INA149AIDR

Overview

The INA149AIDR is a high common-mode voltage differential amplifier manufactured by Texas Instruments. It features a single channel with a gain bandwidth product of 500 kHz and a slew rate of 5 V/us. The device operates on a supply voltage ranging from 4 V to 36 V, consuming 810 uA of quiescent current. Key electrical specifications include a common-mode rejection ratio (CMRR) of 90 dB, an input offset voltage (Vos) of 350 uV, and an output current capability of 25 mA per channel. It provides a 3dB bandwidth of 500 kHz and maintains a gain error of 0.005% at unity gain. The component functions within a temperature range of -40°C to +125°C and is housed in an SOIC-8 surface-mount package.

Feature Summary

• Provides precise measurement of small differential voltages even when large common-mode signals are present.
• Integrates a high-precision operational amplifier with an integrated thin-film resistor network for accuracy.
• Includes protection against instantaneous common-mode transients and differential overloads up to specified limits.

Applications

• High common-mode voltage signal conditioning
• Precision differential amplification in industrial environments
• Current sensing applications requiring high common-mode rejection

Procurement Notes

Verify the specific suffix 'A' indicates the graded performance variant and 'IDR' confirms the SOIC-8 tape-and-reel packaging configuration. Confirm RoHS compliance status through the official manufacturer datasheet or certified distributor documentation prior to integration. Ensure the selected grade matches the required offset voltage and gain error tolerances for the target application design.

Selection Notes

Select this component when the application requires handling high common-mode voltages while maintaining low noise and high precision. The fixed unity gain configuration simplifies circuit design compared to programmable gain alternatives. Consider the 350 uV input offset voltage and 90 dB CMRR as critical parameters for signal integrity in noisy environments where traditional isolation amplifiers may lack sufficient bandwidth or accuracy.

Part Context

This part belongs to the INA149 series of high common-mode voltage differential amplifiers. It is designed to replace traditional isolation amplifiers in applications requiring wide bandwidth and high precision. The device integrates monolithic thin-film resistors to ensure stable gain characteristics without external components, distinguishing it from discrete differential amplifier solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.