[sdiy] MOSFET leakage.

[Simon Brouwer]

Hi Ian,

At 21:34 17-12-2005, Ian Fritz wrote:

>I spent some time yesterday looking for better devices to use for the 
>switch.  Speed isn't much of an issue, but lower capacitance would be 
>nice.  I found interesting thru hole devices from Supertex (VN2106 and 
>VN0104) and many interesting smd parts from Fairchild and others (BSS138 
>and FDV301N).  Anyone have experience with these or any other 
>suggestions?  Thanks.

As a rule of thumb, gate to channel capacitance is roughly inversely 
proportional to the on-resistance and to the threshold voltage.

So, for low capacitance, look for MOSFETs with relatively high on 
resistance, and with a threshold voltage that matches the control voltage 
levels in your circuit.

I have good experience with Fairchild MOSFETs for applications where low 
gate to channel and drain to source capacitances are a major consideration.

Vriendelijke groet,
Simon Brouwer.

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