REF3433SQDBVRQ1

Overview

The REF3433SQDBVRQ1 is an automotive-grade series voltage reference manufactured by Texas Instruments. It provides a fixed output of 3.3 V with an initial accuracy of ±0.05% and a maximum temperature coefficient of 6 ppm/°C. The device operates within an input voltage range of 3.8 V to 12 V and delivers up to 10 mA of load current. It features a quiescent current of 95 µA, low noise (16.5 µVp-p from 0.1 Hz to 10 Hz), and includes a shutdown function. The component is housed in a compact SOT-23-6 package and is rated for operation between -40°C and +125°C.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliability in vehicle environments.
• High precision performance characterized by low drift and tight initial accuracy tolerance.
• Integrated shutdown capability enables significant power reduction during inactive periods.
• Low-noise architecture ensures stable reference signals for sensitive analog circuits.

Applications

• Data acquisition systems requiring precise voltage references.
• Industrial process control instrumentation.
• Medical equipment utilizing high-resolution signal chains.
• Battery-powered devices necessitating low quiescent current consumption.

Procurement Notes

Verify the specific suffix 'S' against official documentation to confirm it denotes the intended quality or packaging variant, as standard REF3433 variants may lack this designation. Ensure the source document explicitly supports the automotive grade status and the exact electrical parameters listed. Cross-reference the manufacturer's part number to avoid confusion with non-automotive equivalents.

Selection Notes

Select this component when designing for automotive applications requiring a small footprint and high stability. The SOT-23-6 package offers space efficiency compared to larger alternatives. Consider the 10 mA output current limit for driving downstream loads directly. Evaluate the 6 ppm/°C temperature coefficient against system thermal requirements to ensure long-term accuracy without external calibration.

Part Context

This part belongs to the REF34xx family of precision voltage references from Texas Instruments. The 'Q1' suffix indicates automotive qualification, while 'S' typically denotes specific manufacturing or testing criteria defined by the manufacturer. It serves as a stable reference for ADCs and DACs in harsh environments where standard commercial parts might fail due to thermal or vibration stress.

Replacement Considerations

Direct substitutes include other AEC-Q100 qualified series references such as the REF3430QDBVRQ1 (3.0 V) or REF3433IDBVRQ1 (non-automotive). Verify pinout compatibility and thermal characteristics before swapping. Non-automotive versions like the REF3433IDBVR lack the required automotive reliability certifications.