INA128UA/2K5

Overview

The INA128UA/2K5 is a precision, low-power instrumentation amplifier manufactured by Texas Instruments. It features a single channel housed in an 8-SOIC surface-mount package. The device operates within a supply voltage range of 4.5 V to 36 V and supports dual supplies from ±2.25 V to ±18 V. Key electrical specifications include a maximum input offset voltage of 25 µV, an input bias current of 5 nA, and a gain-bandwidth product of 1.3 MHz. It functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• High common-mode rejection ratio for accurate signal conditioning
• Low power consumption suitable for battery-operated applications
• Precision performance with minimal input offset voltage

Applications

• Medical electrocardiogram (ECG) signal processing
• Strain gauge and bridge sensor interfaces
• Photodiode transimpedance amplification
• Industrial process control systems
• Data acquisition front-end circuits

Procurement Notes

Verify the specific suffix /2K5 indicates tape-and-reel packaging when ordering. Confirm that the UA variant meets the required extended temperature range specifications for your application environment. Ensure compatibility with existing PCB footprints for the 8-SOIC package during procurement planning.

Selection Notes

Select this component when high precision and low power are critical requirements. Compare against the INA128U if tube packaging is preferred over reel packaging. Consider the INA128UA if the wider industrial temperature range up to 125°C is necessary compared to standard commercial grades.

Part Context

This part belongs to the INA12x family of instrumentation amplifiers from Texas Instruments. It shares architectural similarities with the INA128 but differs in packaging and temperature rating. The /2K5 designation specifically denotes the reel quantity and packaging format used for automated assembly processes.

Replacement Considerations

Official substitutes within the same family include the INA128U for tube-packaged versions. Verify thermal performance and pinout compatibility before substituting with other instrumentation amplifiers from different manufacturers.