REF2933AIDBZT

Overview

The REF2933AIDBZT is a fixed-output CMOS voltage reference from Texas Instruments, providing a nominal output of 3.3 V. It features an initial accuracy of ±2.0% and a temperature coefficient of 100 ppm/°C. The device operates within an input voltage range up to 7 V and supports a maximum shunt current of 25 mA. It consumes a typical supply current of 50 µA and functions reliably across a temperature range of -40°C to +125°C. Packaged in a compact SOT-23-3 surface-mount case, it serves as a stable reference for precision analog circuits.

Feature Summary

• Provides a fixed 3.3 V output with high stability over temperature variations
• Operates with low quiescent current suitable for battery-powered applications
• Supports high load currents up to 25 mA for driving external loads

Applications

• Analog-to-digital converter (ADC) reference sources
• Digital-to-analog converter (DAC) voltage references
• Portable instrumentation requiring stable voltage rails
• Battery-operated measurement systems

Procurement Notes

Verify the specific suffix 'DBZT' corresponds to the SOT-23-3 package and tape-and-reel or cut-tape availability. Confirm that the ±2.0% accuracy class meets system requirements, as tighter tolerances may require alternative series members. Ensure input voltage remains below the 7 V maximum limit during operation. Check for moisture sensitivity levels if reflow soldering is planned.

Selection Notes

Select this component when a 3.3 V reference with moderate accuracy is sufficient. The 100 ppm/°C drift rate distinguishes it from higher-precision series like REF30 or REF33. Consider the 25 mA output capability against load demands. The SOT-23-3 footprint offers space efficiency compared to larger packages. Evaluate power consumption constraints given the 50 µA operating current.

Part Context

This part belongs to the REF29xx family of CMOS voltage references designed for cost-sensitive and space-constrained applications. It complements Texas Instruments' broader portfolio of precision references, offering a balance between performance and power efficiency. The device utilizes CMOS technology to achieve low current consumption while maintaining adequate stability for general-purpose data acquisition systems.

Replacement Considerations

Direct substitutes include other parts within the REF29xx series with different output voltages or accuracies. For tighter tolerance requirements, consider the REF3033 or REF3320 series. Verify pinout compatibility when replacing with similar SOT-23-3 voltage references from other manufacturers.