TL431AILPR

Overview

The TL431AILPR is a programmable shunt voltage reference from Texas Instruments, part of the TL431 series. It operates within an output voltage range of 2.495V to 36V and supports a maximum cathode current of 100mA. The device features an initial accuracy of ±1% and a temperature coefficient of 92 ppm/°C. It is housed in a TO-92-3 (TO-226AA) package with through-hole mounting capabilities. The component functions as an adjustable precision reference, suitable for applications requiring stable voltage regulation across a wide operating temperature range.

Feature Summary

• Provides precise adjustable voltage referencing via a three-terminal shunt topology
• Ensures high stability with low temperature drift characteristics
• Supports robust cathode current handling for effective circuit regulation

Applications

• Precision power supply voltage regulation
• On-line isolated DC-to-DC converters
• Battery-operated equipment monitoring circuits

Procurement Notes

Verify the specific suffix 'A' indicates the ±1% accuracy grade and 'LPR' denotes the tape-and-reel packaging format. Confirm that the TO-92-3 package matches your board layout requirements. Ensure the supplier provides documentation confirming RoHS compliance and material declarations. Cross-reference the manufacturer's latest datasheet for any potential design changes or obsolescence notices before finalizing procurement.

Selection Notes

Select this component when a low-cost, high-accuracy adjustable reference is required in a through-hole package. The ±1% tolerance makes it suitable for applications demanding tighter voltage control than standard references. Consider the 100mA current capability for driving feedback loops or loading conditions. Evaluate the thermal performance within the TO-92 package against the expected ambient temperature conditions.

Part Context

The TL431 family serves as a widely adopted industry-standard adjustable shunt regulator. The TL431AILPR specifically offers improved accuracy compared to lower-grade variants. It is commonly used in conjunction with optocouplers for feedback isolation in switching power supplies. The device replaces older Zener diode solutions by providing superior temperature stability and dynamic impedance characteristics.

Replacement Considerations

Direct pin-compatible substitutes include the TL431ACLP and TL431ACLPR. Verify that alternative parts maintain the same ±1% accuracy grade and TO-92 package dimensions. Ensure the replacement supports the required 36V maximum input voltage and 100mA current rating.