REF3133AIDBZR

Overview

The REF3133AIDBZR is a fixed series voltage reference from Texas Instruments, delivering a nominal output of 3.3 V in a compact SOT-23-3 surface-mount package. It features an initial accuracy of ±0.2% and a maximum temperature coefficient of 20 ppm/°C across the -40°C to +125°C operating range. The device operates with a supply voltage between 3.35 V and 5.5 V, drawing a typical quiescent current of 100 µA. It supports a maximum shunt current of 10 mA and maintains stability without external load capacitors.

Feature Summary

• Ultra-small SOT-23-3 footprint designed for space-constrained portable applications
• Low dropout operation allowing functionality with input voltages only slightly above the output level
• Capacitor-free stability ensuring reliable performance under any capacitive load condition
• High precision with tight initial tolerance and low temperature drift specifications

Applications

• Portable and battery-powered electronic devices
• Data acquisition systems requiring stable reference voltages
• Medical equipment utilizing precision signal conditioning
• Handheld test and measurement instruments

Procurement Notes

Verify the specific suffix 'AIDBZR' against official Texas Instruments documentation to confirm the exact grade, reel packaging, and RoHS compliance status. Ensure the ordering information matches the required initial accuracy and temperature coefficient specifications for your design. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and current production status before procurement.

Selection Notes

Select this component when a balance of high precision, low power consumption, and minimal board space is required. The 3.3 V output makes it suitable for interfacing directly with modern microcontrollers and ADCs. Consider the 20 ppm/°C drift if operating in environments with significant thermal variations. Verify that the 10 mA output current capability meets the load requirements of the downstream circuitry.

Part Context

This part belongs to the REF31xx family of precision, low-power, low-dropout series voltage references. The family is characterized by its ability to operate with minimal quiescent current while maintaining high accuracy in a tiny package. The REF3133 variant specifically provides a 3.3 V output, distinguishing it from other members like the REF3112 or REF3125 which offer different voltage levels within the same architectural framework.

Replacement Considerations

Direct pin-compatible replacements within the same series include REF3133AIDBZT (tape and reel vs. cut tape) or REF3133AIDBZRG4. For lower power needs, consider the REF3033AIDBZR, though it has higher drift. Higher precision options include the REF3233 or REF3433 series, but these require different packages or have different electrical characteristics.