INA2181A1IDSQR

Overview

The INA2181A1IDSQR is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 20 V/V and a bandwidth of 350 kHz. The device operates with a supply voltage between 2.7 V and 5.5 V and supports common-mode voltages from -0.2 V to +26 V. It draws a maximum quiescent current of 500 µA and includes an integrated matched resistor network for high accuracy.

Feature Summary

• Bidirectional sensing capability allows monitoring of current flow in both directions by offsetting the output voltage via the REF pin.
• Integrated matched resistor gain network minimizes gain error and reduces temperature drift for stable performance.
• Wide common-mode input range enables operation independent of the power-supply voltage for both high-side and low-side configurations.

Applications

• Motor control
• Battery monitors and balancers
• Power management
• Lighting control
• Solar inverters

Procurement Notes

Verify the specific package suffix 'SQR' against the manufacturer's official documentation to confirm the exact physical dimensions and tape-and-reel specifications. Ensure the ordering part number matches the required channel count and gain option before procurement.

Selection Notes

Select this component when dual-channel current monitoring is required within a single package footprint. The A1 designation indicates a fixed 20 V/V gain, suitable for applications requiring moderate amplification. Verify that the 350 kHz bandwidth meets the system's dynamic response requirements.

Part Context

This device belongs to the INAx181 family of cost-optimized current-sense amplifiers. The family includes single-channel (INA181), dual-channel (INA2181), and quad-channel (INA4181) variants. All devices share similar electrical characteristics but differ in channel count and package options.

Replacement Considerations

Other members of the INAx181 family, such as the INA2181A2 or INA2181A3, offer different fixed gains (50 V/V or 100 V/V). Single-channel alternatives like the INA181A1 provide identical electrical performance in a smaller package if only one channel is needed.