REF2933AIDBZR

Overview

The REF2933AIDBZR is a CMOS series voltage reference from Texas Instruments, housed in a SOT-23-3 package. It provides a fixed output voltage of 3.3 V with an initial accuracy of 2% and a temperature coefficient of 100 ppm/°C. The device operates within an input voltage range up to 5.5 V and supports a maximum shunt current of 25 mA. Typical supply current is 42 µA, with a maximum rating of 50 µA. It functions reliably across an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Provides stable 3.3 V reference output with low power consumption suitable for battery-operated systems
• Ensures precision performance through specified initial accuracy and temperature stability characteristics
• Capable of sourcing high output current for driving loads without external buffering components

Applications

• Portable instrumentation requiring low quiescent current
• Industrial process control loop-powered devices
• Data acquisition systems needing precise analog references

Procurement Notes

Verify the specific suffix 'A' indicates the 2% initial accuracy grade and 'I' denotes the industrial temperature range. Confirm the 'DBZR' suffix corresponds to the SOT-23-3 package and tape-and-reel shipping format. Ensure compatibility with system input voltage limits not exceeding 5.5 V and thermal requirements within the -40°C to +125°C operational window before integration.

Selection Notes

Select this component when a moderate accuracy level of 2% is sufficient for the application, offering a balance between cost and performance. It is appropriate for designs where the 100 ppm/°C drift is acceptable compared to higher precision alternatives like the REF3033 or REF3333 series. Consider the 42 µA typical current draw for strict power budget constraints in portable equipment.

Part Context

This part belongs to the REF29xx family of CMOS voltage references designed for general-purpose applications. Unlike the higher-precision REF30xx or ultra-low-power REF33xx series, the REF29xx series prioritizes standard accuracy and robustness. It serves as a foundational reference solution for non-critical analog circuits where extreme precision is not mandatory.

Replacement Considerations

Direct substitutes include other parts within the REF29xx family with different voltage outputs or accuracy grades, such as REF2930 or REF2950. For improved precision, consider the REF3033AIDBZR (0.2% accuracy) or REF3333AIDBZR (0.15% accuracy), noting differences in temperature coefficients and supply currents.