MAX6129AEUK33+T

Overview

The MAX6129AEUK33+T is a micropower, low-dropout bandgap voltage reference in a 5-pin SOT23 package. It provides a fixed 3.3V output with ±0.4% initial accuracy and a maximum temperature coefficient of 40ppm/°C. The device operates within a supply range of 2.5V to 12.6V, drawing a maximum supply current of 5.25µA. It sources up to 4mA and sinks up to 1mA of load current, featuring a dropout voltage as low as 200mV at full source current. Internal compensation ensures stability with capacitive loads up to 10µF without external components.

Feature Summary

• Ultra-low quiescent supply current for extended battery life
• High precision with tight initial accuracy and low temperature drift
• Stable operation with significant capacitive loads without external compensation
• Miniature surface-mount footprint reduces board space requirements

Applications

• Battery-powered portable systems
• Handheld measurement instruments
• Precision analog-to-digital and digital-to-analog converters
• Precision power supply references

Procurement Notes

Verify the specific suffix 'EUK33' confirms the 3.3V output voltage and SOT23-5 packaging. Confirm the 'A' grade designation indicates the tighter ±0.4% accuracy and 40ppm/°C temperature coefficient rather than the standard B grade. Ensure the '+T' suffix denotes tape-and-reel delivery format if required by assembly equipment. Cross-reference the top mark 'ADRW' against the manufacturer's selector guide to validate authenticity and exact electrical specifications.

Selection Notes

Select this component when board space is constrained due to its compact SOT23-5 form factor. Choose this part for applications requiring minimal static power consumption from the supply rail. Opt for the A-grade variant when system accuracy demands strict limits on initial error and thermal drift. Ensure the input voltage remains above the output voltage plus the specified dropout threshold under maximum load conditions.

Part Context

This device belongs to the MAX6129 family of ultra-low-power series voltage references manufactured by Maxim Integrated. The family offers multiple fixed output voltages including 2.048V, 2.5V, 3V, 3.3V, 4.096V, and 5V. Variants are available in both packaged SOT23-5 form factors and die form. The family shares common architectural features such as internal compensation and low dropout characteristics designed for efficiency in portable electronics.

Replacement Considerations

Direct pin-compatible replacements within the same family include MAX6129AEUK30+T (3.0V) and MAX6129AEUK25+T (2.5V), provided the circuit design accommodates the different reference voltage levels. Other Maxim voltage references with similar SOT23-5 packages and low-power profiles may serve as functional substitutes if electrical parameters align with system requirements.