Fixed 3.3 V reference with ±0.15% accuracy
The MAX6029EUK33+T is a precision series voltage reference that outputs a fixed 3.3 V with an initial tolerance of ±0.15 %. That 0.15 % figure is tighter than the common 1 % or 0.5 % references you see in general-purpose regulator feedback dividers — it is aimed at ADC reference inputs, DAC bias rails, or sensor excitation where the system accuracy budget starts at the reference. Supply current is 7.25 µA typical, which keeps the thermal load negligible and makes the part viable for battery-powered instrumentation or always-on sensor nodes where every microamp counts. The input voltage range spans 3.5 V to 12.6 V, so it can run from a 5 V rail or a 12 V industrial supply without a separate LDO.
Noise and temperature drift for precision loops
Output noise is specified as 56 µVp-p over 0.1 Hz to 10 Hz and 174 µVrms over 10 Hz to 10 kHz. For a 3.3 V reference, that is roughly 17 ppm p-p low-frequency noise — clean enough for a 16-bit SAR ADC without an external filter capacitor on the reference pin. The temperature coefficient is 30 ppm/°C, which means a 50 °C swing shifts the output by about 5 mV; budget that into your system accuracy calculation. Output current capability is 4 mA. That is enough to drive a single ADC reference input or a small resistive divider load; if you need to bias multiple converters or a heavy load, buffer the output with an op-amp.
SOT-23-5 footprint and ordering options
The device comes in an SC-74A / SOT-753 package, which is the standard 5-pin SOT-23 footprint. The supplier device package is listed as SOT-23-5. It is offered on Tape & Reel (TR) or Cut Tape (CT) — the CT option is convenient for prototype builds without committing to a full reel. Surface-mount assembly is straightforward; the small body fits into dense mixed-signal layouts.