LM431SCCMLX

Voltage Reference Overview

The LM431SCCMLX is a three-terminal adjustable shunt regulator from onsemi, housed in an SOT-89 package. It features a reference voltage of approximately 2.5 V with a tolerance of 0.5%. The output voltage is programmable between the reference level and 36 V using two external resistors. Key electrical characteristics include a typical dynamic output impedance of 0.2 Ω, a sink current capability ranging from 1.0 to 100 mA, and a full-range temperature coefficient of 50 ppm/°C. The device operates within a temperature range of -25°C to +85°C.

Voltage Reference Feature Summary

• Programmable output voltage adjustable via external resistors
• Temperature compensated for stable operation across the rated range
• Low dynamic output impedance for precise regulation
• Fast turn-on response suitable for zener diode replacement

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify component availability status prior to procurement as this specific part number may be discontinued. Confirm that the SOT-89 package and 0.5% tolerance meet design requirements. Ensure compliance with RoHS standards and check for alternative sourcing channels if direct supply is unavailable. Validate thermal resistance parameters against system constraints.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable voltage reference with high accuracy is required. The 0.5% initial accuracy makes it suitable for precision applications. Consider the SOT-89 package size for space-constrained PCB layouts. Evaluate the 100 mA maximum sink current against load requirements to ensure adequate headroom for regulation stability.

Voltage Reference Part Context

This device belongs to the LM431SA/LM431SB/LM431SC family of programmable shunt regulators. The 'SC' designation indicates a 0.5% output voltage tolerance, distinguishing it from the 1% (SB) and 2% (SA) variants. All family members share similar functional characteristics but differ in precision specifications and operating temperature ranges.

Voltage Reference Replacement Considerations

Compatible substitutes include LM431SACMLX and LM431SBCMFX, though these offer lower accuracy tolerances of 2% and 1% respectively. Verify pinout compatibility and package dimensions when substituting. Note that some family members are listed as discontinued; confirm current production status before finalizing replacements.