MAX6138CEXR33+T

Overview

The MAX6138CEXR33+T is a precision, two-terminal shunt mode bandgap voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed reverse breakdown output voltage of 3.3V with an initial accuracy of 0.5%. The device operates within a temperature range of -40°C to +85°C and features a maximum temperature coefficient of 25ppm/°C. It supports a wide operating current range from 60μA to 15mA and utilizes a subminiature 3-pin SC70 surface-mount package.

Feature Summary

• Ultra-small 3-pin SC70 package for space-critical applications
• Laser-trimmed resistors ensure precise initial accuracy
• Low dynamic impedance ensures stable reverse breakdown voltage
• Operates without external stabilizing capacitors

Applications

• Portable, battery-powered equipment
• Notebook computers
• Cell phones
• Industrial process control

Procurement Notes

Verify the specific suffix 'C' corresponds to the 0.5% initial accuracy grade when sourcing. Confirm the '+T' designation indicates tape-and-reel packaging. Ensure the component matches the exact pinout configuration where Pin 3 must be left floating or connected to Pin 2. Cross-reference the manufacturer's ordering information to validate availability and production status.

Selection Notes

Select this component when a compact footprint is required alongside high precision. The 3.3V output suits systems needing a stable reference near standard logic levels. Consider the 0.5% accuracy grade if tighter tolerances are not critical. Evaluate the 60μA minimum operating current against system quiescent requirements to ensure proper regulation under all load conditions.

Part Context

This part belongs to the MAX6138 family of shunt voltage references. The family offers multiple fixed reverse breakdown voltages including 1.2205V, 2.048V, 2.5V, 3.0V, 4.096V, and 5.0V. Variants are available in three grades of initial accuracy: 0.1%, 0.2%, and 0.5%. All variants share the same ultra-small SC70 package and low-noise characteristics.

Replacement Considerations

The LM4040/LM4050 series is cited as a comparable device but occupies a larger SOT23 package. Verify that any substitute maintains the 3.3V output, 0.5% accuracy, and SC70-3 package dimensions to ensure mechanical compatibility.