LM431ACM3X-NS

Voltage Reference Overview

The LM431ACM3X-NS is a programmable shunt voltage reference manufactured by National Semiconductor. It operates within an input voltage range of 2.5 V to 36 V and provides an adjustable output voltage starting from 2.495 V. The device features an initial accuracy of ±1% and a temperature coefficient of 50 ppm/°C. It supports a maximum shunt current of 100 mA with a minimum cathode current of 1 mA for regulation. Operating temperatures span from -40°C to +85°C, and it is housed in a SOT-23-3 surface-mount package.

Voltage Reference Feature Summary

• Provides precise programmable shunt regulation for voltage reference applications
• Maintains stable performance across a wide operating temperature range
• Offers high accuracy with low temperature drift characteristics

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Feedback control loops in switching regulators
• Portable equipment requiring compact voltage standards

Voltage Reference Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as National Semiconductor was acquired by TI. Confirm the specific suffix 'NS' aligns with official datasheet documentation for this part number variant. Ensure the component matches the SOT-23-3 package type and meets the specified electrical tolerances before integration into designs.

Voltage Reference Selection Notes

Select this component when a compact, adjustable shunt reference is required with ±1% initial accuracy. It is suitable for applications needing regulation down to 1 mA cathode current. Consider the SOT-23-3 package for space-constrained PCB layouts. Verify thermal performance requirements against the -40°C to +85°C operating range.

Voltage Reference Part Context

This component belongs to the LM431 family of programmable shunt voltage references. These devices function similarly to Zener diodes but offer adjustable output voltages via external resistors. The LM431 series is widely used in industrial and consumer electronics for providing stable reference voltages in feedback networks and monitoring circuits.

Voltage Reference Replacement Considerations

Compatible substitutes include the LM431AIM3X-NS for improved accuracy and the LM431BIM3X-NS for tighter tolerance specifications. Other equivalents may include parts from ON Semiconductor or Texas Instruments that match the SOT-23-3 package and electrical parameters.