TL431BCPK

Overview

The TL431BCPK is an adjustable precision shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.495 V to 36 V and features a B-grade initial accuracy of 0.5%. The device supports a maximum cathode current of 100 mA with a minimum operating current of 600 µA. It is housed in a SOT-89-3 surface-mount package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Provides precise voltage regulation through external resistor setting
• Offers low output impedance for stable performance
• Features high thermal stability across wide temperature ranges

Applications

• Board-level power regulation
• Adjustable power supplies
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix against official documentation, as variations may indicate different packaging or environmental ratings. Confirm availability status, as this component may be subject to discontinuation notices. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.

Selection Notes

Select this component when high precision and wide operating temperature are required. The B-grade tolerance suits applications demanding tight voltage accuracy. Consider the SOT-89-3 package for space-constrained designs requiring robust thermal dissipation compared to smaller packages.

Part Context

This part belongs to the TL431 family of programmable parallel regulators. These devices serve as versatile alternatives to Zener diodes in various power management circuits. The family is widely used in industrial and commercial electronics for reference voltage generation and loop control.

Replacement Considerations

Check for direct pin-compatible substitutes such as TL431ACPK or TL431ICPK if grade differences are acceptable. Verify that alternative components meet the same thermal and electrical specifications.