TS431AIYLT

Overview

The TS431AIYLT is an automotive-grade, adjustable shunt voltage reference IC manufactured by STMicroelectronics. It operates within a cathode current range of 60 µA to 30 mA and supports output voltages from 1.24 V to 6 V. The device features 1% initial accuracy and a temperature coefficient of 100 ppm/°C. It is qualified under AEC-Q100 standards for automotive applications and functions across a temperature range of -40°C to +125°C. Packaged in a surface-mount SOT-23-5 format with tape and reel delivery, it serves as a low-voltage alternative to standard TL431 references.

Feature Summary

• AEC-Q100 qualified for automotive reliability requirements
• Adjustable output voltage programmable between 1.24 V and 6 V using external resistors
• Low output impedance typically stable for any capacitive loads
• ESD protection rated at 2 kV human body model and 200 V machine model

Applications

• Regulating 3.3 V switching power supplies when driving optocouplers
• Precision voltage referencing in automotive electronic control units
• Low-voltage power management circuits requiring high stability

Procurement Notes

Verify the specific suffix 'AIYLT' against official STMicroelectronics documentation to confirm the exact pinout, tolerance class, and packaging configuration. Ensure the component meets AEC-Q100 automotive qualification requirements for the intended application environment. Cross-reference datasheet revisions to validate electrical parameters such as initial accuracy and temperature coefficients before finalizing procurement specifications.

Selection Notes

Select this component when automotive qualification (AEC-Q100) is mandatory for the design. Choose TS431AIYLT over standard TL431 variants if lower operating voltage or reduced cathode current consumption is required. The SOT-23-5 package is suitable for space-constrained surface-mount designs. Verify that the 1% initial accuracy and 100 ppm/°C temperature coefficient meet the system's precision requirements.

Part Context

The TS431 series represents a family of low-voltage, three-terminal adjustable shunt voltage references. The TS431AIYLT specifically denotes the automotive-grade variant with 1% accuracy in an SOT-23-5 package. This series offers improved performance over legacy TL431 devices by enabling operation at lower voltages and currents, making it ideal for modern efficient power supply architectures.

Replacement Considerations

Direct substitutes include other TS431 variants with compatible packages and accuracies, such as TS431BIYLT for 0.5% accuracy or TS431AILT for non-automotive use. Standard TL431 devices may function electrically but lack the specific automotive qualification and low-voltage optimization of the TS431 series.