LM431AIM3X/NOPB

Voltage Reference Overview

The LM431AIM3X/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 and features an initial accuracy of 0.5%. The device supports a maximum shunt current of 100 mA and has a temperature coefficient of 97 ppm/°C. It functions across a minimum operating temperature of -40°C and a maximum of +85°C. The component is housed in a SOT-23-3 surface-mount package.

Voltage Reference Feature Summary

• Provides adjustable reference voltage functionality with high precision.
• Capable of handling up to 100 mA of shunt current for robust regulation.
• Designed for surface-mount integration using the compact SOT-23-3 package.

Voltage Reference Applications

• Precision voltage reference circuits
• Adjustable power supply output regulation
• Comparator reference voltage generation

Voltage Reference Procurement Notes

Verify the specific suffix 'A' indicates the 0.5% accuracy grade, distinct from standard grades. Confirm the 'M3X' designation corresponds to the SOT-23-3 package type and reel packaging configuration. Ensure compatibility with RoHS directives as indicated by the NOPB suffix. Cross-reference the manufacturer part number against official Texas Instruments documentation to validate the active status and exact electrical tolerances before procurement.

Voltage Reference Selection Notes

Select this component when a 0.5% initial accuracy is required for shunt regulation applications. It is suitable for designs needing a wide output voltage range up to 37 V with moderate current capability. Consider the SOT-23-3 package constraints for PCB layout. Compare against lower accuracy variants if cost is a primary driver, or higher performance options if tighter thermal stability is needed beyond the specified 97 ppm/°C.

Voltage Reference Part Context

This device belongs to the LM431 family of adjustable precision Zener shunt regulators. It serves as a direct replacement for legacy non-RoHS versions like the LM431AIM3X. The family is widely used in industrial and consumer electronics for stable voltage referencing. The NOPB suffix confirms compliance with environmental standards while maintaining identical electrical characteristics to previous iterations.

Voltage Reference Replacement Considerations

LM431CIM3X/NOPB offers similar functionality but with 1% accuracy. LM431BCM3X/NOPB provides 2% accuracy. For through-hole requirements, consider the LM431AIZ/NOPB variant. Verify pinout compatibility when substituting with generic equivalents.