This program uses the SOT-23 package.For precise voltage measurements, 0.05% is the tolerance.There is a part with 6 pins that have been settled.There is 3.3V voltage output.
LT6656AIS6-3.3#PBF Features
0.05% Tolerance
LT6656AIS6-3.3#PBF Applications
There are a lot of Analog Devices, Inc. LT6656AIS6-3.3#PBF Voltage Reference applications.