3V shunt reference with automotive-grade precision
The Maxim MAX6009AEUR-T is a 3V fixed-output shunt voltage reference in a SOT-23-3 package, rated for the -40°C to 85°C industrial temperature range and qualified to AEC-Q100 for automotive applications. Its ±0.2% initial tolerance and 30ppm/°C temperature coefficient deliver the accuracy needed for ADC references, sensor excitation, and supply monitoring in engine-control units, body controllers, and infotainment modules.
Low cathode current and output drive
The 1 µA minimum cathode current lets this reference operate from a high-impedance bias resistor with minimal quiescent loss — useful in always-on automotive modules where every microamp counts. The 20 mA output current capability is generous for a shunt reference; it can drive multiple ADC inputs or a small resistive load while maintaining regulation. The shunt topology means the part sinks current from the supply through an external resistor; total current draw equals the load current plus the 1 µA minimum bias, so efficiency depends on the supply voltage and load conditions.
Package and mounting
The SOT-23-3 (TO-236-3 / SC-59 compatible) footprint is a standard three-pin surface-mount package. The shunt reference needs only one external resistor between the supply and the cathode pin.
Lifecycle and sourcing reality
It is a current-production part from Maxim Integrated (now part of Analog Devices), qualified under the Automotive AEC-Q100 series. The RoHS non-compliant marking means this variant uses lead-bearing terminations — verify your assembly house's exemption policy if you require full RoHS compliance.