How do you like this symbol? ;-)
As for MOSFETs, the arrow represents the substrate-channel diode. It always makes me shake my head when I see those symbols with the parasitic zener explicitly piggybacked, as though it were an entirely seperate element (which is isn't, though schottky-backed MOSFETs and FRED-backed IGBTs exist, but neither is the pure MOSFET we're talking about). It's as if people don't even know the meaning of the symbol they're using.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Jasen Betts" wrote in message news:gio1sd$vbk$6@reversiblemaps.ath.cx... > On 2008-12-21, blackhead wrote: >> Why does the arrow in an N-channel mosfet symbol point towards the >> channel from the substrate? > > same reason the arrow in an NPN transistor points towards the emitter.
And that leaves holes everywhere.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
Isn't there a charge for that?
Ed
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...Jim Thompson
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I love to cook with wine Sometimes I even put it in the food
Certainly, and it's taxing.
Tim has the best answer. The diode junction represented by the arrow in a MOSFET symbol is reverse biased under normal operating conditions.
Its there to remind you of which way not to connect the device as well as to represent a junction capacitance to the substrate.
-- Paul Hovnanian paul@hovnanian.com ----------------------------------------------------------------------- Have gnu, will travel.
Sheesh! 2 of those would be electronically re-volting.
Ed
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