LM431BCM

Voltage Reference Overview

The LM431BCM is a two-terminal adjustable precision Zener shunt regulator manufactured by National Semiconductor. It functions as a programmable voltage reference with an output voltage range spanning from 2.5 V to 36 V. The device incorporates a typical temperature coefficient of 50 ppm/°C over the operating temperature range and offers initial accuracy options of 1%, 2%, or 0.5%. It operates within a supply voltage range of 2.5 V to 36 V and supports a maximum shunt current of 100 mA. The component is housed in a SOT-23 surface-mount package.

Voltage Reference Feature Summary

• Provides precise adjustable voltage referencing via external resistor divider
• Ensures stable regulation across wide input voltage and temperature ranges
• Delivers high accuracy performance suitable for demanding analog circuits

Voltage Reference Applications

• Precision voltage references in measurement systems
• Programmable power supply feedback loops
• Battery management circuit monitoring

Voltage Reference Procurement Notes

Verify the specific suffix codes on the component marking to confirm the exact accuracy grade, as the base part number covers multiple tolerance variants. Ensure the ordering code matches the required initial accuracy specification for your design. Confirm that the package type aligns with your PCB footprint requirements before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a low-cost, high-accuracy shunt regulator is required for voltage reference applications. Consider the available accuracy grades and ensure the thermal performance meets the system's dissipation needs. Evaluate the package constraints against the board layout space available for surface-mount assembly.

Voltage Reference Part Context

This device belongs to the LM431 family of adjustable shunt regulators, widely used for providing stable reference voltages in various electronic circuits. It serves as a cost-effective alternative to fixed voltage references while offering greater flexibility through its adjustable output capability. The family is known for reliability in industrial and consumer electronics applications.

Voltage Reference Replacement Considerations

Compatible substitutes include the LM431ACZ and LM431BCZ from Texas Instruments, which share similar electrical characteristics and pin configurations. Verify that any replacement maintains the required accuracy grade and package dimensions to ensure seamless integration into existing designs.