INA2181A3IDSQR

Overview

The INA2181A3IDSQR is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 100 V/V and operates with a supply voltage range of 2.7 V to 5.5 V. The device supports a common-mode input voltage range from -0.2 V to +26 V, enabling high-side and low-side sensing. Key electrical specifications include a maximum quiescent current of 500 µA, a bandwidth of 150 kHz, and an output slew rate of 2 V/µs. It is housed in a 10-pin WSON package.

Feature Summary

• Bidirectional current monitoring capability for both positive and negative flow detection
• Integrated matched resistor network providing fixed gain options to minimize error
• Wide common-mode voltage range independent of the power supply voltage
• Rail-to-rail output swing allowing linear operation near ground and supply rails

Applications

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

Procurement Notes

Verify the specific suffix 'SQ' against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure the ordering part number matches the exact pinout and thermal pad requirements for your PCB layout. Confirm availability status as production data may be subject to change or obsolescence notices.

Selection Notes

Select this component when dual-channel bidirectional sensing is required within a single package. The A3 variant provides a fixed 100 V/V gain suitable for moderate shunt voltages. Consider the 150 kHz bandwidth for applications requiring faster response times compared to lower-bandwidth alternatives. Verify that the 26 V common-mode limit accommodates the highest bus voltage in the design.

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 such as SOT-23, VSSOP, and TSSOP.

Replacement Considerations

Direct substitutes within the same family include INA2181A1IDSQR, INA2181A2IDSQR, and INA2181A4IDSQR, which offer different fixed gains of 20 V/V, 50 V/V, and 200 V/V respectively while maintaining the same package and pinout.