LM431SCCM32X

Voltage Reference Overview

The LM431SCCM32X is a three-terminal programmable shunt regulator manufactured by onsemi. It features an adjustable output voltage range from approximately 2.5 V to 36 V, set via two external resistors. The device offers a typical dynamic output impedance of 0.2 Ω and supports a sink current capability between 1.0 mA and 100 mA. It includes temperature compensation for operation over the full rated operating temperature range, with a typical equivalent full-range temperature coefficient of 50 ppm/°C. The component utilizes an active output circuit providing a sharp turn-on characteristic.

Voltage Reference Feature Summary

• Programmable output voltage adjustable between VREF (approx. 2.5 V) and 36 V using external resistors
• Low dynamic output impedance with a typical value of 0.2 Ω
• Temperature compensated for stable operation across the full rated operating temperature range
• Active output circuit provides fast turn-on response and low output noise voltage

Voltage Reference Applications

• Shunt regulator circuits
• Output control for three-terminal fixed regulators
• High current shunt regulator configurations
• Current limit or current source applications
• Constant-current sink implementations

Voltage Reference Procurement Notes

Verify the specific suffix M32 corresponds to the SOT-23 package variant as defined in the ordering information table. Confirm that the device status is current, as the datasheet indicates certain LM431S variants are discontinued. Ensure compliance with RoHS and Halogen-free requirements if specified for the application environment. Cross-reference the marking code '43J' for identification purposes during assembly.

Voltage Reference Selection Notes

Select this component when a precise, adjustable reference voltage is required within the 2.5 V to 36 V range. Consider the 0.2 Ω dynamic impedance for stability in feedback loops. Evaluate the thermal resistance of the SOT-23 package against the expected power dissipation at maximum cathode current. Verify that the minimum cathode current requirement of 1.0 mA can be met by the load conditions to ensure proper regulation.

Voltage Reference Part Context

This part belongs to the LM431SA/SB/SC family of programmable shunt regulators. The 'SC' designation indicates a 0.5% initial accuracy tolerance for the reference input voltage. The 'M32' suffix identifies the specific SOT-23 surface-mount package configuration. These devices serve as direct replacements for Zener diodes in many precision regulation applications due to their superior temperature stability and adjustability.

Voltage Reference Replacement Considerations

LM431SCCMLX

Voltage Reference FAQ

What is the function of the active output circuit in the LM431SCCM32X?

The active output circuit provides a sharp turn-on characteristic and low output noise voltage, making the device suitable for replacing Zener diodes in precision applications.

How is the output voltage of the LM431SCCM32X determined?

The output voltage is programmable and can be set to any value between VREF (approximately 2.5 V) and 36 V using two external resistors connected to the reference pin.