TS431IYLT

Overview

The TS431IYLT is an automotive-grade, low-voltage adjustable shunt voltage reference manufactured by STMicroelectronics. It operates within a voltage range of 1.24 V to 6 V and supports cathode currents from 60 µA to 30 mA. The device features 1% initial accuracy and a temperature coefficient of 100 ppm/°C. Packaged in a surface-mount SOT-23-5 format, it is AEC-Q100 qualified for automotive applications. The component exhibits low output impedance (0.2 Ω) and high ESD protection ratings (HBM 2 kV, MM 200 V), ensuring stability with capacitive loads.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards
• Adjustable output voltage programmable between 1.24 V and 6 V
• High electrostatic discharge robustness for sensitive environments
• Capable of driving optocouplers for power supply regulation

Applications

• Regulating 3.3 V switching power supplies
• Driving optocouplers in feedback loops
• Replacing TL431 and TL1431 references in automotive designs

Procurement Notes

Verify the specific suffix 'I' confirms the 1% precision grade and automotive status. Confirm the 'YL' package code matches the required SOT-23-5 footprint. Ensure the 'T' indicates tape and reel packaging suitable for automated assembly. Cross-reference the manufacturer part number against official ST databases to validate authenticity and current production status before finalizing procurement.

Selection Notes

Select this component when designing automotive circuits requiring precise voltage referencing at lower operating voltages than standard TL431 devices. It is suitable for applications demanding high reliability under thermal stress and strict space constraints due to its compact SOT-23-5 package. Consider its wide cathode current range for efficient optocoupler drive capabilities in isolated power conversion topologies.

Part Context

The TS431 series represents STMicroelectronics' evolution of the industry-standard shunt reference, optimized for automotive durability. Unlike general-purpose counterparts, the TS431IYLT is engineered to operate reliably across the extended temperature ranges and vibration profiles typical of vehicle electronics. It serves as a direct functional upgrade for legacy TL431 implementations where higher precision and automotive compliance are mandatory.

Replacement Considerations

The TS431IYLT is designed as a drop-in replacement for TL431 and TL1431 devices in existing schematics. Verify that the host circuit's cathode current limits remain within the 60 µA to 30 mA operational window. Ensure compatibility with the 1.24 V internal reference threshold if the application relies on minimum voltage operation.