INA281A3QDBVRQ1

Overview

The INA281A3QDBVRQ1 is an AEC-Q100 qualified, unidirectional current-sense amplifier from Texas Instruments. It features a wide common-mode voltage range of –4 V to +110 V and operates on a single supply from 2.7 V to 20 V. The device provides a fixed gain of 100 V/V with a typical offset voltage of ±30 µV and a maximum gain error of ±0.5%. It offers a bandwidth of 1 MHz and a slew rate of 2.5 V/µs, drawing 1.5 mA of quiescent current. Packaged in a space-saving SOT-23 (DBV) format, it supports automotive temperature grades from –40 °C to +125 °C.

Feature Summary

• High precision measurement capability enabled by low offset voltage and high DC common-mode rejection ratio.
• Wide operational common-mode voltage range allows for both high-side and low-side sensing applications.
• Fast response characteristics suitable for rapid overcurrent detection and protection scenarios.

Applications

• Automatic transmission systems
• Automotive HVAC compressor modules
• Valve and motor actuators
• Gasoline and diesel engine platforms
• Pump control circuits

Procurement Notes

Verify the specific suffix 'A3' confirms the 100 V/V gain configuration before procurement. Ensure the 'Q1' designation matches the required automotive qualification standards for the target application environment. Confirm the DBV package variant aligns with PCB layout constraints.

Selection Notes

Select this component when a fixed 100 V/V gain is optimal for the system's dynamic range requirements. Consider the 1 MHz bandwidth sufficient for the intended signal frequencies. Evaluate the 1.5 mA quiescent current against power budget constraints. Verify that the 110 V common-mode limit covers the maximum bus voltage present in the circuit.

Part Context

This part belongs to the INA281-Q1 family of high-precision current-sense amplifiers designed for automotive environments. The family includes variants with gains ranging from 20 V/V to 500 V/V. The INA281 series utilizes a zero-drift topology to maintain accuracy across wide temperature ranges, distinguishing it from standard operational amplifiers used in similar sensing roles.

Replacement Considerations

Direct substitutes within the same family include INA281B3QDBVRQ1, which shares identical electrical specifications but may differ in pinout orientation or internal resistor matching tolerances. Cross-family replacements require careful verification of gain, CMRR, and common-mode voltage limits.