What the TL431CPWR does in your power rail
It sets a precision reference voltage at 2.495 V minimum, adjustable up to 36 V via two external resistors. Output current capability is 100 mA, with a minimum cathode current of 1 mA to maintain regulation. This makes it suitable for secondary-side regulation in AC-DC flyback supplies, precision shunt references in linear regulators, and as a voltage monitor threshold detector.
Last Buy — procurement window is closing
This is not an active-production part — Texas Instruments has announced end-of-life, and the final purchase window is open now. After the last-time-buy date passes, the only channel will be surplus and broker inventory.
8-TSSOP package — what the layout engineer sees
The 8-TSSOP body measures 4.40 mm wide. The supplier device package is 8-TSSOP.
Sourcing reality for a Last-Buy part
The TL431 family is widely second-sourced, but the TL431CPWR specific 8-TSSOP variant and ±2.2% grade should be matched to the BOM line before substituting. The base product number TL431 spans dozens of package and tolerance variants.