INA281B4QDBVRQ1

Overview

The INA281B4QDBVRQ1 is an automotive-grade, high-precision 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 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. Qualified under AEC-Q100 standards, it functions reliably within a temperature range of –40 °C to +125 °C.

Feature Summary

• AEC-Q100 qualified for automotive applications with functional safety capability documentation.
• Wide common-mode voltage range supporting operation from –4 V to +110 V.
• High precision architecture with low offset voltage and excellent DC CMRR.
• Unidirectional sensing optimized for fast overcurrent protection detection.

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 'B4' indicates the 200 V/V gain option and 'Q1' denotes automotive qualification. Confirm the 'DBVR' package corresponds to the SOT-23-5 form factor. Ensure the component meets the required AEC-Q100 Grade 1 specifications for the target operating temperature range before integration.

Selection Notes

Select this part when unidirectional current sensing is required in high-voltage environments up to 110 V. The 200 V/V gain suits applications needing significant signal amplification for small shunt voltages. Consider the 900 kHz bandwidth for dynamic response requirements and verify that the 1.5 mA quiescent current aligns with system power constraints.

Part Context

This component belongs to the INA281-Q1 family of high-speed current-sense amplifiers designed for automotive use. It utilizes a zero-drift topology to maintain accuracy across wide temperature ranges. The device integrates internal bias networks and fixed-gain resistors to simplify circuit design while providing robust performance in noisy electrical environments.

Replacement Considerations

INA281B4IDBVRQ1