npn and pnp definitions
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Another newbie question...
Can someone define for me the meanings of and diferences between npn
and pnp related to mosfet transitors? Thanks.
Scott
Can someone define for me the meanings of and diferences between npn
and pnp related to mosfet transitors? Thanks.
Scott
Comments
mosfet acts like a pnp transistor. bipolar transistors have thier parts
labled emiter, colector, and base, the fets will have ther corasponding
parts labeled source, drain, and gate, keep in mind that a biplar transistor
(npn, pnp) are curent controled switch and that fets are vlotage controled
so you will ether nead pull up of pull down risistors. a fet's gate is vary
sensitive to damage from static discharge. id you will be switching
inductive loads, ie: relays, motors you will nead a protection diode across
the fet, most of the power fets that i use have protection diodes built in
to them.
hope this helps
Lincoln
> Can someone define for me the meanings of and diferences between npn
> and pnp related to mosfet transitors? Thanks.
>
> Scott
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
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>
However the behavior of a mosfet is much different than that of
a transistor and can make a BIG difference depending on the
circuit design. A mosfet is considered a resistive element,
where a bipolar transistor exhibits characteristics of a diode.
>a n channel fet or mosfet acts like a npn transitor. a p channel fet or
>mosfet acts like a pnp transistor. bipolar transistors have thier parts
>labled emiter, colector, and base, the fets will have ther corasponding
>parts labeled source, drain, and gate, keep in mind that a biplar transistor
>(npn, pnp) are curent controled switch and that fets are vlotage controled
>so you will ether nead pull up of pull down risistors. a fet's gate is vary
>sensitive to damage from static discharge. id you will be switching
>inductive loads, ie: relays, motors you will nead a protection diode across
>the fet, most of the power fets that i use have protection diodes built in
>to them.
>
>hope this helps
>Lincoln
>
>
> > Can someone define for me the meanings of and diferences between npn
> > and pnp related to mosfet transitors? Thanks.
> >
> > Scott
> >
Beau Schwabe Mask Designer IV - ATL
National Semiconductor Enterprise Networking Business Unit
500 Pinnacle Court, Suite 525 Wired Communications Division
Mail Stop GA1 Norcross, GA 30071
taken more circuits courses when I was in my aero engineering program.
Aside from that, is there anything out there that explains transistors and
MOSFETs in english, but in more than just elementary school terms?
Don
Original Message
From: "Beau Schwabe" <bschwabe@a...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, June 07, 2002 10:51 AM
Subject: Re: [noparse][[/noparse]basicstamps] npn and pnp definitions
> As far as controlling the device your statement is correct.
> However the behavior of a mosfet is much different than that of
> a transistor and can make a BIG difference depending on the
> circuit design. A mosfet is considered a resistive element,
> where a bipolar transistor exhibits characteristics of a diode.
>
>
>
> >a n channel fet or mosfet acts like a npn transitor. a p channel fet or
> >mosfet acts like a pnp transistor. bipolar transistors have thier parts
> >labled emiter, colector, and base, the fets will have ther corasponding
> >parts labeled source, drain, and gate, keep in mind that a biplar
transistor
> >(npn, pnp) are curent controled switch and that fets are vlotage
controled
> >so you will ether nead pull up of pull down risistors. a fet's gate is
vary
> >sensitive to damage from static discharge. id you will be switching
> >inductive loads, ie: relays, motors you will nead a protection diode
across
> >the fet, most of the power fets that i use have protection diodes built
in
> >to them.
> >
> >hope this helps
> >Lincoln
> >
> >
> > > Can someone define for me the meanings of and diferences between npn
> > > and pnp related to mosfet transitors? Thanks.
> > >
> > > Scott
> > >
>
>
> Beau Schwabe Mask Designer IV - ATL
> National Semiconductor Enterprise Networking Business Unit
> 500 Pinnacle Court, Suite 525 Wired Communications Division
> Mail Stop GA1 Norcross, GA 30071
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
I would highly recommend The Art of Electronics by Horowitz and Hill. I
find it on the shelf of most of the biology graduate students who want to
understand electronics without having to take an engineering course.
Mike
At 11:03 AM 6/7/2002 -0700, you wrote:
>, is there anything out there that explains transistors and
>MOSFETs in english, but in more than just elementary school terms?
_________________________________
Mike Walsh
walsh@i...
[noparse][[/noparse]Non-text portions of this message have been removed]
http://ece-www.colorado.edu/~bart/book/book/append/append1.htm
> If I'd been smarter (who is when they're young and in college), I'd have
>taken more circuits courses when I was in my aero engineering program.
>Aside from that, is there anything out there that explains transistors and
>MOSFETs in english, but in more than just elementary school terms?
