INA181A4QDCKRQ1

Overview

The INA181A4QDCKRQ1 is a single-channel, bidirectional current-sense amplifier from the INAx181-Q1 family. It features a fixed gain of 200 V/V and operates with a supply voltage between 2.7 V and 5.5 V. The device supports a common-mode input range from -0.2 V to 26 V, enabling high-side and low-side sensing. Key electrical specifications include a bandwidth of 105 kHz, a maximum quiescent current of 260 µA, and an offset voltage of ±150 µV at zero common-mode voltage. It is housed in a 6-pin SC-70 package.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions
• Integrated matched resistor network providing a fixed gain of 200 V/V
• Wide common-mode voltage 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

Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape-and-reel configuration. Confirm AEC-Q100 qualification status for automotive deployment. Ensure the selected gain option aligns with system requirements, as the A4 variant provides a fixed 200 V/V amplification factor distinct from other family members.

Selection Notes

Select this component when a high fixed gain of 200 V/V is required for precise low-current measurements. The wide common-mode range allows flexibility in high-side or low-side placement. Consider the 105 kHz bandwidth for applications requiring moderate response speeds. Verify thermal performance within the SC-70 package for the intended operating environment.

Part Context

This device belongs to the INAx181-Q1 family of automotive-grade current-sense amplifiers. The family includes dual-channel (INA2181-Q1) and quad-channel (INA4181-Q1) variants. The A4 designation specifically indicates the 200 V/V gain option within the single-channel INA181-Q1 lineup, distinguishing it from lower gain configurations like the A1, A2, and A3 devices.

Replacement Considerations

INA181A3QDCKRQ1

FAQ

How does the REF pin function in bidirectional sensing?

The REF pin applies a voltage offset to the output. A positive differential input results in an output greater than the reference voltage, while a negative differential input results in an output less than the reference voltage.

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

No, the common-mode range is not restricted by the supply voltage as long as the supply stays within the operational range of 2.7 V to 5.5 V.