LM431BCM/NOPB

Voltage Reference Overview

The LM431BCM/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%. The device supports a maximum shunt current of 100 mA with a temperature coefficient of 97 ppm/°C. Designed for surface mount applications, it utilizes an SOIC-8 package. The component functions reliably across a temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides adjustable reference voltage functionality via external resistor divider
• Delivers high precision regulation with low temperature drift characteristics
• Supports direct replacement for standard Zener diodes in circuit designs

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators
• Over-voltage protection circuits

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free compliance and RoHS adherence as per manufacturer specifications. Confirm the SOIC-8 package variant matches the intended PCB footprint. Ensure the 2% accuracy grade meets the design requirements before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a stable, adjustable reference voltage is required in a surface-mount configuration. The 100 mA current capability allows for driving moderate loads directly. Consider the 97 ppm/°C temperature coefficient for thermal stability requirements in the target application environment.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable shunt regulators. It serves as a versatile alternative to fixed voltage references, offering flexibility through external programming resistors. The NOPB designation indicates environmental compliance, distinguishing it from older non-compliant variants within the same functional series.

Voltage Reference Replacement Considerations

LM431ACM/NOPB offers 1% accuracy. LM431CIM3/NOPB provides 0.5% accuracy in a SOT-23 package.