MAX6138BEXR21+T

Overview

The MAX6138BEXR21+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 2.048V with an initial accuracy of 0.2%. 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 ordering suffix against official documentation to confirm exact specifications such as accuracy grade and packaging type. Confirm RoHS compliance status through manufacturer datasheets or product compliance declarations before procurement. Ensure the component matches the required pin configuration and thermal characteristics for the intended circuit design.

Selection Notes

Select this component when a compact footprint is required alongside high-precision voltage referencing. The 0.2% accuracy grade offers a balance between cost and performance for general-purpose applications. Consider the minimum operating current requirements of the load to ensure the shunt current remains within the specified operational limits during all conditions.

Part Context

This part belongs to the MAX6138 family of precision shunt voltage references. The family includes multiple fixed reverse breakdown voltages ranging from 1.2205V to 5.0V. Variations in the middle letter (A, B, C) denote different initial accuracy grades, while the suffix indicates the specific output voltage. All variants share the same SC70 package and core bandgap architecture.

Replacement Considerations

The LM4040/LM4050 series are comparable devices but utilize larger SOT23 packages. Verify that any substitute maintains the required 2.048V output voltage and fits within the physical constraints of the SC70 footprint if space is limited.