MAX6138AEXR30-T

Overview

The MAX6138AEXR30-T is a precision, two-terminal shunt mode bandgap voltage reference manufactured by Analog Devices Inc. under the Maxim Integrated brand. It provides a fixed reverse breakdown voltage of 3V with an initial accuracy of 0.1% 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.

Feature Summary

• Laser-trimmed resistors ensure precise initial accuracy for high-performance applications.
• Subminiature 3-pin SC-70 package offers significant size reduction compared to SOT-23 devices.
• Two-terminal shunt configuration simplifies circuit design and reduces component count.

Applications

• Space-critical electronic designs requiring minimal footprint.
• Portable battery-powered equipment where low static current is essential.
• Precision analog-to-digital converter (ADC) reference sources.

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to procurement. Ensure the ordering part number matches the required 3V output variant to avoid functional mismatches in existing designs.

Selection Notes

Select this component when a compact, high-accuracy shunt reference is required for space-constrained PCB layouts. The 0.1% initial accuracy grade suits applications demanding tight tolerance without external trimming. Consider the 15mA maximum shunt current limit to ensure adequate biasing for connected loads while maintaining regulation stability across the specified temperature range.

Part Context

This part belongs to the MAX6138 family of precision shunt voltage references. The 'A' designation specifies the 0.1% initial accuracy grade, distinguishing it from lower accuracy variants. The 'EXR30' code identifies the 3V output version packaged in the SC-70 form factor. This series is designed to replace larger packages like SOT-23 in modern miniaturized electronics.

Replacement Considerations

Compatible substitutes include other MAX6138 variants with different output voltages (e.g., MAX6138AEXR33+T for 3.3V) or accuracy grades (e.g., MAX6138BEXR30+ for 0.2% accuracy). Verify pinout compatibility and thermal characteristics before substituting with non-family components.