INA2181A1IDSQT

Overview

The INA2181A1IDSQT 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, supporting common-mode voltages from -0.2 V to +26 V. It provides rail-to-rail output swing and maintains an offset voltage of ±150 µV maximum at zero common-mode voltage. The component is specified for operation across an extended temperature range of -40°C to +125°C.

Feature Summary

• Bidirectional current sensing capability allows measurement of current flow in both directions by applying a reference voltage to the REF pin.
• Integrated matched resistor gain network minimizes gain error and reduces temperature drift for improved accuracy.
• Wide common-mode input range enables high-side and low-side sensing configurations independent of the power supply voltage.

Applications

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

Procurement Notes

Verify the specific suffix 'SQ' indicates automotive qualification status as per official documentation. Confirm package details correspond to the DSQ (WSON) format. Ensure compatibility with system voltage requirements and thermal constraints before finalizing procurement specifications.

Selection Notes

Select this device for applications requiring dual-channel monitoring with a 20 V/V gain. Consider the 350 kHz bandwidth for dynamic load responses. Evaluate the 260 µA quiescent current per channel against total power budgets. Verify that the WSON package fits the available PCB footprint.

Part Context

This component 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 share similar electrical characteristics but differ in channel count and package options.

Replacement Considerations

Compatible substitutes within the same family include INA2181A1IDGST or INA2181A1DSQR. Verify pinout compatibility and ensure the replacement part matches the required gain and package dimensions.

FAQ

What is the maximum common-mode voltage supported?

The device supports a common-mode voltage range from -0.2 V to +26 V.

Is the output capable of swinging to the ground rail?

Yes, the amplifier features rail-to-rail output swing, with a maximum specified swing to GND of 5 mV under overdriven conditions.