Regulation/Management Part Context

This part belongs to the INA138 series of current monitors, designed for high-side sensing applications. It shares functional similarities with the INA168 but differs in maximum input voltage specifications. The device is part of Texas Instruments' portfolio of power management integrated circuits, specifically categorized under current regulation and monitoring solutions for industrial and commercial electronics.

Current Regulation/Management Replacement Considerations

The INA138NA/250 is listed as a manufacturer-recommended alternative. Verify pin compatibility and electrical parameter alignment before substitution. Note that the original part number indicates discontinued status.