LM431SACM32X

Voltage Reference Overview

The LM431SACM32X is a three-terminal programmable shunt regulator manufactured by Fairchild Semiconductor. It features an adjustable output voltage range from approximately 2.5V to 36V, set via two external resistors. The device offers a typical dynamic output impedance of 0.2Ω and a sink current capability between 1.0mA and 100mA. It exhibits a full-range temperature coefficient of 50ppm/°C and operates within a specified temperature range. The component provides thermal stability and fast turn-on response, serving as a precision alternative to Zener diodes in power management applications.

Voltage Reference Feature Summary

• Programmable output voltage adjustable between VREF and 36 volts using external resistors
• Low dynamic output impedance for stable regulation performance
• Active output circuit ensures sharp turn-on characteristics

Voltage Reference Applications

• Replacement for Zener diodes in voltage reference circuits
• Precision voltage references in power supply designs
• Voltage regulation in battery-powered equipment

Voltage Reference Procurement Notes

Verify the specific suffix 'CM32X' against official Fairchild or onsemi documentation, as standard datasheets typically list variants like LM431SAI or LM431SACMLX. Confirm RoHS compliance status and lead times directly with authorized distributors. Ensure the package type matches the SOT-23F-3 specification found in similar LM431SA series components before procurement.

Voltage Reference Selection Notes

Select this component when a low-cost, adjustable shunt regulator is required to replace fixed Zener diodes. It is suitable for applications needing a reference voltage between 2.5V and 36V with moderate accuracy. Consider the 50ppm/°C temperature coefficient for thermal stability requirements. Ensure the design can accommodate the necessary external feedback resistors to set the desired output voltage level.

Voltage Reference Part Context

The LM431 series is a widely used family of adjustable precision shunt regulators originally developed by National Semiconductor and later acquired by Fairchild Semiconductor, which was subsequently acquired by onsemi. These devices are standard components in power management IC portfolios, known for their reliability and ease of use in setting precise voltage thresholds through simple resistor networks.

Voltage Reference Replacement Considerations

Direct pin-compatible substitutes include LM431AIDR, LM431BIDR, and LM431CIMMX. Verify that replacement parts maintain the same SOT-23-3 package and electrical specifications, particularly the 100mA sink current limit and 37V maximum input voltage rating.