TL431ACL5T

Overview

The TL431ACL5T is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in a SOT-23-5 surface-mount package. It provides an output voltage range from 2.5 V to 36 V, set via two external resistors. The device features a typical dynamic impedance of 0.22 Ω and operates with a cathode current range of 1 mA to 100 mA. Initial accuracy is specified at ±1.0%, with a temperature coefficient of 100 ppm/°C. It supports operating temperatures from -40°C to +125°C.

Feature Summary

• Adjustable output voltage capability between 2.5 V and 36 V using external resistors
• Guaranteed temperature stability across the entire operating temperature range
• Wide cathode current operation range supporting sink currents from 1 mA to 100 mA

Applications

• Precision voltage regulation circuits
• Programmable power supplies
• Linear regulator feedback loops

Procurement Notes

Verify the specific suffix 'ACL5T' against official STMicroelectronics documentation to confirm pinout compatibility and tolerance grades. Ensure the ordering code matches the required SOT-23-5 package variant. Cross-reference datasheet revisions for any changes in electrical characteristics or recommended operating conditions before finalizing procurement specifications.

Selection Notes

Select this component when a compact surface-mount solution is required for precise voltage referencing. The ±1.0% initial accuracy suits applications demanding tighter tolerances than standard versions. Verify that the 36 V maximum input voltage aligns with the circuit's supply rails and that the thermal performance meets the system's requirements within the specified temperature range.

Part Context

This part belongs to the TL431 family of programmable shunt voltage references. It serves as a low-cost alternative to Zener diodes, offering superior performance in terms of temperature stability and dynamic impedance. The device is widely used in industrial and consumer electronics where reliable voltage regulation is critical.

Replacement Considerations

Compatible substitutes include the TL431ACLP (TO-92 package) and TL431AIDBZR (SOT-23-3 package). Verify pinout differences and package dimensions before substitution. Other manufacturers offer equivalent parts such as the LM431, but electrical parameters must be compared against the original datasheet.