MAX6138CEXR30-T

Overview

The MAX6138CEXR30-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 3.0V with an initial accuracy of 0.5% and a temperature coefficient of 25ppm/°C. The device operates within a junction temperature range of -40°C to +85°C and supports a maximum shunt current of 15mA. It is housed in a subminiature 3-pin SC-70 surface-mount package measuring 1.8mm x 1.8mm, designed for space-critical applications.

Feature Summary

• Laser-trimmed resistors ensure precise initial accuracy across three grades ranging from 0.1% to 0.5%.
• Subminiature 3-pin SC-70 surface-mount package offers a footprint 50% smaller than comparable SOT-23 devices.
• Two-terminal shunt mode operation utilizes a bandgap reference architecture for stable performance.

Applications

• Space-critical electronic designs requiring minimal board area
• Portable battery-powered instrumentation systems
• Precision analog-to-digital converter (ADC) reference sources

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration. Ensure the selected grade meets the required initial accuracy specifications for the target application environment.

Selection Notes

Select this component when a compact form factor is prioritized alongside moderate precision requirements. The 0.5% accuracy grade suits applications where tighter tolerances are not critical. Evaluate thermal management needs as the device operates up to +85°C. Consider the 15mA maximum shunt current limit when designing biasing circuits for downstream loads.

Part Context

This part belongs to the MAX6138A/B/C series of shunt voltage references. The 'C' designation specifically denotes the 0.5% initial accuracy grade, distinguishing it from the higher precision A (0.1%) and B (0.2%) variants. All series members share identical pinouts and physical dimensions, facilitating design flexibility across different precision tiers.

Replacement Considerations

Direct substitutes include other MAX6138 variants such as MAX6138BEXR30+ or MAX6138AEXR30+ if higher accuracy is acceptable. Cross-brand alternatives must match the 3.0V output, SC-70-3 package, and shunt topology. Verify that any replacement maintains compatible temperature coefficients and operating current ranges.