LM431BCZ

Voltage Reference Overview

The LM431BCZ is a precision shunt voltage reference manufactured by National Semiconductor (TI). It operates within a supply voltage range of 2.7 V to 36 V and provides an adjustable output voltage from 1.24 V to 36 V. The device features a typical temperature coefficient of 50 ppm/°C and maintains a low dynamic impedance of 0.2 Ω. It supports a cathode current range of 0.1 mA to 100 mA and is housed in a compact SOT-23-5 surface-mount package.

Voltage Reference Feature Summary

• Provides stable, adjustable reference voltage with high accuracy
• Low dynamic impedance ensures minimal output variation under load changes
• Wide operating voltage range accommodates diverse circuit requirements
• Compact SOT-23-5 package facilitates space-constrained designs

Voltage Reference Applications

• Precision voltage regulation circuits
• Portable equipment power management
• Battery-powered systems requiring stable references
• Linear and switching regulator feedback loops

Voltage Reference Procurement Notes

Verify the manufacturer marking on the component body to confirm it originates from National Semiconductor or Texas Instruments. Ensure the part number suffix matches the specific tolerance and package variant required for your design. Cross-reference the date code and lot number against official distributor records to authenticate the component's provenance and avoid counterfeit risks.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable shunt reference is needed for general-purpose applications. Consider the 0.2 Ω dynamic impedance for stability in feedback networks. Verify that the 100 mA maximum cathode current meets the load requirements. The SOT-23-5 package is suitable for automated assembly processes in consumer electronics manufacturing.

Voltage Reference Part Context

The LM431 series is a widely used family of programmable shunt regulators. The BCZ suffix typically denotes a specific binning for initial accuracy and temperature performance within the standard LM431 product line. This component serves as a fundamental building block for analog signal conditioning and power supply control in industrial and consumer applications.

Voltage Reference Replacement Considerations

Direct replacements include LM431AIMX/NOPB and LM431BIMX/NOPB from Texas Instruments, which offer similar electrical characteristics and pin compatibility. Alternative manufacturers such as Diodes Incorporated offer equivalent parts like AZ431BAZTR, but verify pinout and thermal specifications before substitution.