LM431BIZX

Voltage Reference Overview

The LM431BIZX is a three-terminal adjustable shunt regulator from the LM431 family, manufactured by onsemi. It features an operating temperature range of -40°C to +85°C and a reference voltage tolerance of 1%. The device allows output voltages to be set between approximately 2.5 V 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 mA to 100 mA, and a typical full-range temperature coefficient of 50 ppm/°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
• Precision constant current sinks
• Isolated feedback loops in switch mode power supplies
• Precision current limiters

Voltage Reference Procurement Notes

Verify component status before procurement as this specific part number may be discontinued. Confirm that the TO-92 package and 1% tolerance meet design requirements. Ensure compatibility with existing thermal management solutions given the junction-to-ambient thermal resistance specifications.

Voltage Reference Selection Notes

Select the LM431BIZX when a 1% reference voltage accuracy and extended industrial temperature range are required. Compare against LM431AIZ for tighter initial accuracy or LM431CIZ for standard tolerance. Verify that the cathode current limits align with the application's load requirements.

Voltage Reference Part Context

This component belongs to the LM431 series of programmable shunt regulators. It serves as a direct functional replacement for fixed Zener diodes in many applications due to its sharp turn-on characteristic and adjustable nature. The 'I' suffix denotes the extended temperature grade compared to the standard 'C' grade.

Voltage Reference Replacement Considerations

LM431AIZ offers tighter initial accuracy (0.5%). LM431CIZ provides standard tolerance (2%). Cross-manufacturer equivalents like TL431 or KA431 share similar pinouts but require verification of specific electrical parameters.