INA281A4QDBVRQ1

Overview

The INA281A4QDBVRQ1 is an AEC-Q100 qualified, high-precision current-sense amplifier designed for automotive applications. It features a wide common-mode voltage range from -4 V to +110 V and operates on a single supply of 2.7 V to 20 V. The device provides a fixed gain of 200 V/V with a maximum gain error of ±0.5% and a typical offset voltage of ±30 µV. It offers a bandwidth of 900 kHz and a slew rate of 2.5 V/µs, supporting fast overcurrent protection.

Feature Summary

• Supports negative common-mode voltages down to -4 V, enabling precise measurement of recirculating currents in half-bridge configurations.
• Delivers high accuracy through low input offset voltage and excellent DC common-mode rejection ratio.
• Provides high signal throughput suitable for rapid detection and processing of fast inrush currents.

Applications

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

Procurement Notes

Verify the specific suffix 'QDBVR' corresponds to the required automotive qualification grade, SOT-23 package, and reel packaging configuration. Confirm that the 'A4' designation matches the necessary 200 V/V gain setting for your circuit design requirements before finalizing procurement.

Selection Notes

Select this component when unidirectional current sensing is required within a wide common-mode range extending below ground. The 200 V/V gain is optimal for maximizing output dynamic range while utilizing smaller shunt resistors to minimize power dissipation in low-current measurement scenarios.

Part Context

This part belongs to the INA281-Q1 family of zero-drift current-sense amplifiers. It shares the same functional architecture as other gain variants but is specifically configured for a 200 V/V gain. The Q1 suffix indicates compliance with automotive reliability standards, distinguishing it from commercial-grade counterparts.

Replacement Considerations

Direct substitutes include other INA281-Q1 variants with different gain settings (e.g., INA281B4QDBVRQ1) or the non-automotive INA281A4IDBVR, provided system qualification allows.