MAX6138CEXR33-T

Overview

The MAX6138CEXR33-T is a precision, two-terminal shunt mode bandgap voltage reference with a fixed reverse breakdown voltage of 3.3V. It features an initial accuracy of 0.5% and a temperature coefficient of 4ppm/°C. The device supports a maximum shunt current of 15mA and operates within a temperature range of -40°C to +85°C. Packaged in a subminiature 3-pin SC-70 surface-mount package measuring 1.8mm x 1.8mm, it utilizes laser-trimmed resistors for precise calibration.

Feature Summary

• Subminiature 3-pin SC-70 surface-mount package designed for space-critical applications
• Precision two-terminal shunt mode bandgap architecture with laser-trimmed resistors
• Low temperature coefficient ensuring stable performance across operating ranges

Applications

• Space-constrained portable electronic devices
• Precision analog-to-digital converter (ADC) reference sources
• Data acquisition systems requiring stable voltage references

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration when sourcing. Confirm the manufacturer designation as Analog Devices Inc./Maxim Integrated for authenticity. Ensure the component meets RoHS compliance standards if required by your manufacturing process. Check for any lead-free certification documentation provided by the supplier.

Selection Notes

Select this component when a compact form factor is prioritized over higher current capabilities. The 15mA shunt current limit suits low-power reference applications rather than high-drive scenarios. Consider the 0.5% initial accuracy grade if tighter tolerances are not critical for the circuit design. Evaluate the SC-70 footprint against available PCB real estate constraints.

Part Context

This part belongs to the MAX6138 family of shunt voltage references, which offers multiple fixed reverse breakdown voltages including 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V. The family is characterized by its small SC-70 package, being 50% smaller than comparable SOT23 devices. Different grades (A, B, C) provide varying levels of initial accuracy while maintaining similar thermal stability characteristics.

Replacement Considerations

Compatible substitutes include other MAX6138 variants with different voltage outputs or accuracy grades, such as MAX6138BEXR33+ or MAX6138AEXR33+. Ensure replacement parts maintain the same SC-70-3 pinout and electrical specifications to guarantee direct compatibility without circuit modification.