TL431CPKE6

Overview

The TL431CPKE6 is a precision programmable shunt regulator manufactured by Texas Instruments. It operates within an input voltage range of 2.5 V to 36 V and provides an adjustable output voltage from approximately 2.495 V to 36 V using two external resistors. The device features a typical output impedance of 0.2 Ω and supports cathode currents between 1 mA and 100 mA. It is housed in an SOT-89-3 surface-mount package with dimensions of 4.50 mm length, 2.50 mm width, and 1.60 mm height. The component functions as a high-performance alternative to Zener diodes in various power management applications.

Feature Summary

• Provides precise programmable reference voltage capabilities for stable circuit regulation
• Features low output noise characteristics suitable for sensitive analog circuits
• Offers active output circuitry with defined turn-on characteristics for reliable switching

Applications

• Board-level voltage regulation systems
• Adjustable linear and switching power supplies
• Replacement for standard Zener diodes in reference circuits

Procurement Notes

Verify the specific suffix 'E6' against the manufacturer's current datasheet to confirm it denotes RoHS compliance or a specific tape-and-reel packaging variant. Ensure the SOT-89-3 package footprint matches the target PCB design. Confirm thermal stability specifications align with the intended operating temperature range before finalizing procurement.

Selection Notes

Select this component when a compact surface-mount solution is required for precision voltage referencing. The SOT-89-3 package offers a smaller footprint compared to traditional through-hole options while maintaining robust current handling capabilities. Consider the ±1% tolerance if higher accuracy grades are not strictly necessary for the application.

Part Context

This part belongs to the TL431 family of adjustable shunt regulators, widely used in power supply feedback loops. The 'C' grade indicates a standard tolerance level, while the 'PK' suffix identifies the SOT-89-3 surface-mount package. The 'E6' suffix typically signifies environmental compliance attributes such as lead-free manufacturing processes.

Replacement Considerations

Compatible substitutes include TL431ACP (DIP), TL431AILP (TO-92), and TL431AIDBZR (SOT-23). Verify pinout compatibility and package dimensions when transitioning between different form factors within the same functional family.