Shunt reference with ±0.5% tolerance for precision feedback loops
Its key differentiator from the standard TL431 is the ±0.5% reference tolerance, which tightens the output voltage window in an isolated power supply or a linear regulator feedback divider.
Cathode current and output drive — sizing the bias resistor
The shunt requires a minimum cathode current of 100 µA to maintain regulation — below that the reference output drifts outside the ±0.5% window. The 15 mA output current rating sets the maximum sink capability through the cathode, which is the limit for driving an optocoupler LED in a feedback loop or for pulling down the feedback node in a series regulator.
Temperature grade and package — board-level fit
The TO-92-3 package (TO-226AA) is a through-hole form factor with formed leads, intended for manual assembly or wave-solder processes.