LM431SBCMLX

Voltage Reference Overview

The LM431SBCMLX is a three-terminal programmable shunt regulator manufactured by Fairchild Semiconductor. It features an adjustable output voltage range from approximately 2.5 volts to 36 volts, set via two external resistors. The device offers low dynamic output impedance and a typical sink current capability between 1.0 mA and 100 mA. It maintains thermal stability over the operating temperature range with an equivalent full-range temperature coefficient of 50 ppm/°C. Packaged in SOT-89-3 for surface mount applications, it provides fast turn-on response and low output noise.

Voltage Reference Feature Summary

• Programmable output voltage adjustable up to 36 volts using external resistors
• Low dynamic output impedance for stable regulation performance
• Fast turn-on response characteristic suitable for Zener diode replacement
• Thermal stability maintained across the full rated operating temperature range

Voltage Reference Applications

• Precision voltage reference circuits
• Adjustable power supply regulators
• Battery-operated equipment requiring stable reference voltages

Voltage Reference Procurement Notes

Verify the specific suffix 'SBCMLX' against official Fairchild documentation to confirm package type, temperature grade, and reel specifications. Ensure compatibility with surface mount assembly processes for the SOT-89-3 form factor. Cross-reference datasheet revisions to confirm pinout consistency and electrical limits before integration into production designs.

Voltage Reference Selection Notes

Select this component when a precise, adjustable shunt regulator is required in a compact surface-mount footprint. The device serves as a direct replacement for fixed Zener diodes where voltage flexibility is needed. Consider the 50 ppm/°C temperature coefficient and 100 mA maximum sink current when designing feedback networks for linear power supplies or reference sources.

Voltage Reference Part Context

The LM431 series represents a family of three-terminal adjustable precision shunt regulators widely used in power management. Manufactured by Fairchild Semiconductor, these devices provide a stable reference voltage that can be programmed over a wide range. The LM431SBCMLX variant specifically denotes the surface-mount packaging configuration within this established product line.

Voltage Reference Replacement Considerations

Compatible substitutes include LM431 variants from Texas Instruments, National Semiconductor, and NXP Semiconductors. Verify pinout alignment and electrical parameter equivalence, particularly dynamic impedance and temperature coefficients, when substituting across different manufacturers.