Adjustable shunt reference with ±0.5% precision
Its ±0.5% tolerance on the 2.495 V internal reference makes it a B-grade selection for applications that need tighter regulation than the standard 1% or 2% TL431 grades. This is a shunt-type reference, meaning it operates in parallel with the load and regulates by shunting current away from the load through the cathode.
Last Buy — plan the BOM transition
This is not an active-production part — the manufacturer has issued a last-time-buy notice, and remaining inventory is finite. The TL431 function itself is a standard industry pinout — the TL431BCPWR is the B-grade, ±0.5% tolerance variant in the 8-TSSOP package. A replacement search should focus on the same package (8-TSSOP), same tolerance grade, and same pin-compatible shunt reference function. The base product number is TL431, and other TL431B-grade parts in 8-TSSOP from TI or second-source manufacturers may serve as a cross.
Parametric fit for the BOM
The ±0.5% tolerance is the headline differentiator. A standard TL431 is typically 1% or 2%; the B-grade part is specified for designs where the reference voltage accuracy directly affects system precision — for example, setting the output of an isolated DC-DC converter via an optocoupler, or providing a stable bias for an ADC reference input. The 8-TSSOP package is a surface-mount, 4.40 mm wide body with a 0.65 mm pin pitch. The supplier device package is 8-TSSOP. The mounting type is surface mount.