2.5 V shunt reference in 8-SOIC — what it is and where it fits
The Texas Instruments LM285MX-2.5/NOPB is a fixed 2.5 V shunt voltage reference in an 8-SOIC surface-mount package. It delivers up to 20 mA output current and requires a minimum of 20 µA cathode current to maintain regulation. The ±1.5% initial tolerance and 150 ppm/°C temperature coefficient suit general-purpose biasing and ADC/DAC reference applications in industrial control, instrumentation, and power-supply monitoring circuits that operate over -40°C to 85°C.
20 µA cathode current — the low-bias constraint
The 20 µA minimum cathode current sets the bias floor through the external resistor. The 20 mA output ceiling is generous for most reference loads.
Lifecycle and sourcing
The LM285MX-2.5/NOPB is listed as Active and ROHS3 compliant. It is a current-production part from Texas Instruments, available through independent distribution. No last-time-buy or obsolescence notice is in effect.
