TL431AILP

Overview

The TL431AILP is a three-terminal adjustable shunt regulator from the TL431 series, manufactured by Toshiba Semiconductor and Storage. It provides a programmable output voltage ranging from approximately 2.5 V to 36 V, set via 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 parameters include a maximum input voltage of 37 V, a minimum operating voltage of 2.47 V, and a sink current capability of up to 100 mA. It utilizes a TO-92 through-hole package with three pins.

Feature Summary

• Programmable output voltage adjustable between 2.5 V and 36 V using external resistors
• High precision with ±1% initial accuracy for stable reference performance
• Low dynamic output impedance ensuring consistent regulation under varying loads

Applications

• Shunt regulators in power supply circuits
• Precision constant current sinks
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify the manufacturer designation on the component marking to confirm it originates from Toshiba Semiconductor and Storage rather than other vendors producing equivalent TL431 devices. Ensure the specific suffix matches the required tolerance grade and package type for your design specifications.

Selection Notes

Select this component when a high-precision, low-cost adjustable reference is required for through-hole designs. The ±1% tolerance makes it suitable for applications demanding tighter voltage control compared to standard grades. Consider the thermal characteristics and package constraints during PCB layout planning.

Part Context

This part belongs to the widely adopted TL431 family of programmable precision references. These devices are industry-standard replacements for Zener diodes, offering superior temperature stability and lower dynamic impedance. The TL431AILP specifically denotes the A-grade accuracy variant in a TO-92 package.

Replacement Considerations

Compatible substitutes include TL431AIP (Texas Instruments) and SC431ILPRAG (onsemi). Verify pinout compatibility and ensure the replacement meets the same ±1% accuracy and temperature range requirements.