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Thread: OK to operate at the absolute max rating?
face picon face BY : email (remove spam text)(Olin Lathrop)

Tomás Ó hÉilidhe wrote:
> FET's might draw very little current, but I don't see how they could
> possibly get away with drawing no current whatsoever.

Think of it this way:  It takes energy to turn the valve on your water
spigot, but once you have it at the desired setting no further energy is
required to keep it there, and it continues to regulate the water flow
whether that is on, off, or someplace in between.

A FET gate mostly looks like a capacitor, so there is a little energy
required to change its voltage.  But once the desired gate voltage has been
reached, it requires no additional inherent energy.  There is a little
capacitive coupling from other places, like the drain in particular, that
you have to overcome, and there is a little leakage mostly thru the dirt
between the FET leads, but other than that a FET gate doesn't require any
energy input to maintain its setting.  Flash memory works on this principle.

Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
<002d01c8e82d$79e48190$0300a8c0@main> quoted-printable

See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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