LM431ACM

Voltage Reference Overview

The LM431ACM is a programmable shunt voltage reference manufactured by onsemi. It operates within an output voltage range of 2.495 V to 37 V and provides an initial accuracy of 2%. The device supports a maximum shunt current of 100 mA and maintains operation across a temperature range from -40 °C to +85 °C. It utilizes a SOIC-8 surface-mount package.

Voltage Reference Feature Summary

• Provides adjustable output voltage via external resistor divider
• Features low dynamic output impedance for stable regulation
• Includes internal temperature compensation for stability

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators
• Voltage monitoring systems

Voltage Reference Procurement Notes

Verify the manufacturer designation, as Texas Instruments also produces this part number. Confirm the suffix 'A' indicates the specified 2% accuracy grade. Ensure the package matches the required SOIC-8 footprint and verify RoHS compliance status before procurement.

Voltage Reference Selection Notes

Select this component when a 2.495 V to 37 V adjustable range is required with 2% initial accuracy. Consider the 100 mA maximum shunt current limit for load requirements. Verify that the operating temperature range meets the application's environmental conditions.

Voltage Reference Part Context

This component belongs to the LM431 family of three-terminal shunt regulators. These devices function as adjustable Zener diodes, offering superior performance over standard fixed references. The LM431ACM variant specifically denotes the 2% accuracy grade within this series.

Voltage Reference Replacement Considerations

LM431ACMX/NOPB (Texas Instruments equivalent)

Voltage Reference FAQ

What determines the output voltage?

The output voltage is determined by two external resistors forming a voltage divider connected to the reference pin.

What is the minimum operating voltage?

The minimum regulated output voltage is 2.495 V.