INA181A3IDCKR

Overview

The INA181A3IDCKR is a single-channel bidirectional current-sense amplifier from Texas Instruments, housed in a 6-pin SC-70 package. It features a fixed gain of 100 V/V and supports a common-mode voltage range from -0.2 V to +26 V. The device operates on a supply voltage between 2.7 V and 5.5 V with a maximum quiescent current of 260 µA. It offers a bandwidth of 150 kHz, an input offset voltage of ±150 µV, and a common-mode rejection ratio of 84 dB. The output provides rail-to-rail swing capability.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions
• Integrated matched resistor network for minimized gain error and temperature drift
• Wide common-mode input range independent of the power supply voltage
• Rail-to-rail output swing allowing linear operation near supply rails

Applications

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

Procurement Notes

Verify the specific ordering suffix IDCKR corresponds to the SC-70-6 package variant. Confirm the A3 designation indicates the 100 V/V fixed gain option. Ensure the component meets RoHS compliance requirements for your assembly process. Check the datasheet for moisture sensitivity level and recommended soldering profiles prior to procurement.

Selection Notes

Select this part when a fixed 100 V/V gain is required for high-side or low-side current sensing. The wide common-mode range allows operation with bus voltages up to 26 V while powered by lower supply voltages. Consider the 150 kHz bandwidth for applications requiring moderate response speeds. Verify that the SC-70 package size fits the available PCB real estate constraints.

Part Context

This component belongs to the INAx181 family of cost-optimized current-sense amplifiers. The family includes dual-channel (INA2181) and quad-channel (INA4181) variants sharing similar electrical characteristics. The A3 suffix specifically denotes the 100 V/V gain configuration within the single-channel INA181 lineup. Other options include gains of 20, 50, and 200 V/V.

FAQ

How does the REF pin function in bidirectional mode?

Applying a voltage to the REF pin offsets the output voltage, allowing the amplifier to sense positive and negative differential voltages across the sense resistor relative to this reference point.

Is the common-mode range limited by the supply voltage?

No, the common-mode range extends from -0.2 V to +26 V regardless of the supply voltage, provided the supply remains within the 2.7 V to 5.5 V operating range.