TL431AILPRA

Overview

The TL431AILPRA is a three-terminal programmable shunt regulator diode from onsemi. It operates as a low temperature coefficient zener, programmable from Vref to 36 V using two external resistors. The device features a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It offers a reference voltage tolerance of ±1% and an equivalent full-range temperature coefficient of 50 ppm/°C typical. Designed for operation over the -40°C to +85°C ambient temperature range, it provides stable precision referencing in compact TO-92 (TO-226) packages.

Feature Summary

• Programmable output voltage capability up to 36 V
• Low dynamic output impedance for stable regulation
• Temperature compensated for full rated operating range

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry

Procurement Notes

Verify the specific suffix 'A' indicates the 1% tolerance grade and 'LPRA' denotes the TO-92 package with tape and reel shipping configuration. Confirm that the component meets RoHS compliance standards as indicated by the manufacturer's documentation. Ensure the selected variant aligns with the required thermal management and lead forming specifications for the target PCB assembly process.

Selection Notes

Select this component when a precise, adjustable voltage reference is required within a shunt regulator topology. The 1% initial accuracy makes it suitable for applications demanding tighter tolerances than standard Zener diodes. Consider the TO-92 package constraints regarding power dissipation and mounting orientation. Evaluate stability requirements against load capacitance curves provided in the datasheet to ensure loop stability under varying operating conditions.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. It serves as a direct replacement for traditional Zener diodes in many analog and digital circuits. The family includes variants with different temperature grades and packaging options, such as SOIC-8 and Micro8, allowing designers to choose the most appropriate form factor for their specific space and thermal constraints.

Replacement Considerations

Direct substitutes include other TL431 series parts with matching tolerance and package codes, such as TL431AILPRAG.