TS431AILT

Overview

The TS431AILT is a low-voltage, three-terminal adjustable shunt voltage reference manufactured by STMicroelectronics. It operates within an output voltage range of 1.24 V to 6 V and supports a cathode current range from 60 µA to 30 mA. The device features an initial accuracy of 1% and a temperature coefficient of 100 ppm/°C. It is housed in a surface-mount SOT-23-5 package and is qualified for automotive applications under the AEC-Q100 standard.

Feature Summary

• Adjustable output voltage set between 1.24 V and 6 V using two external resistors
• Operates at lower voltage and cathode current compared to TL431 and TL1431 references
• Typically stable with any capacitive loads due to low output impedance
• Includes 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 reference circuits requiring low voltage operation
• Automotive electronic systems requiring AEC-Q100 qualification

Procurement Notes

Verify that the specific order code matches the required tolerance and package variant. Confirm AEC-Q100 automotive qualification status if the application demands it. Ensure the SOT-23-5 footprint aligns with the PCB design. Check datasheet specifications for thermal management requirements during operation.

Selection Notes

Select this component when a low-voltage adjustable shunt reference is needed with high precision. It is suitable for designs requiring operation below standard 2.5 V references. Consider the 1% initial accuracy and 100 ppm/°C temperature coefficient for stability needs. Verify compatibility with existing optocoupler drive circuits for power supply regulation.

Part Context

The TS431 series serves as a low-voltage alternative to widely used TL431 and TL1431 shunt voltage references. It allows operation at lower voltages and currents. The TS431AILT specifically denotes the 1% accuracy grade within the SOT-23-5 surface mount package family.

Replacement Considerations

Compatible with TL431 and TL1431 devices where lower operating voltage or current is beneficial. Verify pinout compatibility and electrical parameters before substitution.