TL431QPK

Overview

The TL431QPK is a three-terminal adjustable shunt regulator manufactured by Texas Instruments, designed for automotive applications. It operates within an extended temperature range of -40°C to 125°C and utilizes a SOT-89-3 surface-mount package. The device provides a reference voltage starting at 2.495V, with an adjustable output capability extending up to 36V. It features a typical output impedance of 0.2 Ω and supports cathode currents ranging from 1 mA to 100 mA. The component meets RoHS3 standards and carries a Moisture Sensitivity Level (MSL) rating of 2.

Feature Summary

• Automotive-grade thermal stability specified for operation across wide temperature extremes
• Adjustable output voltage configuration via external resistors
• Low output noise characteristics suitable for precision regulation
• Defined initial accuracy tolerance for consistent performance

Applications

• Board-level voltage regulation in automotive electronics
• Switching power supply feedback loops
• Portable equipment power management
• DC/DC converter reference sources

Procurement Notes

Verify the specific suffix designation against the manufacturer's current datasheet to confirm exact tolerance grades and packaging options. Ensure compatibility with automotive qualification standards required for the target application environment. Cross-reference the part number with official Texas Instruments documentation to validate current production status and any recent design changes or obsolescence notices.

Selection Notes

Select this component when automotive reliability and wide temperature operation are mandatory requirements. The SOT-89-3 package offers a compact footprint suitable for space-constrained designs. Consider the specific accuracy grade needed for the circuit's reference stability. Evaluate the cathode current requirements to ensure the device can handle the maximum load current without exceeding its operational limits.

Part Context

This device belongs to the TL431 family of programmable shunt regulators. It serves as a high-performance alternative to traditional Zener diodes, offering superior temperature stability and lower dynamic impedance. The Q-series designation indicates compliance with automotive quality standards, distinguishing it from commercial variants while maintaining functional compatibility within the broader TL431 ecosystem.

Replacement Considerations

TL431AQPK