AEC-Q100 precision shunt reference for automotive BOMs
The Texas Instruments LM4040QAIM3X2.5/NOPB is a precision shunt voltage reference with a fixed 2.5 V output, ±0.1% initial tolerance, and 35 µVrms noise over 10 Hz to 10 kHz.
The ±0.1% initial accuracy at 2.5 V keeps the reference error under 2.5 mV before temperature effects. As a shunt reference, the LM4040QAIM3X2.5/NOPB sinks current through a series resistor from the supply rail. The 65 µA minimum cathode current sets the lower bound for the bias current; the 15 mA maximum output current defines the load headroom. For a 5 V rail feeding a 2.5 V reference, a 1 kΩ series resistor delivers about 2.5 mA bias — enough to cover the cathode current plus a modest load while staying well under the 15 mA ceiling.
SOT-23-3 package — footprint and supply posture
The surface-mount footprint matches the standard SOT-23-3 land pattern — no special pad geometry required.