LM431AIM3/NOPB

Voltage Reference Overview

The LM431AIM3/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 ±2.2%. The device supports a maximum shunt current of 100 mA and has a temperature coefficient of 50 ppm/°C. It is housed in a surface-mount SOT-23-3 package and functions reliably across an operating temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides adjustable reference voltage functionality using a shunt regulation topology
• Delivers high precision with a specified initial accuracy tolerance
• Supports industrial temperature operation for reliable performance

Voltage Reference Applications

• Precision voltage references in measurement systems
• Programmable output power supplies
• Battery-operated equipment requiring stable reference voltages

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' indicates RoHS compliance and lead-free construction as per Texas Instruments documentation. Confirm the 'A' grade designation matches the required ±2.2% accuracy specification for your design. Ensure the SOT-23-3 package dimensions align with your PCB footprint requirements before finalizing procurement.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable shunt regulator with moderate precision is required. The ±2.2% accuracy suits applications where tighter tolerances are unnecessary. Consider the 100 mA current capability against load requirements. The SOT-23-3 package offers space efficiency for compact designs compared to through-hole alternatives.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable precision Zener diodes. It serves as a direct replacement for standard fixed-voltage Zener diodes in many circuits while offering programmability. The NOPB suffix denotes environmental compliance, distinguishing it from older non-compliant variants within the same functional family.

Voltage Reference Replacement Considerations

LM431CIM3/NOPB offers higher accuracy at ±0.5% but may have different thermal characteristics.