INA2126U/2K5

Overview

The INA2126U/2K5 is a dual-channel micropower instrumentation amplifier manufactured by Texas Instruments. It features two independent channels in a 16-pin SOIC package, designed for accurate differential signal acquisition with low noise and quiescent current of 175 µA per channel. The device operates on a wide supply range from ±1.35 V to ±18 V (2.7 V to 36 V total). Key electrical specifications include a maximum input offset voltage of 500 µV, a gain bandwidth product of 200 kHz at G=5, and a common-mode rejection ratio of 83 dB. Gain is programmable from 5 V/V to 10,000 V/V using a single external resistor.

Feature Summary

• Dual-channel architecture providing two independent precision instrumentation amplifiers within a single package.
• Micropower design delivering low quiescent current consumption suitable for battery-operated systems.
• Wide operating supply voltage range supporting both single and dual power configurations.
• Laser-trimmed internal circuitry ensuring low offset voltage and high common-mode rejection.

Applications

• Industrial sensor amplification for bridge circuits, RTDs, and thermocouples
• Physiological signal acquisition including ECG, EEG, and EMG monitoring
• Multi-channel data acquisition systems requiring precise differential measurements

Procurement Notes

Verify the specific ordering suffix /2K5 indicates reel packaging when sourcing components. Confirm that the SOIC-16 package dimensions match the target PCB footprint requirements. Ensure the selected variant meets the required industrial temperature range specifications for the intended application environment.

Selection Notes

Select this component when dual-channel isolation is required without increasing board space significantly. Consider the 16-pin SOIC package for surface-mount assembly needs. Evaluate the 200 kHz bandwidth and 175 µA current consumption against system power and speed constraints to ensure compatibility with the overall design goals.

Part Context

This device belongs to the INA2126 family of micropower instrumentation amplifiers, which are successors to the INA126 series. The family offers single and dual versions to accommodate various channel count requirements. The INA2126U specifically denotes the dual-channel version housed in a standard 16-pin Small Outline Integrated Circuit package, distinct from the DIP or SSOP variants available in the same series.

Replacement Considerations

The INA126U serves as a functional equivalent within the same family, offering identical electrical performance but potentially different historical availability status. Verify pinout compatibility and package dimensions before substituting. Other members of the INA126/INA2126 series may be considered if package form factors differ.