Enhanced Product 2.5-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy 3-SOT-23 -55 to 125
Texas Instruments
Texas Instruments - V62/11615-01XB
$1.98 - $2.19
Texas Instruments - LM4040C25-EP
$1.98 - * $5.93
Texas Instruments - LM4040C25MDBZTEP
* $2.46 - * $5.93