what is the application of diffusion and trasition capacitances

 

What is the context of your question? A capacitor is a capacitor in a circuit and we use them because that is the function we require.

Typical applications are
1- DC blocking
2- Filtering
3- Bypassing

 

I don't know that diffusion and transition capacitances have applications per se - but engineer types do have to account for their effects in some circuits. I suppose a varactor might be an "application" of transition capacitance. (Or am I remembering things backward?)

 

Hi,

That is probably so - but what is a diffusion capacitance?

 

Hi,

That is probably so - but what is a diffusion capacitance?

It's the capacitance caused by the minority charge carriers in the neutral regions. It is prominent only when the junction is forward biased. The value is not constant and depends on bias voltage.

As far as I know there's no useful application for it, and like Thingmaker mentioned, we do have to account for it during design or modelling.

 

Hi,

Thanks for the info. Sounds like the reason for junction storage and poor turn on/turn off.