Re: gEDA-user: [SOT] suggestion for a SMT switch

[Jason <geda@xxxxxxxxxxxxxx>]

DJ Delorie wrote:
>> I'm concerned about leakage.  This device will probably sit on a
>> shelf for some time (with battery inserted, pic in sleep mode).  I
>> wanted to make sure there wasn't a trickle of current through the
>> motor.
> 
> Perhaps you could tie 4-5 PIC pins together to get the needed current?
> 

Not possible.  I have only three output pins and the other two are in
use.  :-(

> Otherwise, look for the smallest MOSFET that will handle your current,
> as smaller size usually means smaller leakage current.  For example,
> the Fairchild 2N7002K (SOT-23) leaks 1 uA when off (Vgs == 0) but the
> 2N7002T (SOT-523) leaks only 1 nA when off.  The 1G125 "leaks" 10 uA
> when on (Icc).
> 

Awesome, thanks!  That was exactly what I was missing.  I'll take a look
at the 2N7002T more carefully in the morning.

thx,

Jason.


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