LM431BCZXA

Voltage Reference Overview

The LM431BCZXA is a three-terminal adjustable shunt regulator manufactured by onsemi. It provides programmable 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 an equivalent full-range temperature coefficient of 50 ppm/°C and maintains thermal stability across the operating temperature range of -25 °C to +85 °C. The component utilizes a TO-92 package.

Voltage Reference Feature Summary

• Programmable output voltage capability up to 36 V
• Low dynamic output impedance for stable regulation
• Temperature compensated operation over the full rated range

Voltage Reference Applications

• Shunt regulator circuits
• Replacement for Zener diodes
• Output control for three-terminal fixed regulators
• Current limit or current source applications

Voltage Reference Procurement Notes

Verify the specific ordering suffix 'A' corresponds to the Ammo packing method as documented in the manufacturer's ordering information table. Confirm that the LM431BCZXA part number aligns with the discontinued status noted in the revision history, ensuring availability through authorized channels before procurement planning.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable shunt regulator is required for general-purpose voltage reference applications. Ensure the design accommodates the specified cathode current limits and operating temperature range. Verify that the TO-92 through-hole package fits the target PCB layout constraints and mechanical requirements.

Voltage Reference Part Context

This device belongs to the LM431 family of programmable shunt regulators. It serves as a direct replacement for standard Zener diodes in many applications due to its sharp turn-on characteristic and lower dynamic impedance. The family includes variants with different accuracy grades and temperature ranges.

Voltage Reference Replacement Considerations

Check for active equivalents such as LM431BIM3/NOPB if surface mount packaging is preferred. Verify pinout compatibility (Reference, Anode, Cathode) when substituting with other manufacturers' parts.