LM431BIZ/NOPB

Voltage Reference Overview

The LM431BIZ/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 1%. 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 TO-226AA-3 (TO-92-3) package with through-hole mounting style.

Voltage Reference Feature Summary

• Adjustable output voltage capability via external resistor divider
• Low dynamic impedance for stable regulation performance
• Wide operating supply voltage range up to 37 V
• High current drive capacity suitable for load regulation

Voltage Reference Applications

• Precision voltage reference sources
• Programmable linear power supplies
• Battery management systems
• Over-voltage protection circuits

Voltage Reference Procurement Notes

Verify the specific suffix 'B' indicates 1% initial accuracy rather than standard or tighter tolerances. Confirm the 'I' denotes industrial temperature range (-40°C to +85°C). Ensure the 'Z' package code matches the required TO-92-3 through-hole form factor. Check RoHS compliance status indicated by NOPB suffix against project requirements.

Voltage Reference Selection Notes

Select this part when 1% initial accuracy is required for shunt regulation applications. Consider the 100 mA current limit for load requirements. Evaluate the TO-92-3 package for space constraints compared to surface-mount alternatives like SOT-23. Compare temperature coefficients if high thermal stability is critical for the design.

Voltage Reference Part Context

This component belongs to the LM431 family of adjustable precision zener shunt regulators from Texas Instruments. It serves as a direct replacement for legacy LM431 variants while offering improved accuracy and compliance with modern environmental standards. The family provides a cost-effective solution for voltage referencing and regulation tasks.

Voltage Reference Replacement Considerations

LM431ACM/NOPB offers similar functionality but with 2% accuracy and SOIC-8 packaging. LM431CIZ/NOPB provides 0.5% accuracy in the same TO-92-3 package. LMV431AIZ/NOPB is a low-voltage alternative with lower current capabilities.