LM431CCZ/NOPB

Voltage Reference Overview

The LM431CCZ/NOPB is an adjustable precision Zener shunt regulator manufactured by National Semiconductor, now part of Texas Instruments. It operates within a voltage range of 2.495 V to 36 V with an initial accuracy of 0.5%. The device features a maximum shunt current of 100 mA and a temperature coefficient of 50 ppm/°C. It supports a maximum input voltage of 37 V and functions reliably between -25°C and +85°C. Housed in a TO-92R through-hole package, this component serves as a high-performance voltage reference for various electronic applications.

Voltage Reference Feature Summary

• Provides adjustable precise voltage regulation via a two-terminal shunt configuration
• Delivers tight initial accuracy of 0.5% for stable reference performance
• Features low temperature drift of 50 ppm/°C for thermal stability

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators requiring stable reference voltages
• Battery-operated equipment needing accurate voltage monitoring

Voltage Reference Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the NOPB suffix indicates lead-free and RoHS compliance. Ensure the specific CC grade matches the required 0.5% initial accuracy specification for your design. Cross-reference the TO-92R package dimensions with your PCB footprint requirements before finalizing procurement.

Voltage Reference Selection Notes

Select this component when a 0.5% accuracy tolerance is mandatory, distinguishing it from standard 1% or 2% variants like the LM431AI or LM431BI. The 50 ppm/°C temperature coefficient makes it suitable for applications requiring tighter thermal stability than the standard 97 ppm/°C devices. Consider the TO-92R package if through-hole mounting is preferred over surface-mount alternatives like the SOT-23 family.

Voltage Reference Part Context

The LM431 series represents a widely used family of adjustable precision shunt regulators originally developed by National Semiconductor. These components function similarly to programmable Zener diodes but offer superior performance characteristics. The CC variant specifically denotes the higher precision tier within the lineup, providing better initial accuracy and lower temperature drift compared to the standard C or A grades.