Active production — ±1% adjustable shunt reference in SOT-89-3
The TL431AQPKG3: It delivers a ±1% initial tolerance on the 2.495 V internal reference, adjustable up to 36 V via two external resistors. The SOT-89-3 (TO-243AA) surface-mount package suits compact power supply and control loops where board space is tight.
Output range and cathode current — the operating window
The shunt can sink up to 100 mA continuous, with a minimum cathode current of 700 µA to maintain regulation. The 2.495 V minimum output sets the floor; the 36 V maximum output covers most common rail voltages from 3.3 V to 24 V systems.