SN74LVC1G3157: Input Pin leakage current

Part Number: SN74LVC1G3157

I want to find a Analog MUX  for4:2 or 2:1 need very small leakage current (50nA) for input pin.

I want to use it to measure voltage , but it has 3.4MΩ impedanceNTC has very high impedance at low temperature.  This is why I need input pin has very small leakage current.

 

Requirment:

Analog MUX :

4:2 or 2:1.

Input Pin Leakage current: 50nA at -40°to -20°,   I couldn't find these data or waveform at datasheet.

Need auto Q1 version.

Power supply:  3.3V

 

Do you have some good suggestion for this application?