LM431CCMX

Voltage Reference Overview

The LM431CCMX is a three-terminal adjustable precision shunt regulator manufactured by Fairchild Semiconductor. It functions as a programmable reference voltage source with an output range spanning from the internal reference of approximately 2.5 volts up to 36 volts, determined by two external resistors. The device features a typical dynamic output impedance of 0.2 ohms and supports a sink current capability between 1.0 mA and 100 mA. It exhibits a full-range temperature coefficient of 50 ppm/°C and operates within a specified temperature range.

Voltage Reference Feature Summary

• Programmable output voltage adjustable via external resistors
• Low dynamic output impedance for stable regulation
• Temperature compensated operation across rated ranges
• Fast turn-on response characteristic

Voltage Reference Applications

• Replacement for Zener diodes in voltage reference circuits
• Precision voltage references in power supplies
• Adjustable shunt regulation in battery management systems

Voltage Reference Procurement Notes

Verify the specific suffix 'CMX' against the manufacturer's official datasheet to confirm package type and tape-and-reel specifications. Ensure the component matches the required operating temperature range and initial accuracy class defined in the original design documentation before procurement.

Voltage Reference Selection Notes

Select this component when a low-cost, high-precision adjustable shunt regulator is required. Consider the 0.2 ohm dynamic impedance and 50 ppm/°C temperature coefficient for applications demanding stability. Verify that the external resistor network can support the desired output voltage within the 36-volt maximum limit.

Voltage Reference Part Context

The LM431 series represents a family of three-terminal adjustable shunt regulators widely used in power management. The LM431CCMX variant falls under this lineage, offering thermal stability and precise voltage control. It serves as a direct functional alternative to fixed Zener diodes where adjustable thresholds are necessary.

Voltage Reference Replacement Considerations

Compatible substitutes include the LM431ACMX and LM431BCMx from Fairchild, or equivalent parts from Texas Instruments and NXP such as TL431 variants. Verify pinout compatibility and electrical parameter alignment before substitution.