TL431AILPRE3

Overview

The TL431AILPRE3 is a three-terminal adjustable shunt voltage reference from Texas Instruments, housed in a TO-92-3 through-hole package. It provides an adjustable output voltage ranging from 2.495 V to 36 V using two external resistors. The device features an initial accuracy of ±1% and operates within a temperature range of -40°C to 85°C. Key electrical specifications include a maximum output current of 100 mA, a typical output impedance of 0.2 Ω, and a maximum input voltage of 37 V.

Feature Summary

• Provides precise programmable shunt regulation with low output noise
• Features explicit turn-on characteristics suitable for replacing Zener diodes
• Offers high thermal stability across commercial and automotive temperature ranges

Applications

• Board-level voltage regulation
• Adjustable power supply circuits
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix 'E3' indicates RoHS compliance and lead-free construction as per manufacturer documentation. Confirm the package type matches the required TO-92-3 form factor for your PCB layout. Check for any recent Product Change Notifications (PCN) regarding assembly materials or design changes that may affect long-term availability or pin compatibility.

Selection Notes

Select this component when a precision adjustable reference is needed in a through-hole configuration. The ±1% tolerance suits applications requiring tighter accuracy than standard grades. Ensure the circuit design supports the minimum cathode current requirement for stable regulation. Consider the thermal performance if operating near the upper temperature limit.

Part Context

This part belongs to the TL431 family of adjustable shunt regulators, widely used as a precision reference element. It serves as a direct replacement for fixed Zener diodes in many linear and switching regulator topologies. The TO-92 package offers a compact solution for prototyping and low-volume production where surface-mount options are not preferred.

Replacement Considerations

The TL431AIDBZR is listed as a recommended alternative by the manufacturer, though it utilizes a different SOT-23-3 surface-mount package. Verify pinout compatibility and thermal dissipation requirements before substituting. Other variants like TL431AILP share similar electrical characteristics but differ in packaging.