Lowest Leakage capacitor type

[Amalinda]

For my application I need a capasitor that has very low leakage current.

0.01uF ,2nA @ 3V bias. can anyone recommend me a specific type of capacitor to buy?
and another of 4.7uF lowest leakage.

Ceramic/ Tantulum etc which type should I use?

thank you so much.

 

[schmitt trigger]

You need a film cap.

The lowest leakage film caps are Teflon (PTFE) or Polystyrene (PS). But they are notoriously difficult to find. The next best would be polypropylene (PP). Don't use Polyester/Mylar (PET).

 

[Amalinda]

thank you so much for the information. so much appreciated.
p.s. Do you think Tantalum Capacitors are not so good?

 

[schmitt trigger]

They are good, but absolutely not for the ultra-low leakage level you require.
Check the datasheets.

 

[crutschow]

Tantalum capacitors have much higher leakage than film capacitors.