INA281A2QDBVRQ1

Overview

The INA281A2QDBVRQ1 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 50 V/V with a typical offset voltage of ±55 µV and a maximum gain error of ±0.5%. It offers a bandwidth of 1.3 MHz and a quiescent current of 1.5 mA. Packaged in a space-saving SOT-23 (DBV) format, it supports automotive temperature grades from –40 °C to +125 °C.

Feature Summary

• Supports negative common-mode voltages down to -4 V for precise measurement of recirculating currents in half-bridge applications.
• Features high-speed response with 1.3 MHz bandwidth and 2.5 V/µs slew rate for rapid overcurrent protection detection.
• Utilizes zero-drift topology to maintain low offset voltage and drift across the full operating temperature range.

Applications

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

Procurement Notes

Verify the specific suffix 'A2' confirms the 50 V/V gain configuration. Ensure the 'Q1' designation matches the required AEC-Q100 automotive qualification standards. Confirm the DBV package variant aligns with the PCB footprint requirements. Validate that the component meets the specified functional safety documentation needs if applicable to the design.

Selection Notes

Select this part when a fixed 50 V/V gain is optimal for the system's dynamic range. The wide common-mode range accommodates both high-side and low-side sensing topologies. Consider the 1.5 mA quiescent current for power-sensitive designs. Verify that the 1.3 MHz bandwidth meets the frequency requirements for fast transient detection in the target application.

Part Context

This component 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 INA281A2QDBVRQ1 specifically denotes the 50 V/V gain version within the A-series lineup, offering a balance between signal amplification and input voltage headroom.

Replacement Considerations

Direct substitutes within the same family include INA281B2QDBVRQ1, which shares identical electrical specifications but may differ in manufacturing lot or secondary qualification details. Other gain variants like INA281A1QDBVRQ1 or INA281A3QDBVRQ1 are pin-compatible but provide different amplification factors.