>Don
>
Original Message
>From: "Beau Schwabe" <bschwabe@a...>
>To: <basicstamps@yahoogroups.com>
>Sent: Friday, June 07, 2002 10:51 AM
>Subject: Re: [noparse][[/noparse]basicstamps] npn and pnp definitions
>
>
> > As far as controlling the device your statement is correct.
> > However the behavior of a mosfet is much different than that of
> > a transistor and can make a BIG difference depending on the
> > circuit design. A mosfet is considered a resistive element,
> > where a bipolar transistor exhibits characteristics of a diode.
> >
> >
> >
> > >a n channel fet or mosfet acts like a npn transitor. a p channel fet or
> > >mosfet acts like a pnp transistor. bipolar transistors have thier parts
> > >labled emiter, colector, and base, the fets will have ther corasponding
> > >parts labeled source, drain, and gate, keep in mind that a biplar
>transistor
> > >(npn, pnp) are curent controled switch and that fets are vlotage
>controled
> > >so you will ether nead pull up of pull down risistors. a fet's gate is
>vary
> > >sensitive to damage from static discharge. id you will be switching
> > >inductive loads, ie: relays, motors you will nead a protection diode
>across
> > >the fet, most of the power fets that i use have protection diodes built
>in
> > >to them.
> > >
> > >hope this helps
> > >Lincoln
> > >
> > >
> > > > Can someone define for me the meanings of and diferences between npn
> > > > and pnp related to mosfet transitors? Thanks.
> > > >
> > > > Scott
> > > >
> >
> >
> > Beau Schwabe Mask Designer IV - ATL
> > National Semiconductor Enterprise Networking Business Unit
> > 500 Pinnacle Court, Suite 525 Wired Communications Division
> > Mail Stop GA1 Norcross, GA 30071
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
> >
> >
> >
>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Beau Schwabe Mask Designer IV - ATL
National Semiconductor Enterprise Networking Business Unit
500 Pinnacle Court, Suite 525 Wired Communications Division
Mail Stop GA1 Norcross, GA 30071
start through it later.
Don
Original Message
From: "Beau Schwabe" <bschwabe@a...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, June 07, 2002 11:56 AM
Subject: Re: [noparse][[/noparse]basicstamps] npn and pnp definitions
> This might be a good start:
>
> http://ece-www.colorado.edu/~bart/book/book/append/append1.htm
>
>
> > If I'd been smarter (who is when they're young and in college), I'd
have
> >taken more circuits courses when I was in my aero engineering program.
> >Aside from that, is there anything out there that explains transistors
and
> >MOSFETs in english, but in more than just elementary school terms?
> >Don
> >
Original Message
> >From: "Beau Schwabe" <bschwabe@a...>
> >To: <basicstamps@yahoogroups.com>
> >Sent: Friday, June 07, 2002 10:51 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] npn and pnp definitions
> >
> >
> > > As far as controlling the device your statement is correct.
> > > However the behavior of a mosfet is much different than that of
> > > a transistor and can make a BIG difference depending on the
> > > circuit design. A mosfet is considered a resistive element,
> > > where a bipolar transistor exhibits characteristics of a diode.
> > >
> > >
> > >
> > > >a n channel fet or mosfet acts like a npn transitor. a p channel fet
or
> > > >mosfet acts like a pnp transistor. bipolar transistors have thier
parts
> > > >labled emiter, colector, and base, the fets will have ther
corasponding
> > > >parts labeled source, drain, and gate, keep in mind that a biplar
> >transistor
> > > >(npn, pnp) are curent controled switch and that fets are vlotage
> >controled
> > > >so you will ether nead pull up of pull down risistors. a fet's gate
is
> >vary
> > > >sensitive to damage from static discharge. id you will be switching
> > > >inductive loads, ie: relays, motors you will nead a protection diode
> >across
> > > >the fet, most of the power fets that i use have protection diodes
built
> >in
> > > >to them.
> > > >
> > > >hope this helps
> > > >Lincoln
> > > >
> > > >
> > > > > Can someone define for me the meanings of and diferences between
npn
> > > > > and pnp related to mosfet transitors? Thanks.
> > > > >
> > > > > Scott
> > > > >
> > >
> > >
> > > Beau Schwabe Mask Designer IV - ATL
> > > National Semiconductor Enterprise Networking Business Unit
> > > 500 Pinnacle Court, Suite 525 Wired Communications Division
> > > Mail Stop GA1 Norcross, GA 30071
> > >
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
and
> >Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
> Beau Schwabe Mask Designer IV - ATL
> National Semiconductor Enterprise Networking Business Unit
> 500 Pinnacle Court, Suite 525 Wired Communications Division
> Mail Stop GA1 Norcross, GA 30071
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
I can thoroughly recommend the following book: -
Horowitz & Hill, The Art of Electronics.
