LX432CSE

Overview

The LX432CSE is a low-voltage adjustable precision shunt regulator manufactured by Microsemi. It features a 1.24V internal reference voltage and an operating current as low as 80µA, making it suitable for micropower applications. The device offers an initial voltage reference accuracy of 1% and a typical output dynamic impedance below 250mΩ. It operates within a temperature range of 0°C to 70°C and is housed in a 5-pin SOT-23 package.

Feature Summary

• Adjustable output voltage capability from the reference level up to 20V using external resistors
• Low power consumption with minimum cathode current requirement of 80µA for regulation
• High precision performance characterized by 1% initial voltage reference accuracy
• Low output impedance ensuring improved load regulation stability

Applications

• Low voltage adjustable power supplies
• Feedback loops in isolated power supplies
• Portable equipment and micropower systems
• Instrumentation circuits

Procurement Notes

Verify that the specific part number matches the required commercial temperature grade (0°C to 70°C) and the 5-pin SOT-23 package configuration. Confirm compliance with RoHS standards if applicable to the manufacturing batch. Ensure the ordering suffix aligns with the desired tape and reel packaging option if high-volume assembly is planned.

Selection Notes

Select this component when a precise, low-cost shunt regulator is needed for feedback control in low-voltage environments. Consider the 80µA minimum operating current to ensure stable regulation under light load conditions. Verify that the thermal resistance characteristics of the SOT-23 package are sufficient for the expected power dissipation in the target application.

Part Context

This device belongs to the LX432 series of low-voltage adjustable precision shunt regulators produced by Microsemi's Linfinity Microelectronics Division. It serves as a direct alternative to the TLV431 and SC431L devices, offering similar functionality in a compact plastic surface-mount package designed for space-constrained electronic designs.

Replacement Considerations

The datasheet identifies the TLV431 and SC431L as direct alternatives. Verify pinout compatibility and electrical specifications before substituting these parts in existing designs.