INA2181A3IDGSR

Overview

The INA2181A3IDGSR is a dual-channel, bidirectional current sense amplifier from Texas Instruments. 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 and a gain-bandwidth product of 105 kHz. Key electrical specifications include a maximum input offset voltage of 100 µV, a typical input bias current of 75 µA, and a quiescent current of 500 µA per channel. It offers a common-mode rejection ratio (CMRR) of 100 dB and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Dual-channel architecture for simultaneous high-side or low-side current monitoring
• Bidirectional operation supporting both positive and negative current flow detection
• High precision performance with low input offset voltage and high common-mode rejection

Applications

• Industrial process control systems requiring multi-rail current monitoring
• Power distribution units in data centers and telecom infrastructure
• Battery management systems for electric vehicles and portable electronics

Procurement Notes

Verify the specific suffix IDGSR corresponds to the MSOP-10 package and tape-and-reel packaging configuration. Confirm that the A3 grade meets the required offset voltage and gain accuracy specifications for your application. Ensure compatibility with the 12 V common-mode voltage limit when interfacing with higher voltage rails. Check for any recent lifecycle notices regarding obsolescence or alternative recommendations from the manufacturer.

Selection Notes

Select this component when dual-channel monitoring is required within a compact MSOP-10 footprint. It is suitable for applications needing moderate bandwidth (105 kHz) and high accuracy without the complexity of programmable gain. Consider the 500 µA quiescent current per channel against system power budgets. Evaluate the 12 V common-mode limit to ensure it aligns with the bus voltage being monitored.

Part Context

The INA2181 series belongs to Texas Instruments' portfolio of precision current sense amplifiers designed for industrial and automotive applications. This family provides integrated solutions for monitoring multiple power rails efficiently. The INA2181 specifically targets applications requiring dual-channel sensing with high common-mode voltage tolerance and low noise characteristics.

Replacement Considerations

Check for direct pin-compatible replacements within the INA2181 family, such as variants with different gain settings or package options. Verify if newer generations like the INA219x series offer improved specifications or extended availability while maintaining functional compatibility.