Fixed 5V reference in a SOT-23-3 — what it buys the design
The MAX6005EUR+T from Maxim Integrated is a series voltage reference that delivers a fixed 5V output with ±1% initial accuracy. It operates from an input voltage range of 5.2V to 12.6V, drawing only 45 µA of supply current, making it suitable for battery-powered or low-power systems where a clean 5V rail is needed for ADC references, DAC biasing, or sensor excitation. The 100 ppm/°C temperature coefficient keeps the output stable across the -40°C to 85°C industrial temperature range, so the reference holds its accuracy in outdoor telecom cabinets, factory-floor controllers, or under-hood electronics that see wide thermal swings.
Noise and load drive — where the 400 µA limit matters
The MAX6005EUR+T is rated for 400 µA output current, which is enough to bias the reference input of most SAR ADCs or a single op-amp stage, but not enough to power a multi-channel converter bank or a heavy load. The low-frequency noise is specified at 120 µVp-p from 0.1 Hz to 10 Hz and 240 µVrms from 10 Hz to 10 kHz — figures that place it in the mid-precision tier. For a 16-bit ADC with a 5V reference, that noise contributes roughly 1.5 LSBs of uncertainty at the low-frequency band, which is acceptable for many industrial measurements but may need a cleaner reference for audio or weigh-scale applications.
Sourcing and lifecycle — no last-time-buy pressure
This removes the urgency of a last-time-buy and makes it a safe choice for new designs that will run for several years. The part is ROHS3 compliant, and the SOT-23-3 package is a standard footprint shared across many voltage references, so board layout and reflow profiles are well understood.