INA281B1QDBVRQ1

Overview

The INA281B1QDBVRQ1 is an automotive-grade current-sense amplifier with a fixed gain of 20 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. Key electrical characteristics include a typical offset voltage of ±55 µV, a maximum DC CMRR of 140 dB, and a bandwidth of 1.3 MHz. The device draws 1.5 mA of quiescent current and functions 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 featuring low offset voltage and high DC CMRR.
• High-speed performance with 1.3 MHz bandwidth for fast overcurrent protection.

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 QDBVR indicates the automotive grade (Q1) and SOT-23-5 package variant. Confirm the B1 designation corresponds to the 20 V/V gain setting. Ensure the component meets AEC-Q100 Grade 1 requirements for the intended operating temperature range. Cross-reference the manufacturer part number against official datasheets to validate authenticity and revision status.

Selection Notes

Select this component when unidirectional current sensing is required in high-voltage automotive environments. The 20 V/V gain is suitable for applications requiring lower amplification factors compared to higher gain variants. Consider the wide common-mode range for both high-side and low-side configurations. Evaluate the 1.3 MHz bandwidth against system noise filtering needs.

Part Context

This device belongs to the INA281-Q1 family of high-precision current-sense amplifiers designed for automotive use. It shares the same core topology and specifications as other members of the series but differs in its fixed internal gain configuration. The family addresses diverse dynamic range requirements through multiple gain options while maintaining consistent accuracy and speed characteristics.

Replacement Considerations

INA281A1QDBVRQ1: Same package and gain, different offset voltage specification.

FAQ

Is the INA281B1QDBVRQ1 capable of bidirectional current sensing?

No, the INA281-Q1 family operates in unidirectional mode only, sensing current sourced from a power supply to a load.

What is the maximum survival voltage for the common-mode input?

The device supports a survival voltage range of -20 V to +120 V, exceeding the operational range of -4 V to +110 V.