LM431SCCM3X

Voltage Reference Overview

The LM431SCCM3X is a three-terminal programmable shunt regulator manufactured by onsemi in the SOT-23 package. It provides an adjustable output voltage ranging from approximately 2.5 V to 36 V using two external resistors. The device features a typical dynamic output impedance of 0.2 Ω and supports a cathode current range of 1.0 mA to 100 mA. It includes temperature compensation for operation over a full rated operating temperature range, with low output noise voltage and a fast turn-on response.

Voltage Reference Feature Summary

• Programmable output voltage capability up to 36 volts via external resistor divider
• Low dynamic output impedance ensuring stable regulation performance
• Temperature compensated design for reliable operation across the rated temperature range
• Fast turn-on characteristic suitable for replacing Zener diodes

Voltage Reference Applications

• Shunt regulator circuits
• Output control for three-terminal fixed regulators
• High current shunt regulator configurations
• Current limit or current source applications
• Constant-current sink designs

Voltage Reference Procurement Notes

Verify the specific suffix 'M3X' corresponds to the SOT-23 tape and reel packaging format as defined in the ordering information. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing process. Ensure the selected variant matches the required initial accuracy tolerance for the target application.

Voltage Reference Selection Notes

Select this component when a precise, adjustable reference voltage is required within a compact surface-mount footprint. Consider the thermal resistance characteristics of the SOT-23 package for power dissipation calculations. Evaluate the minimum cathode current requirement against the expected load conditions to ensure proper regulation is maintained throughout the operating cycle.

Voltage Reference Part Context

This part belongs to the LM431SA/LM431SB/LM431SC family of programmable shunt regulators. The 'SC' designation indicates a specific initial accuracy tolerance level compared to other variants in the series. The device serves as a direct replacement for standard Zener diodes in many linear regulation applications requiring higher precision and lower dynamic impedance.

Voltage Reference Replacement Considerations

Direct replacements include LM431SACM3X and LM431SBCM3X from the same manufacturer family. Verify pinout compatibility between SOT-23 variants before substitution. Cross-manufacturer equivalents may require validation of reference voltage deviation and temperature coefficient specifications.