LM431ACM/NOPB

Voltage Reference Overview

The LM431ACM/NOPB is an adjustable precision shunt voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It operates within a supply voltage range of 2.495 V to 37 V and features an initial accuracy of 2%. The device has a maximum shunt current of 100 mA and a temperature coefficient of 97 ppm/°C. It functions in a surface-mount SOIC-8 package with an operating temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides stable reference voltage via two-terminal shunt regulation architecture
• Offers precise output adjustment across a wide voltage span
• Ensures thermal stability through low temperature coefficient characteristics

Voltage Reference Applications

• Precision power supply regulation circuits
• Voltage monitoring systems
• Comparator reference sources

Voltage Reference Procurement Notes

Verify the manufacturer designation as Texas Instruments for this specific part number, as National Semiconductor operations were acquired. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the SOIC-8 package type matches the required PCB footprint and soldering profile specifications.

Voltage Reference Selection Notes

Select this component when a 2% initial accuracy is sufficient for the application requirements. Consider the 100 mA maximum shunt current limit for load handling capabilities. Evaluate the 97 ppm/°C temperature coefficient against the expected thermal environment to ensure long-term stability needs are met.

Voltage Reference Part Context

This device belongs to the LM431 series of adjustable precision Zener shunt regulators. It serves as a direct replacement for legacy National Semiconductor parts while adhering to modern environmental standards. The family provides a cost-effective solution for applications requiring reliable voltage referencing without complex circuitry.

Voltage Reference Replacement Considerations

LM431ACMX/NOPB (Tape and Reel variant)

Voltage Reference FAQ

What is the minimum operating voltage for the LM431ACM/NOPB?

The device requires a minimum operating voltage of 2.495 V to function correctly.

Does the NOPB suffix affect the electrical performance?

No, the NOPB suffix only indicates that the component is lead-free and RoHS compliant; electrical parameters remain identical to the non-NOPB version.