TL431AIYDT

Overview

The TL431AIYDT is an adjustable shunt voltage reference from STMicroelectronics, part of the TL431 series. It provides a reference voltage with ±1% initial accuracy and operates within a supply voltage range of 2.5 V to 36 V. The device supports a cathode current range from 700 µA to 100 mA and features a typical dynamic impedance of 0.22 Ω. It is qualified under AEC-Q100 standards for automotive applications and functions reliably across an extended temperature range of -40°C to +125°C. The component is housed in an 8-SOIC surface-mount package.

Feature Summary

• Adjustable output voltage capability between 2.5 V and 36 V using external resistors
• Automotive-grade qualification ensuring stability across wide temperature variations
• High precision with ±1% initial accuracy for reliable reference performance
• Wide operating current range supporting diverse circuit load requirements

Applications

• Precision power supply regulation circuits
• Programmable linear regulators
• DC-to-DC converter feedback loops
• Portable equipment voltage monitoring

Procurement Notes

Verify the specific suffix 'Y' against official STMicroelectronics documentation to confirm packaging details such as reel size or tape specifications. Ensure the selected variant matches the required thermal and electrical parameters for the target application environment. Cross-reference the datasheet revision history to confirm compliance with current RoHS and REACH directives before finalizing procurement orders.

Selection Notes

Select this component when high precision and automotive reliability are required for shunt regulation. The 8-SOIC package suits surface-mount designs needing compact footprints. Consider the ±1% tolerance and extended temperature range for harsh environments. Verify that the 100 mA sink current meets the circuit's maximum load demands without exceeding thermal limits.

Part Context

The TL431AIYDT belongs to the widely adopted TL431 family of programmable zener diodes. This series serves as a standard solution for voltage referencing in industrial and automotive electronics. The AI designation indicates the specific accuracy grade and temperature range, while the YDT suffix defines the surface-mount packaging configuration used for automated assembly processes.

Replacement Considerations

Compatible substitutes include the TL431BIDT for tighter tolerance requirements and the TS431 for low-voltage applications below 2.5 V. Other equivalents like the LM431 or REF33xx may be considered if pin compatibility and electrical characteristics align with the design constraints.