INA2181A4IDSQT

Overview

The INA2181A4IDSQT is a dual-channel, bidirectional current-sense amplifier from the INAx181 family. It features a fixed gain of 200 V/V and operates with a supply voltage range of 2.7 V to 5.5 V. The device supports common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. Key electrical specifications include a maximum quiescent current of 500 µA, a bandwidth of 105 kHz, and an offset voltage of ±150 µV at zero common-mode voltage. It provides rail-to-rail output swing and is specified over an operating temperature range of –40°C to +125°C.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions via a reference pin offset.
• Integrated matched resistor gain network minimizes gain error and reduces temperature drift.
• High bandwidth and slew rate support rapid detection of input current changes and system faults.
• Wide common-mode voltage range allows operation in high-side and low-side configurations.

Applications

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

Procurement Notes

Verify the specific suffix 'SQ' against official documentation to confirm package type and tape-and-reel specifications. Ensure the ordering code matches the required channel count and gain option. Confirm that the component meets all environmental and reliability standards required for the target application before procurement.

Selection Notes

Select this device when dual-channel precision current monitoring is required within a 26-V common-mode range. The 200 V/V gain is suitable for applications requiring high resolution from small sense resistor voltage drops. Consider the 500 µA quiescent current limit for power-constrained designs. Verify compatibility with the system's ADC input voltage range given the rail-to-rail output characteristics.

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. These devices share similar electrical characteristics but differ in channel count and package options, such as WSON or VSSOP for the dual-channel version.

Replacement Considerations

Other members of the INAx181 family may serve as alternatives if channel count or gain requirements differ. Devices like the INA2181A3 offer a 100 V/V gain option. Single-channel equivalents are available in the INA181 series. Verify pinout and thermal performance when substituting packages.