SPX431LCN/TR

Overview

The SPX431LCN/TR is a precision adjustable shunt regulator manufactured by Sipex, now part of MaxLinear. It operates within an output voltage range of 2.493 V to 36 V and features an initial accuracy of 0.5%. The device supports a maximum shunt current of 150 mA with a minimum operating current of 1 mA. It exhibits a temperature coefficient of 30 PPM/°C and functions across a wide temperature range from -40°C to +125°C. The component utilizes SOT-89-3 surface-mount packaging and draws a typical operating supply current of 10 mA.

Feature Summary

• Provides precise adjustable voltage regulation suitable for high-stability applications
• Capable of handling significant load currents up to 150 mA
• Designed for robust performance across extended industrial temperature ranges

Applications

• Precision voltage reference circuits
• Programmable power supplies
• Battery-operated equipment requiring stable references

Procurement Notes

Verify the specific manufacturer source, as this component may be sourced from Sipex, Exar, or MaxLinear depending on inventory age. Confirm package integrity and moisture sensitivity levels prior to assembly. Check for End-of-Life status or alternative sourcing requirements through authorized distributors to ensure long-term supply chain stability.

Selection Notes

Select this component when a low-cost, high-accuracy shunt regulator is required for voltage referencing. Ensure the design accommodates the 1 mA minimum cathode current for proper regulation. Verify that the thermal dissipation capabilities of the SOT-89-3 package align with the expected power loss under maximum load conditions.

Part Context

This part belongs to the SPX431 series of precision adjustable shunt regulators originally developed by Sipex. Following corporate acquisitions, the product line is managed under MaxLinear. These devices are widely recognized in the industry for replacing standard Zener diodes in applications demanding superior voltage stability and lower temperature drift characteristics.

Replacement Considerations

Direct replacements include the SPX431AM1-L/TR and generic equivalents like the TL431 family, provided pin compatibility and electrical specifications such as initial accuracy and temperature coefficient meet the original design constraints.