LM431BCZX

Voltage Reference Overview

The LM431BCZX is a discontinued three-terminal programmable shunt regulator manufactured by onsemi. 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 operates within a cathode current range of 1.0 mA to 100 mA. It offers a typical temperature coefficient of 50 ppm/°C over the full operating temperature range of -25°C to +85°C. Packaged in TO-92 with tape and reel packing, it serves as a precise alternative to standard Zener diodes.

Voltage Reference Feature Summary

• Programmable output voltage capability up to 36 V via external resistor network
• Low dynamic output impedance for stable regulation performance
• Temperature compensated operation across the full rated operating range
• Fast turn-on response suitable for replacing Zener diodes

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify component status carefully before procurement. The LM431BCZX is listed as discontinued in official documentation and is not available for new orders. Confirm availability through authorized distributors or consider equivalent active replacements. Ensure all technical specifications meet design requirements prior to finalizing any supply chain decisions.

Voltage Reference Selection Notes

Select this component only if legacy compatibility is required. Verify that the TO-92 package and 1% initial accuracy suit the application constraints. Check that the -25°C to +85°C operating range covers environmental conditions. Evaluate alternative active devices if long-term supply assurance is necessary for production runs.

Voltage Reference Part Context

This part belongs to the LM431A/B/C series of programmable shunt regulators. These devices are designed for precision voltage reference and regulation tasks. The LM431BCZX specifically denotes the B-grade variant packaged in TO-92 format. It shares functional similarities with other members of the family but differs in tolerance and packaging options.

Voltage Reference Replacement Considerations

LM431CCZ, LM431ACZ, LM431BIZX