INA281B2QDBVRQ1

Overview

The INA281B2QDBVRQ1 is an automotive-grade current-sense amplifier with a fixed gain of 50 V/V. It operates over a common-mode voltage range of –4 V to +110 V and supports supply voltages from 2.7 V to 20 V. The device features a 1.3 MHz bandwidth, 120 dB DC CMRR, and ±55 µV typical offset voltage. It draws 1.5 mA quiescent current and is housed in a space-saving SOT-23 package.

Feature Summary

• Supports negative common-mode voltages down to -4 V for half-bridge recirculating current measurement
• Provides high-speed response with 1.3 MHz bandwidth for fast overcurrent protection
• Maintains precision accuracy with low offset drift and high common-mode rejection ratio

Applications

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

Procurement Notes

Verify the specific suffix 'B2' confirms the 50 V/V gain configuration required for your circuit design. Ensure the DBVR package variant matches your PCB footprint requirements. Confirm AEC-Q100 qualification aligns with your automotive reliability standards before finalizing component selection.

Selection Notes

Select this part when unidirectional sensing within a wide common-mode range is necessary. The 50 V/V gain suits applications requiring moderate signal amplification without excessive power dissipation across the shunt resistor. Consider the 1.3 MHz bandwidth if rapid transient detection is critical for system protection.

Part Context

This component belongs to the INA281-Q1 family of high-precision current-sense amplifiers designed for automotive environments. The family offers multiple gain options ranging from 20 V/V to 500 V/V. The B2 designation specifically indicates the internal fixed gain setting of 50 V/V, distinguishing it from other variants in the series.

Replacement Considerations

INA281A2QDBVRQ1