LM431AIZ/NOPB

Voltage Reference Overview

The LM431AIZ/NOPB is an adjustable precision shunt voltage reference manufactured by Texas Instruments. It operates within a supply voltage range of 2.495V to 36V and supports a maximum cathode current of 100mA. The device features an initial accuracy tolerance of ±2.2% and maintains operation across a temperature range from -40°C to +85°C. Packaged in a TO-226AA-3 (TO-92) through-hole housing, it serves as a high-performance replacement for fixed Zener diodes in power management circuits.

Voltage Reference Feature Summary

• Provides adjustable output voltage capability using external resistors
• Delivers precise regulation with low dynamic impedance characteristics
• Operates reliably across extended industrial temperature ranges

Voltage Reference Applications

• Precision voltage references in power supply designs
• Programmable linear regulators and feedback loops
• Battery-operated equipment requiring stable reference voltages

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free compliance and RoHS adherence as per manufacturer specifications. Confirm the package designation matches the required TO-226AA-3 form factor for your PCB layout. Ensure the operating voltage requirements align with the 2.495V to 36V input range specified for this component variant.

Voltage Reference Selection Notes

Select this component when a through-hole adjustable reference is required with ±2.2% accuracy. It is suitable for applications needing up to 100mA load current. Consider thermal dissipation capabilities inherent to the TO-92 package if significant power loss occurs during operation compared to surface-mount alternatives.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable precision shunt regulators. It functions similarly to a programmable Zener diode, offering superior performance over standard fixed references. The NOPB suffix indicates a non-pb (lead-free) version compliant with environmental directives, maintaining electrical equivalence to previous iterations.

Voltage Reference Replacement Considerations

LM431CIZ-NOPB offers higher accuracy at 0.5% tolerance. LM431ACM/NOPB provides a surface-mount SOIC-8 option. LMV431AIZ/NOPB is a low-voltage alternative starting at 1.24V.