The REF5025MDTEP: No last-time-buy window is open, and no end-of-life notice has been issued.
2.5 V fixed output with ±0.05% initial accuracy
The REF5025MDTEP is a series voltage reference from Texas Instruments that outputs a fixed 2.5 V with a tolerance of ±0.05%. That initial accuracy — 1.25 mV at 25 °C — is the starting point for the entire analog chain. For a 16-bit ADC with a 2.5 V reference input, this error contribution is about 8 LSBs before any drift or noise is factored in. The series topology means the output is buffered and can source up to 10 mA to the load without an external buffer.
6.5 ppm/°C drift across the full military range
Over that 180 °C span, the output voltage shifts by roughly 0.12% — about 3 mV. That is the drift budget the system designer has to allocate between the reference and the rest of the analog front end.
7.5 µVp-p low-frequency noise floor
Noise in the 0.1 Hz to 10 Hz band is specified at 7.5 µVp-p. This is the flicker-noise corner that dominates in precision DC measurements — a weigh scale, a strain-gauge amplifier, or a data-acquisition front end. At 2.5 V output, that noise is about 3 ppm peak-to-peak of the output voltage. For a 24-bit sigma-delta ADC, this noise sets the practical resolution limit; below this floor, averaging is the only way to extract more bits.
Input range and quiescent current
The quiescent supply current is 1.25 mA — low enough that the reference does not dominate the power budget in a battery-backed or energy-harvesting system, though not the lowest in the class. The output can sink or source 10 mA, which is enough to drive the reference input of most ADCs and DACs without an external buffer.
8-SOIC package — board-level fit
The 0.154-inch (3.90 mm) width is the narrow SOIC variant, so confirm the PCB land pattern matches the N or D package outline — the wider 7.5 mm SOIC-8 will not fit.