MAX6138AEXR50+T

Overview

The MAX6138AEXR50+T is a precision, two-terminal shunt mode bandgap voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed reverse breakdown voltage of 5.0V with an initial accuracy of 0.1% and a maximum temperature coefficient of 25ppm/°C. The device operates within a temperature range of -40°C to +85°C and supports a shunt current capability from 60μA to 15mA. It utilizes a subminiature 3-pin SC-70 surface-mount package.

Feature Summary

• Ultra-small 3-pin SC-70 surface-mount package
• Laser-trimmed resistors ensure precise initial accuracy
• Low dynamic impedance ensures stable reverse breakdown voltage
• Operational stability without external stabilizing capacitors

Applications

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

Procurement Notes

Verify the specific suffix 'EXR50' corresponds to the 5.0V output variant and confirm the 'A' grade for 0.1% accuracy. Ensure the ordering code includes the '+T' designation for tape-and-reel packaging. Cross-reference the manufacturer's official documentation to validate RoHS compliance status and confirm the component matches the exact pinout configuration required for the target application circuit.

Selection Notes

Select this component when space constraints necessitate a subminiature footprint smaller than standard SOT-23 packages. It is suitable for applications requiring high precision and low noise in portable devices. Verify that the system supply voltage and load current requirements allow operation within the specified 60μA to 15mA shunt current range to maintain regulation.

Part Context

This part belongs to the MAX6138 family of precision shunt voltage references. The family offers multiple fixed reverse breakdown voltages including 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V. Variants are available in three grades of initial accuracy ranging from 0.1% to 0.5%, all housed in the same compact 3-pin SC-70 package.

Replacement Considerations

The datasheet identifies the LM4040/LM4050 as comparable devices. However, the MAX6138 occupies a significantly smaller package area (50% smaller than SOT-23). Direct substitution requires verifying that the alternative component fits the physical SC-70 land pattern and meets the electrical specifications.