It provides a 2.495 V internal reference and can regulate output voltages up to 36 V by adding an external resistor divider. This part is obsolete, so if you're staring at a scorch mark on a board with one of these, the repair path is a pin-compatible replacement or a board rework to accept the more common TL431 pinout.
100 mA cathode current — load-driving reality
Rated for 100 mA continuous output current with a minimum cathode current of 1 mA to maintain regulation. The ±2.2% tolerance on the reference voltage is tighter than the standard ±2.5% grade, which matters for precision supply rails or comparator thresholds where the setpoint needs to stay within a few millivolts.
Obsolete — sourcing the replacement
The closest functional equivalent is the TL431 family, but the pinout difference (cathode and reference swapped) means a direct drop-in replacement requires the TL432 variant — check the suffix for the SOT-23-5 package.