MAX6138AEXR21-T

Overview

The MAX6138AEXR21-T is a shunt voltage reference from the MAX6138 series, manufactured by Analog Devices Inc. (Maxim Integrated). It provides a fixed output voltage of 2.048 V with an initial accuracy of ±0.5%. The device features a temperature coefficient of 25 ppm/°C and operates within a junction temperature range of -40°C to +85°C. Packaged in a compact SC-70-3 surface-mount case, it supports a maximum shunt current of 15 mA. This component is designed for applications requiring stable, low-noise voltage references in space-constrained environments.

Feature Summary

• Provides a precise 2.048 V reference output with ±0.5% initial accuracy
• Features a low temperature coefficient of 25 ppm/°C for thermal stability
• Utilizes a compact SC-70-3 package for space-efficient PCB layouts
• Operates as a two-terminal shunt reference with high impedance input

Applications

• Portable instrumentation requiring stable voltage references
• Battery-powered systems needing low quiescent current sources
• Data acquisition systems utilizing analog-to-digital converters
• Medical equipment requiring precise signal conditioning references

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the 'A' grade designation corresponds to the required ±0.5% accuracy and 25 ppm/°C temperature coefficient specifications. Ensure the SC-70-3 footprint matches the target PCB design. Check current availability status as supply may be limited or subject to allocation due to manufacturing constraints.

Selection Notes

Select this part when a 2.048 V output is specifically required rather than standard 2.5 V or 3.0 V options. Consider the ±0.5% accuracy if tighter tolerances like ±0.1% are not necessary. Evaluate the SC-70-3 package size against available board space. Compare power dissipation capabilities at the expected operating current to ensure thermal reliability within the specified temperature range.

Part Context

The MAX6138 series offers various fixed output voltages including 2.048 V, 2.5 V, and 3.0 V. The 'A' suffix typically denotes improved accuracy grades compared to standard variants. The 'E' indicates the SC-70-3 package type. Different suffixes define output voltage, accuracy, and packaging format. This specific model targets cost-sensitive applications requiring moderate precision in small form factors.

Replacement Considerations

Direct substitutes include other MAX6138 variants with different output voltages if system requirements allow. Verify pin compatibility with SC-70-3 packages from other manufacturers. Cross-reference temperature coefficients and accuracy grades to ensure performance parity. Consult official replacement guides for equivalent parts from Analog Devices or Maxim Integrated.