5V shunt reference in a SOT-23-3 — what the ratings mean
The ±0.2 % initial tolerance and 100 ppm/°C temperature coefficient mean this part holds its output within about 10 mV over the full -40 to 85 °C range — tight enough for a 12-bit ADC reference without external trimming. The shunt topology sinks up to 15 mA through the cathode, so the series resistor sets the total current budget; the 95 µA minimum cathode current is the floor below which regulation drops out.
The part ships in a SOT-23-3 package (also listed as TO-236-3 / SC-59). The three-pin footprint is standard: cathode, anode, and no-connect. The 0.95 mm pin pitch and 2.9 mm body length fit comfortably on a two-layer board.
No official second-source or successor is listed, but the LM4040 family includes multiple tolerance grades (A/B/C/D) and output voltages (2.5 V, 4.096 V, 5 V) in the same SOT-23-3 footprint if a design change is needed.