INA281B3QDBVRQ1

Overview

The INA281B3QDBVRQ1 is an automotive-grade current-sense amplifier with a fixed gain of 100 V/V. It operates from a single 2.7-V to 20-V supply and supports a common-mode voltage range of –4 V to +110 V. The device features a typical offset voltage of ±30 µV, a maximum DC CMRR of 140 dB, and a bandwidth of 1 MHz at this gain. It draws 1.5 mA of quiescent current and is housed in a space-saving SOT-23 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 voltages to 110 V for flexible high-side or low-side sensing.
• High-speed response characteristics suitable for fast overcurrent protection applications.

Applications

• Automatic transmission systems
• Automotive HVAC compressor modules
• Valve and motor actuators

Procurement Notes

Verify the specific suffix 'B3' confirms the 100 V/V gain configuration before procurement. Ensure the DBVR package variant matches the required PCB footprint. Confirm AEC-Q100 qualification status aligns with target automotive reliability standards.

Selection Notes

Select this component when a fixed 100 V/V amplification factor is required for precise current monitoring. The wide common-mode range accommodates high-voltage rails without external level shifting. Consider the 1 MHz bandwidth for applications requiring rapid fault detection.

Part Context

This part belongs to the INA281-Q1 family of high-precision current-sense amplifiers designed for automotive environments. The family offers multiple gain options to optimize dynamic range. The B3 designation specifically indicates the internal resistor network is set for a 100 V/V gain.

Replacement Considerations

INA281A3QDBVRQ1 provides identical electrical performance with different initial offset voltage specifications.