LM431BCM3

Voltage Reference Overview

The LM431BCM3 is a three-terminal adjustable precision Zener shunt regulator manufactured by Texas Instruments. It operates within an output voltage range of 2.495 V to 37 V and features an initial accuracy of 1%. The device supports a maximum shunt current of 100 mA and maintains stability over a temperature coefficient of 97 ppm/°C. It is housed in a SOT-23-3 surface-mount package and functions reliably between -40°C and +85°C.

Voltage Reference Feature Summary

• Provides precise adjustable voltage regulation with guaranteed thermal stability across the operating temperature range.
• Offers high accuracy options including 1% tolerance for demanding reference applications.
• Features low dynamic impedance characteristics suitable for stable shunt regulation.

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators
• Battery management systems requiring accurate voltage monitoring

Voltage Reference Procurement Notes

Verify the specific suffix (e.g., NOPB) against the datasheet to confirm RoHS compliance and lead-free status, as standard LM431BCM3 may differ from commercial variants. Ensure the ordering part number matches the required accuracy grade and package type specified in the design documentation before procurement.

Voltage Reference Selection Notes

Select this component when a compact SOT-23-3 footprint is required for adjustable shunt regulation. Compare the 1% accuracy variant against higher precision options if tighter tolerances are needed. Consider the 100 mA current limit for load requirements and ensure the operating temperature range aligns with the application environment.

Voltage Reference Part Context

This component belongs to the LM431 family of adjustable shunt regulators, serving as a direct replacement for the industry-standard TL431. It provides similar functionality in a smaller surface-mount package, facilitating space-constrained designs while maintaining the established performance characteristics of the series.

Voltage Reference Replacement Considerations

LM431BCM3X/NOPB is a verified equivalent offering identical electrical specifications and pinout compatibility within the same SOT-23-3 package family.

Voltage Reference FAQ

What is the minimum reference voltage for the LM431BCM3?

The minimum adjustable reference voltage for the LM431BCM3 is 2.495 V.

Does the LM431BCM3 support surface-mount installation?

Yes, the LM431BCM3 is designed for surface-mount technology (SMT) using the SOT-23-3 package.