TL431ICT

Overview

The TL431ICT is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in a SOT-323-6 surface-mount package. It provides an adjustable output voltage range from 2.5 V to 36 V using two external resistors. The device operates with a cathode current range of 1 mA to 100 mA and features a typical dynamic impedance of 0.22 Ω. Initial accuracy options include 1% and 2%, while the temperature coefficient is specified at 100 PPM/°C. It supports an operating temperature range from -40°C to +125°C.

Feature Summary

• Adjustable output voltage capability between 2.5 V and 36 V via external resistor network
• Wide sink current operation ranging from 1 mA to 100 mA
• Guaranteed temperature stability across the full industrial and automotive operating range

Applications

• Precision voltage regulation in power supply circuits
• Reference voltage source for analog-to-digital converters
• Feedback control loops in switching regulators

Procurement Notes

Verify the specific suffix 'ICT' against the official STMicroelectronics datasheet to confirm package type and tape-and-reel specifications. Ensure the required initial accuracy (1% or 2%) matches the ordered variant. Confirm RoHS compliance status and check for any product change notifications that may affect pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a low-cost, adjustable precision reference is needed in a compact SOT-323-6 footprint. It is suitable for applications requiring stable reference voltages up to 36 V with moderate current sinking capabilities. Consider the 100 PPM/°C temperature coefficient for thermal stability requirements within the -40°C to +125°C range.

Part Context

The TL431 series represents a widely used family of programmable shunt voltage references. The TL431ICT variant specifically denotes the STMicroelectronics production in the SOT-323-6 package. This component serves as a fundamental building block for feedback networks in linear and switching power supplies, offering high stability and ease of use compared to discrete Zener diode solutions.

Replacement Considerations

Compatible alternatives include the TL1431 for extended temperature performance or the TS431 for low-voltage applications below 2.5 V. Verify pin compatibility and electrical parameters such as dynamic impedance and current range when substituting with other manufacturers' equivalents.