LM431ACMX/NOPB

Voltage Reference Overview

The LM431ACMX/NOPB is an adjustable precision Zener shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.495 V to 37 V with an initial accuracy of 2%. The device supports a maximum shunt current of 100 mA and features a temperature coefficient of 97 ppm/°C. It functions across a temperature range from -40°C to +85°C and is housed in an SOT-23 package.

Voltage Reference Feature Summary

• Provides adjustable reference voltage functionality via external resistor divider
• Delivers high precision regulation with specified initial accuracy tolerance
• Supports low dynamic impedance for stable shunt operation

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 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 'CMX' designation corresponds to the SOT-23 surface-mount packaging variant. Ensure the 'A' grade matches the required 2% initial accuracy specification for the target application design.

Voltage Reference Selection Notes

Select this component when a compact SOT-23 footprint is required for adjustable shunt regulation. The 2% accuracy grade offers a balance between cost and performance for general-purpose applications. Verify that the 100 mA current capability meets the load requirements and that the operating temperature range aligns with environmental conditions.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable precision Zener shunt regulators. It serves as a direct replacement for legacy National Semiconductor versions, maintaining functional compatibility while adhering to modern environmental standards. The family is widely used for replacing fixed voltage references in diverse electronic designs.

Voltage Reference Replacement Considerations

LM431ACM/NOPB (SOIC-8 package) shares identical electrical characteristics but differs in physical footprint. LM431AIMX/NOPB offers improved 1% accuracy. Verify pinout compatibility and thermal dissipation requirements when substituting packages.