SPX431LM-L

Overview

The SPX431LM-L is a precision adjustable shunt voltage regulator manufactured by MaxLinear (formerly Sipex). It provides a highly accurate bandgap reference with an initial accuracy of 1% and a temperature coefficient of 30 PPM/C. The device operates within a supply voltage range up to 2.52 V maximum for the reference node, though the output can be adjusted from 2.49 V to 20 V using external resistors. It supports a maximum shunt current of 100 mA and a minimum operating current of 1 mA. The component is housed in an SOT-89 package and functions within a temperature range of 0°C to +105°C.

Feature Summary

• Provides a stable, high-accuracy bandgap reference voltage source
• Allows output voltage adjustment via two external resistors
• Operates as a three-terminal shunt regulator

Applications

• Precision voltage references in power management circuits
• Error amplifier references in switching regulators
• Comparator threshold setting

Procurement Notes

Verify manufacturer status carefully as this component is listed as obsolete or end-of-life by major distributors such as Mouser. Confirm availability through secondary market channels or authorized surplus dealers. Ensure the specific lot date code meets project requirements due to potential age-related reliability concerns. Cross-reference datasheets from MaxLinear and legacy Sipex documentation to confirm pinout and electrical specifications match design needs.

Selection Notes

Select this component when a low-cost, adjustable shunt regulator with moderate precision is required. Consider the SOT-89 package constraints for thermal dissipation given the 100 mA maximum shunt current capability. Evaluate the 1% initial accuracy against application tolerance requirements. Verify that the 30 PPM/C temperature coefficient is sufficient for the operating environment. Check for moisture sensitivity handling requirements during assembly.

Part Context

This part belongs to the SPX431L series of adjustable shunt regulators. Originally developed by Sipex, the product line was acquired by MaxLinear. The series includes variants with different packaging options such as SOT-23 and SOT-89. These devices are commonly used as replacement components for standard Zener diodes in voltage regulation applications where better stability and lower impedance are needed.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided data.