TL431CP-J

Overview

The TL431CP-J is a three-terminal adjustable shunt regulator manufactured by Texas Instruments. It provides a specified thermal stability over applicable temperature ranges, making it suitable for automotive, commercial, and military applications. The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors. This device features low output noise and a typical output impedance of 0.2Ω. It serves as an excellent replacement for Zener diodes in board-level regulation, adjustable power supplies, and switching power supplies.

Feature Summary

• Three-terminal adjustable shunt regulator with specified thermal stability
• Wide adjustable output voltage range from approximately 2.5V to 36V
• Low output noise and typical 0.2Ω output impedance
• Capable of sinking current from 1mA to 100mA

Applications

• Board-level regulation
• Adjustable power supplies
• Switching power supplies

Procurement Notes

Verify the specific suffix 'J' against the official Texas Instruments datasheet to confirm pinout, accuracy grade, and package variations. Ensure the component meets the required operating temperature range for the target application. Cross-reference the manufacturer part number with authorized distributors to confirm current availability and authenticity before procurement.

Selection Notes

Select this component when a precise, adjustable reference voltage is needed in a compact three-terminal package. Consider the 0.2Ω typical output impedance for stability requirements. Verify that the 1mA to 100mA sink current capability aligns with the circuit design. Check if the specified thermal stability meets the environmental conditions of the final assembly.

Part Context

The TL431 series is a widely used family of programmable shunt regulators. The TL431CP-J variant specifically denotes a particular accuracy grade and package configuration within this lineage. It is designed to replace traditional Zener diodes, offering superior precision and temperature stability. The device is integral to feedback loops in power management circuits requiring accurate voltage referencing.

Replacement Considerations

Check for direct replacements like TL431ACLP or TL431AILP depending on required accuracy and package. Ensure substitute parts maintain the same 36V maximum input voltage and adjustable output range. Verify compatibility with existing PCB footprints and thermal management requirements.