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'Basic Electronics Questions-...hexfets, rectifier.'
1999\01\09@151910 by Jon Petty

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Hi

Just a couple of questions.

What's the difference between a NPN transistor and an NPN hexfet?
Under what conditions would you use a hexfet?

What's the difference between a diode and a rectifier?
Are those names used interchangeably?

Thanks in advance

Jon

1999\01\09@155415 by Gabriel Gonzalez

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face
>Hi
>
>Just a couple of questions.
>
>What's the difference between a NPN transistor and an NPN hexfet?
>Under what conditions would you use a hexfet?


Hexfet is a trademark from International Rectifier for their line of power
MOSFETs.

>
>What's the difference between a diode and a rectifier?
>Are those names used interchangeably?


Diode is the generic name, and rectifier refers to the application of a
diode (to rectify current).

>
>Thanks in advance
>
>Jon

Gabriel

1999\01\09@180724 by Mike Keitz

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On Sat, 9 Jan 1999 15:15:37 EST Jon Petty <spam_OUTPHXSYSTakeThisOuTspamAOL.COM> writes:

>What's the difference between a NPN transistor and an NPN hexfet?
>Under what conditions would you use a hexfet?

There's no such thing as a "NPN hexfet".  The polarity is designated by
the terms "N-channel" or "P-channel" devices.  "Hexfet" is one
manufacturer's brand name.  More generically they're called "power
MOSFETs" or just "power FETs".  Sometimes you'll see N-FET or P-FET to
designate FETs of different polarities.

Both types of devices have 3 terminals.  The Drain, Gate, and Source
terminals of a FET correspond approximately to the Collector, Base, and
Emitter terminals of a bipolar.

The big difference between a bipolar and a FET is that the former is
current-operated and the latter is voltage-operated.  Tunring a bipolar
on requires about 0.7V but a continuous drive current to the base.  A FET
requires several volts to turn on, but requires drive current only during
the transistion time to charge up the ratehr large capacitance between
the gate and source.  In most cases, much less drive power is required to
switch a FET.  But for rapid switching, the driver needs to be able to
supply large surges of current.

>
>What's the difference between a diode and a rectifier?
>Are those names used interchangeably?

The name "diode" can describe any diode.  Rectifiers are diodes used to
convert AC power into DC.  Certain diode types are optimized for
rectifier use.  They can pass several amps of current, however they are
rather slow to turn off, limiting their usefullness at frequencies higher
than 60 Hz.  Fast power diodes have been developed for switching power
supplies.  These diodes are often based on Schottky technology.


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1999\01\10@063927 by Mark Willis

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Mike Keitz wrote:
{Quote hidden}

 The thing that makes HexFETs nice IMHO is that they consist of "scads"
of small FETs in parallel, and they incorporate a built-in reverse
protection diode - they get their name from being made in a hexagonal
(honeycomb) pattern.  Internations Rectifier makes those.  I use them in
place of relays, and still add a protection diode quite often "for luck"
<G>  They're a good replacement for relays for most situations (read the
IR specs, get to know the rules, and you should have good luck with
them.)  If you drive one from a CMOS 4000 series gate, you want to put a
current limiting series resistor between 4000 output and the gate of the
FET so as to not blow the CMOS output stage up, and expect the gate to
take a little time to switch (1/RC right?) - for relay type sitations,
not a problem usually.

 Mark, mwillisspamKILLspamnwlink.com

1999\01\11@110731 by Jon Petty

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Thanks for the help

You guys are great!


Jon

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