TL431TDA1

Overview

The TL431TDA1 is a precision programmable reference voltage regulator manufactured by Texas Instruments. It functions as a three-terminal shunt adjustable regulator with an output voltage range spanning from the internal reference threshold of approximately 2.495 V up to 36 V. The device utilizes two external resistors to set the desired output level. Key electrical characteristics include a typical output impedance of 0.2 Ω and a cathode current capability ranging from 1 mA to 100 mA. The component is designed for applications requiring stable voltage references in compact surface-mount configurations.

Feature Summary

• Provides precise programmable reference voltage functionality using a shunt regulator topology
• Features low output noise and well-defined turn-on characteristics suitable for replacing Zener diodes
• Offers high thermal stability across specified commercial, automotive, and military temperature ranges

Applications

• Board-level voltage regulation circuits
• Adjustable power supply designs
• Switching power supply feedback loops

Procurement Notes

Verify the specific package type and tape-and-reel specifications against the official datasheet before ordering. Confirm that the selected variant meets the required operating temperature range for your application environment. Ensure compatibility with existing PCB footprints and soldering profiles. Cross-reference part numbers carefully to distinguish between standard and automotive-grade versions if applicable.

Selection Notes

Select this component when a compact, precision adjustable shunt regulator is required for voltage referencing or regulation tasks. Consider the maximum cathode current limits and output voltage range relative to the circuit design requirements. Evaluate the thermal performance needs against the specified operating temperature range. Compare pinout and package dimensions with alternative packages like TO-92 or SOIC if space constraints differ.

Part Context

The TL431 series represents a widely used family of programmable shunt regulators known for their accuracy and versatility. The TL431TDA1 specifically denotes a surface-mount variant within this lineage, offering similar electrical performance to through-hole counterparts but optimized for automated assembly processes. This component serves as a fundamental building block in analog and mixed-signal power management designs.

Replacement Considerations

Direct substitutes may include other TL431 variants with compatible pinouts and electrical ratings. Verify that any replacement maintains the same output voltage range and current capabilities. Check for differences in package dimensions and thermal characteristics to ensure mechanical fit and adequate heat dissipation.