TL431ACPS

Overview

The TL431ACPS is a three-terminal adjustable shunt regulator from Texas Instruments, part of the TL431 series. It provides an adjustable output voltage ranging from 2.495V to 36V using two external resistors. The device features an initial accuracy of ±1% and operates within a temperature range of 0°C to 70°C. It supports a maximum cathode current of 100mA with a minimum operating current of 600µA. The component utilizes a SOT-23 surface-mount package with three pins.

Feature Summary

• Adjustable precision shunt regulation with output voltage settable between Vref and 36V
• High initial accuracy of ±1% for precise reference applications
• Stable operation with capacitive loads in switching power supply topologies

Applications

• Onboard regulation circuits
• Adjustable power supplies
• Switching power supplies
• Voltage monitoring and comparator functions

Procurement Notes

Verify the specific suffix 'PS' against official Texas Instruments documentation to confirm the exact package type and tape-and-reel specifications. Ensure the selected variant matches the required thermal performance and pinout configuration for the target PCB layout. Cross-reference datasheets to confirm active status and compliance standards.

Selection Notes

Select this component when a low-cost, high-accuracy adjustable reference is required for shunt regulation. Consider the ±1% tolerance and 100mA current capability for feedback loops in isolated converters. Verify that the SOT-23 package dimensions fit the design constraints and that the operating temperature range meets the environmental requirements.

Part Context

The TL431ACPS belongs to the widely used TL431 family of programmable shunt regulators. These devices serve as versatile alternatives to Zener diodes, offering superior stability and adjustability. The family is standard in power management designs for error amplification and voltage referencing across various industrial and consumer electronics applications.

Replacement Considerations

Direct replacements include other TL431 variants such as TL431ACDBZR or TL431ACLPR, provided they match the SOT-23 package and ±1% accuracy grade. Ensure substitute parts maintain the same electrical characteristics and pin compatibility.