Adjustable shunt reference – what the 2.495 V to 36 V range buys you
It is the workhorse precision reference for any design that needs a stable voltage between 2.495 V and 36 V, set by two external resistors. The ±1% initial tolerance keeps the output accurate without trimming, and the 15 mA output current is enough to bias optocouplers, set comparator thresholds, or supply a low-power ADC reference. The 1 mA minimum cathode current means the reference stays in regulation even at light load – a detail that matters when you are sizing the bias resistor in a power-supply feedback loop.
SOT-23-3 footprint and temperature range
The TL431LIAIDBZR comes in a SOT-23-3 package (also listed as TO-236-3 / SC-59). That three-pin footprint matches the industry-standard TL431 pinout, so any board already using a SOT-23-3 shunt reference can drop this part in without a layout change. No special thermal management needed at 15 mA output; the SOT-23-3 body handles the dissipation as long as the cathode voltage stays within the 36 V maximum.
That means no last-time-buy deadline to track, no end-of-life scramble.