LM431BIM3/NOPB

Voltage Reference Overview

The LM431BIM3/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 has a maximum shunt current of 100 mA and a temperature coefficient of 97 ppm/°C. It supports a maximum input voltage of 37 V and functions between -40°C and +85°C. The component is housed in a SOT-23-3 surface-mount package.

Voltage Reference Feature Summary

• Adjustable reference voltage capability spanning from 2.495 V up to 37 V
• High precision performance with 1% initial accuracy tolerance
• Robust thermal stability characterized by a 97 ppm/°C temperature coefficient

Voltage Reference Applications

• Precision voltage regulation in power supply circuits
• Reference voltage generation for analog-to-digital converters
• Over-voltage protection monitoring systems

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free compliance and RoHS adherence as per manufacturer specifications. Confirm the 'M3' designation aligns with the required SOT-23-3 package variant. Ensure the 'B' grade matches the necessary 1% accuracy requirement for the design. Cross-reference the datasheet revision date to ensure compatibility with current manufacturing standards.

Voltage Reference Selection Notes

Select this component when a compact surface-mount solution is required for high-precision voltage referencing. The 100 mA shunt current capability allows for direct drive applications without additional buffering. The wide operating temperature range ensures reliability in industrial environments. Compare against lower accuracy grades if cost reduction is prioritized over precision.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable shunt regulators, widely used as a drop-in replacement for fixed Zener diodes. The LM431 series provides superior temperature stability and noise performance compared to standard Zeners. The NOPB suffix indicates a lead-free, environmentally friendly version compliant with global regulatory standards.

Voltage Reference Replacement Considerations

LM431CIM3/NOPB offers 0.5% accuracy in the same package. LM431BCM3X/NOPB provides 2% accuracy options. Verify pinout compatibility and thermal characteristics before substituting.