TL431AID

Overview

The TL431AID is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in an 8-pin SOIC surface-mount package. It provides a nominal reference voltage of 2.5 V with an initial accuracy of ±1%. The device supports an output voltage range from 2.47 V to 36 V and operates within a temperature range of -40°C to +105°C. Key electrical specifications include a maximum sink current of 100 mA, a minimum cathode current of 700 µA, and a typical dynamic impedance of 0.22 Ω. It is AEC-Q100 qualified for automotive applications.

Feature Summary

• Adjustable output voltage capability ranging from 2.5 V to 36 V using two external resistors
• Guaranteed temperature stability over the entire operating temperature range
• High sink current capability supporting operation from 1 mA to 100 mA
• Low typical dynamic output impedance for stable regulation

Applications

• Precision voltage references in power supply circuits
• On-line isolated DC/DC converters
• Programmable output regulators
• Battery chargers and management systems

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm package type and precision grade. Ensure the ordered component matches the required thermal performance and automotive qualification standards. Cross-reference datasheet revisions to confirm pinout compatibility and electrical characteristics before integration into final designs.

Selection Notes

Select this component when a precise, adjustable shunt reference is required in surface-mount designs. The ±1% tolerance suits applications demanding higher accuracy than standard 2% variants. Consider the 8-SOIC package dimensions for PCB layout constraints. Verify that the operating current requirements fall within the 1 mA to 100 mA operational window for optimal performance.

Part Context

The TL431 series represents a widely used family of programmable shunt voltage references. The TL431AID variant specifically denotes the adjustable version with 1% initial accuracy in an SOIC-8 package. It serves as a cost-effective alternative to Zener diodes, offering superior temperature stability and lower dynamic impedance for feedback loop control in switching power supplies.

Replacement Considerations

Direct replacements include other manufacturers' TL431AID equivalents or compatible parts like the LM431AIMX/NOPB. Ensure substitute components match the 8-SOIC package, ±1% accuracy, and AEC-Q100 qualification if automotive reliability is required. Verify pinout compatibility and thermal specifications before substitution.