MC74VHC1GT125 в SOT23-5: преобразователь уровня, допускает любую последовательность подачи сигналов и питания. http://www.onsemi.com/pub_link/Collateral/MC74VHC1GT125-D.PDF
The MC74VHC1GT125 input structure provides protection when
voltages up to 7 V are applied, regardless of the supply voltage. This
allows the MC74VHC1GT125 to be used to interface 5 V circuits to
3 V circuits. The output structures also provide protection when
VCC = 0 V. These input and output structures help prevent device
destruction caused by supply voltage − input/output voltage mismatch,
battery backup, hot insertion, etc.