It provides a programmable output voltage from 2.495 V to 36 V via two external resistors, with a typical output impedance of 0.2 Ω. It is commonly used in isolated DC-DC converter feedback loops, adjustable power supplies, and voltage monitoring circuits where a stable reference is needed across temperature.
The TL431CKTPR carries an official product status of Obsolete. This means Texas Instruments has ceased production, and no further last-time-buy windows are open. The part is no longer available through authorized distribution channels. Availability and pricing are confirmed only at quote time, and quantities are typically limited to what exists on the spot market.
Package and mounting — board-fit checklist
The TL431CKTPR is a surface-mount device in the TO-252-3 (DPak) package, also known as SC-63, with two leads plus a tab. The tab is the cathode terminal and serves as the primary thermal path. The mounting type is Surface Mount, requiring a reflow or hot-air soldering process. The tab's large copper area on the PCB is essential for dissipating heat — the junction-to-ambient thermal resistance depends heavily on the board's copper pour. The package is, not Tape & Reel, which may affect pick-and-place handling for high-volume assembly.