Covers most electronic subjects in easy to understand detail. My copy is
falling apart at the seams, 25 years in the electronics industry and I
still refer to it at least once a week.
Rob
Original Message
From: Don [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=9OI0b-k0MKIRVrhW2nfp4Ie8UZFO2of68_qOIDBjisr6jVaAr_gcBiv6-yp1BNJbAM9pDgpW0tsDq1965ZVATIn62Q]renegade.engineer@v...[/url
Sent: 07 June 2002 19:03
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] npn and pnp definitions
If I'd been smarter (who is when they're young and in college), I'd
have
taken more circuits courses when I was in my aero engineering program.
Aside from that, is there anything out there that explains transistors
and
MOSFETs in english, but in more than just elementary school terms?
Don
electronics.
Shows what an excellent Book it is.
Rob
Original Message
From: Rob [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=yekAaWJtpzezC0srmIr4AbabfqDSurmczDqUxyw2rx_VEc5C8RxqXhkgZod3VodKRPdfNIRiQAogr0v2LnDToiU]robbed666@b...[/url
Sent: 07 June 2002 21:30
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] npn and pnp definitions
Hi Don,
I can thoroughly recommend the following book: -
Horowitz & Hill, The Art of Electronics.
Covers most electronic subjects in easy to understand detail. My copy is
falling apart at the seams, 25 years in the electronics industry and I
still refer to it at least once a week.
Rob
Beau sent a bookmark for, and then I'll probably get a copy of the Horowitz
and Hill book later.
Thanks to both you and Mike!
Don
Original Message
From: "Rob" <robbed666@b...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, June 07, 2002 1:37 PM
Subject: RE: [noparse][[/noparse]basicstamps] npn and pnp definitions
> Just seen Mike Walsh's simultaneous post re: Horowitz & Hill The Art of
> electronics.
> Shows what an excellent Book it is.
>
> Rob
>
>
Original Message
> From: Rob [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=u_CeCgVOrx0mpdH5jDVPTZZ2Oz1qSh2EkTj7De3ORA1sg2C5-_egOwj6Tpj-7iiAkQpbOAwInJf0uTrGhE2xJN4]robbed666@b...[/url
> Sent: 07 June 2002 21:30
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] npn and pnp definitions
>
> Hi Don,
>
> I can thoroughly recommend the following book: -
> Horowitz & Hill, The Art of Electronics.
> Covers most electronic subjects in easy to understand detail. My copy is
> falling apart at the seams, 25 years in the electronics industry and I
> still refer to it at least once a week.
>
> Rob
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
When I taught Industrial Electronics at the local vocational school, one
of my primary objectives was to show the students how transistors work.
We were not concerned with physics and hole flow and all that
engineering stuff, We wanted to learn just enough to repair the the
device if it was in working circuit and for some reason stopped
working. Here are some of the things I stressed:
Current flow is made up of electrons and they from negative to positive
An NPN transistor is an amplifier for current, that is a small controls
current (Ib) -- controls a larger current (Ic).
An NPN transistor has three currents emitter, collector, and base
current. The relation ship between the three is emitter current equals
base current plus collector current.
The device has a gain which we called beta. Beta equals base current
times collector current. Or beta = Ib * Ic If a transistor has a beta
of 200 this means the base current is 1/200 of the collector current.
Obviously the higher the beta - the higher the input impedance and the
better the device performed in the circuit.
To associate an NPN transistor with it's schematic symbol we said it had
NOT POINTED IN POINTER. A PNP had a POINTED IN POINTER. Kinda simple,
but it works.
Current directions: for an NPN device the base current would enter the
device at the emitter and exit at the base. This was the control
current. Collector current would also enter at emitter and exit at the
collector. This was the controlled current.
There are several more points but they involve resistors outside the
device and what percent of the supply voltages was placed at what points
in the circuit. i.e. emitter voltage is usually 10% of the supply, base
voltage is usually 1/2 the supply and is .7 volts more positive than the
emitter. These are not rules by any means just general guidelines for a
transistor operated as a class A amplifier.
A PNP device works in a similar way, except the polarities and current
flows are reversed.
HTH,
Leroy
two major booksellers on the Net are selling it for list price, $70.00. I
have no affiliation with any of them, I'm just a humble electrician looking
to save a couple of bucks.... ;-}
Tom
Original Message
> Date: Fri, 7 Jun 2002 21:29:59 +0100
>From: "Rob" <robbed666@b...>
>Subject: RE: npn and pnp definitions
>Hi Don,
>I can thoroughly recommend the following book: -
>Horowitz & Hill, The Art of Electronics.
>Covers most electronic subjects in easy to understand detail. My copy is
>falling apart at the seams, 25 years in the electronics industry and I
>still refer to it at least once a week.
>Rob
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