LM431AIMX

Voltage Reference Overview

The LM431AIMX is a three-terminal adjustable shunt regulator manufactured by National Semiconductor. It provides guaranteed temperature stability across the entire operating range. The output voltage is programmable from 2.5V to 36V using two external resistors. The device features a typical reference voltage of 2.5V with an accuracy of ±2%. It supports a cathode current up to 100mA and operates within a temperature range of -40°C to 85°C. The component is housed in an 8-SOIC surface-mount package.

Voltage Reference Feature Summary

• Three-terminal adjustable shunt regulator design
• Guaranteed thermal stability over full operating temperature range
• Output voltage programmable via two external resistors

Voltage Reference Applications

• Precision voltage references
• Programmable power supplies
• Battery chargers

Voltage Reference Procurement Notes

Verify the manufacturer designation, as Texas Instruments acquired National Semiconductor. Confirm the specific suffix 'MX' corresponds to the 8-SOIC package and check for the 'NOPB' lead-free designation if required. Ensure the grade matches the specified accuracy and temperature range requirements for your application.

Voltage Reference Selection Notes

Select this component when a stable, adjustable shunt reference is needed in a surface-mount form factor. Consider the 100mA current limit and the 2.5V to 36V output range. Verify that the 8-SOIC package fits the PCB layout constraints and that the industrial temperature range meets environmental specifications.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable precision shunt regulators. It serves as a drop-in replacement for TL431 equivalents in many designs. The 'A' suffix typically denotes tighter accuracy specifications compared to standard grades. The 'MX' indicates the specific tape-and-reel or bulk packaging format for the SOIC-8 variant.

Voltage Reference Replacement Considerations

Compatible substitutes include LM431CCMX and LM431BCMX from National Semiconductor/TI. Cross-brand equivalents such as TL431 variants from other manufacturers may be functionally similar but require verification of pinout and electrical parameters.