3 V shunt reference for precision bias and ADC references
It is designed for low-power bias circuits, ADC reference inputs, and comparator threshold setting where a stable, low-noise voltage is needed without a series regulator. The shunt topology means it behaves like a Zener diode — it sinks current from a supply through an external resistor, regulating the voltage across its terminals.
The temperature coefficient is 150 ppm/°C, which translates to a worst-case voltage shift of about 0.45 mV per degree — acceptable for 8-bit or 10-bit ADC references but marginal for 12-bit systems without calibration. Noise from 10 Hz to 10 kHz is 35 µVrms, clean enough for most precision analog stages.
Through-hole TO-92-3 package — legacy footprint, still in production
The LM4040D30ILPR comes in a TO-226-3 / TO-92-3 package with formed leads, a through-hole form factor common in older designs, prototyping, and rework-friendly layouts. It ships in Cut Tape (CT) and Tape & Box (TB) — the TB variant is convenient for manual assembly or low-volume production where reels are unnecessary. The base product number is LM4040, so the D30ILPR suffix specifies the 3 V output, ±1% grade, and through-hole package variant.