LM431SACMFX_G

Voltage Reference Overview

The LM431SACMFX is a programmable shunt voltage reference manufactured by onsemi. It operates within an input voltage range of up to 37 V and provides an adjustable output voltage from 2.5 V to 36 V. The device features an initial accuracy of 2% and a temperature coefficient of 50 PPM/°C. It supports a maximum shunt current of 100 mA with a minimum operating current of 1 mA. The component is housed in a SOT-23F-3 surface-mount package and functions across a temperature range of -25°C to +85°C.

Voltage Reference Feature Summary

• Provides precise programmable shunt regulation for stable voltage references
• Offers high initial accuracy with low temperature drift characteristics
• Designed for compact surface-mount integration in power management circuits

Voltage Reference Applications

• Precision voltage reference sources in power supply designs
• Programmable output control in switching regulators
• Voltage monitoring and threshold detection circuits

Voltage Reference Procurement Notes

Verify the specific suffix designation against official manufacturer documentation, as the provided model includes a trailing underscore and G which may indicate specific packaging or revision variants not explicitly detailed in standard datasheets. Confirm end-of-life status and obsolescence notices prior to procurement, as this component family has been subject to discontinuation notices. Ensure compatibility with required RoHS compliance standards for the intended application environment.

Voltage Reference Selection Notes

Select this component when a compact, adjustable shunt regulator is required with moderate precision requirements. The SOT-23F-3 package suits space-constrained designs. Evaluate the 2% initial accuracy and 50 PPM/°C temperature coefficient against system tolerance needs. Consider the 100 mA current handling capability for load regulation requirements. Verify that the -25°C to +85°C operating range meets environmental specifications.

Voltage Reference Part Context

This part belongs to the LM431SA series of programmable shunt regulators from onsemi. It serves as a direct replacement for legacy TL431-type devices in many applications, offering improved performance in a smaller footprint. The series is widely used in industrial and consumer electronics for voltage referencing and feedback control loops.

Voltage Reference Replacement Considerations

Publicly confirmed substitute part numbers include NCP431AISNT1G and AP431SBN1TR-G1. Verify pinout compatibility and electrical parameter alignment before substitution.