INA281A5QDBVRQ1

Overview

The INA281A5QDBVRQ1 is an automotive-grade, unidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 500 V/V and operates with a common-mode voltage range from –4 V to +110 V. The device supports a supply voltage between 2.7 V and 20 V, drawing a typical quiescent current of 1.5 mA. It offers a bandwidth of 900 kHz and a slew rate of 2.5 V/µs. Key electrical characteristics include a maximum gain error of ±0.5%, a typical offset voltage of ±15 µV, and a DC CMRR of 120 dB. It is housed in a space-saving SOT-23 (DBV) package.

Feature Summary

• High precision measurement capability enabled by low offset voltage and high DC common-mode rejection ratio.
• Wide operational common-mode voltage range extending from negative potentials below ground up to 110 V.
• High-speed response suitable for rapid overcurrent detection and protection applications.
• Fixed internal gain configuration optimized for high dynamic range signal amplification.

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 'A5' confirms the 500 V/V gain setting required for your design. Ensure the 'Q1' designation matches your automotive qualification standards. Confirm the 'DBVR' package variant aligns with your PCB footprint requirements. Cross-reference the datasheet revision history for any updates to electrical specifications or recommended operating conditions before finalizing procurement.

Selection Notes

Select this component when a fixed high gain of 500 V/V is necessary for small differential signals. The wide common-mode range allows flexibility in both high-side and low-side sensing topologies. Consider the 900 kHz bandwidth limit for high-frequency noise filtering requirements. Evaluate the 1.5 mA quiescent current against system power budgets. Verify that the unidirectional operation meets the current flow direction needs of the application.

Part Context

This part belongs to the INA281-Q1 family of high-precision current-sense amplifiers designed for automotive environments. The family provides multiple gain options ranging from 20 V/V to 500 V/V to suit various dynamic range requirements. All variants share the same wide common-mode input range and robust packaging, differing primarily in their internal fixed gain settings and corresponding offset voltage specifications.

Replacement Considerations

Direct substitutes within the same family include INA281B5QDBVRQ1, which shares identical electrical performance but may differ in manufacturing lot or minor parameter tolerances. Other gain variants like INA281A4QDBVRQ1 are not direct replacements due to different fixed gain values.