duh....of course!!! Sometimes I feel like my light bulb is just a little dim. >From: Ned Konz >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [EE]: MOSFET as a digital switch >Date: Thu, 13 Feb 2003 09:36:18 -0800 > >On Thursday 13 February 2003 09:09 am, you wrote: > > All this talk of FET's is bringing back some fuzzy memories of it > > when in class. Thats what happens when you just do digital design > > for years. > > > > These are bidirectional devices right? Such that it doesnt matter > > if the load is attached to the drain or source? Or does it matter? > >Yes, because there is a "body diode" between D and S. > >On a N-channel device, the body diode will conduct (even if the >transistor is OFF) when the S becomes more than a little positive >than the D. > >P channel devices are reversed from that. > >So when there's a real bidirectional current flow requirement, people >tend to use two FETs with their diodes back to back. > >-- >Ned Konz >http://bike-nomad.com >GPG key ID: BEEA7EFE > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.