INA181A3QDCKRQ1

Overview

The INA181A3QDCKRQ1 is a single-channel, bidirectional current-sense amplifier from the INAx181-Q1 family. 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, independent of the supply voltage. Key electrical specifications include a maximum quiescent current of 260 µA, a bandwidth of 150 kHz, and an output slew rate of 2 V/µs. It is qualified for automotive applications under AEC-Q100 standards.

Feature Summary

• Bidirectional current sensing capability allows detection of current flow in both directions by offsetting the output voltage via the REF pin.
• Integrated matched resistor gain network minimizes gain error and reduces temperature drift compared to external resistor configurations.
• Wide common-mode voltage range enables high-side and low-side current sensing on rails up to 26 V while powered by lower voltages.

Applications

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

Procurement Notes

Verify the specific suffix 'DCKRQ1' corresponds to the SC-70-6 package and tape-and-reel orientation. Confirm the 'Q1' designation ensures compliance with AEC-Q100 Grade 1 requirements for the specified temperature range. Cross-reference the manufacturer part number against official distributor catalogs to ensure authenticity and correct revision level before procurement.

Selection Notes

Select this component when a fixed gain of 100 V/V is required for bidirectional current monitoring. Ensure the application operates within the 2.7 V to 5.5 V supply range and requires handling common-mode voltages up to 26 V. Consider the 150 kHz bandwidth and 260 µA quiescent current if power efficiency and signal speed are critical constraints for the design.

Part Context

This device belongs to the INAx181-Q1 family of automotive-grade current-sense amplifiers. It shares architectural similarities with the dual-channel INA2181-Q1 and quad-channel INA4181-Q1. The family offers fixed gain options of 20, 50, 100, and 200 V/V, with the A3 variant specifically providing 100 V/V gain in a compact surface-mount package suitable for space-constrained automotive PCB layouts.

Replacement Considerations

INA181A3QDBVRQ1 (SOT-23-6 package)

FAQ

How does the INA181A3QDCKRQ1 handle bidirectional current?

It senses current in both directions by applying a reference voltage at the REF pin. Positive differential inputs result in an output greater than VREF, while negative inputs result in an output less than VREF.

What is the maximum common-mode voltage supported?

The device supports a common-mode voltage range from -0.2 V to 26 V, allowing it to operate independently of its 2.7 V to 5.5 V supply voltage.