MAX6138BEXR33+T

Overview

The MAX6138BEXR33+T is a precision, two-terminal shunt mode bandgap voltage reference with a fixed reverse breakdown voltage of 3.3V. It operates within an extended temperature range from -40°C to +85°C and features a maximum initial accuracy of 0.2% and a guaranteed temperature coefficient of 25ppm/°C. The device supports a wide operating current range from 60μA to 15mA, ensuring stable performance across varying load conditions. It utilizes a subminiature 3-pin SC-70 surface-mount package.

Feature Summary

• Ultra-small 3-pin SC-70 surface-mount package for space-critical applications
• Laser-trimmed resistors ensure precise initial accuracy without external calibration
• Operates stably with capacitive loads without requiring external stabilizing capacitors

Applications

• Portable, battery-powered equipment
• Notebook computers
• Cell phones
• Industrial process control

Procurement Notes

Verify the specific suffix 'B' indicates the 0.2% initial accuracy grade when sourcing this component. Confirm that the '+T' designation corresponds to the reel packaging format required for your assembly line. Ensure the SC-70 footprint matches your PCB layout design specifications before finalizing procurement orders.

Selection Notes

Select this component when a compact form factor is required alongside high precision in a shunt configuration. The 3.3V output aligns with standard logic levels, while the low minimum operating current of 60μA makes it suitable for energy-efficient designs. Verify that the source resistor calculation maintains the shunt current within the specified 60μA to 15mA operational window.

Part Context

This part belongs to the MAX6138 family of precision shunt voltage references manufactured by Analog Devices / Maxim Integrated. The series offers multiple fixed reverse breakdown voltages including 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V. All variants share the same ultra-small SC-70 package and bandgap architecture.

Replacement Considerations

The MAX6138 provides higher precision in a smaller package compared to LM4040 or LM4050 devices. When replacing legacy components, verify that the new shunt reference can handle the existing circuit's maximum reverse current without exceeding the 20mA absolute maximum rating.