TL1431CKTPR

Overview

The TL1431CKTPR is a precision programmable shunt voltage reference manufactured by Texas Instruments. It provides an adjustable output voltage ranging from approximately 2.5 V to 36 V, set via two external resistors. The device features a typical output impedance of 0.2 Ω and supports a sink current capability between 1 mA and 100 mA. It includes fast turn-on characteristics with a time of 500 ns and low reference input current. The component is designed for specified thermal stability across commercial, automotive, and military temperature ranges.

Feature Summary

• Adjustable output voltage range from the internal reference level up to 36 V using external resistors
• Fast turn-on characteristic suitable for clamp applications
• Low reference input current requirement
• Typical output impedance of 0.2 Ω

Applications

• Secondary side regulation in flyback switching power supplies
• Adjustable voltage and current referencing circuits
• Zener diode replacement
• Voltage monitoring systems
• Comparators with integrated reference

Procurement Notes

Verify that the specific suffix CKTPR corresponds to the intended package type and tape-and-reel configuration as defined in the manufacturer's orderable addendum. Confirm the required temperature grade (C, Q, or M) matches the application environment, as performance specifications vary significantly between commercial, automotive, and military variants within the TL1431 family.

Selection Notes

Select this component when a precision shunt regulator with high gain and fast response is required. Ensure the cathode current remains within the 1 mA to 100 mA operating range to maintain regulation. Consider the stability boundary conditions if significant capacitive loads are present at the cathode. Verify that the initial voltage tolerance meets the system accuracy requirements.

Part Context

The TL1431 series serves as a versatile analog building block combining an accurate voltage reference with an operational amplifier. It functions as a single voltage reference, error amplifier, or comparator. The device is widely used in industrial, automotive, telecom, and computing equipment due to its ability to operate over wide temperature ranges and its compatibility with standard feedback configurations.

Replacement Considerations

Direct substitutes include other parts within the TL1431 family such as TL1431C, TL1431Q, or TL1431M, depending on the required temperature range. Alternative packages like SOIC-8 or TO-92 may be selected if pinout compatibility allows.