INA2181A4QDGSRQ1

Overview

The INA2181A4QDGSRQ1 is a dual-channel, bidirectional current sense amplifier from Texas Instruments, designed for automotive applications under AEC-Q100 qualification. It operates with a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages up to 12 V. The device features a fixed gain of 200 V/V, a gain error of 0.1%, and an input bias current of 75 uA. It offers a bandwidth product of 105 kHz and low input offset voltage of 100 uV. Operating temperatures span from -40°C to +125°C, housed in a compact MSOP-10 package.

Feature Summary

• Dual-channel architecture enabling simultaneous monitoring of two independent current paths within a single integrated circuit.
• Bidirectional sensing capability allowing accurate measurement of current flow in both directions relative to ground.
• High precision performance characterized by low gain error and minimal input offset voltage for reliable data acquisition.
• Automotive-grade reliability ensured through AEC-Q100 certification for operation in harsh environmental conditions.

Applications

• Automotive battery management systems requiring precise current monitoring
• Electric power steering circuits for torque and position feedback
• Body control modules managing multiple electrical loads
• Charging system diagnostics and protection

Procurement Notes

Verify the specific suffix QDGSRQ1 matches the required automotive grade and tape-and-reel packaging configuration. Confirm that the MSOP-10 footprint aligns with the target PCB layout constraints. Ensure the design accounts for the specified thermal dissipation limits within the operating temperature range of -40°C to +125°C. Cross-reference the datasheet revision to guarantee compatibility with existing simulation models and application notes.

Selection Notes

Select this component when dual-channel isolation is necessary within a constrained space. The 200 V/V gain suits applications with small voltage drops across shunt resistors. Consider the 12 V common-mode limit when designing high-side or low-side configurations. The low quiescent current contributes to energy efficiency in battery-powered automotive subsystems compared to higher-power alternatives.

Part Context

This part belongs to the INA2181 family of current sense amplifiers, which are optimized for automotive environments. The series provides robust protection against transient voltages and noise. The dual-channel variant integrates two identical amplifier channels, reducing board space and component count compared to using discrete single-channel solutions in complex vehicle electronics architectures.

Replacement Considerations

Check for direct pin-compatible substitutes within the INA2181 family with different gain options. Verify if older revisions of the INA2181 offer equivalent electrical characteristics without the automotive qualification suffix if cost reduction is prioritized over certified reliability.