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'[EE]:: MOSFET selector guide wanted'
2007\12\08@234323 by Apptech

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Can anyone suggest a wide ranging usefully searchable list
of MOSFETS (and in addition other transistors if available).

What I would like to be able to do is to select useful
parameters to provide a subset of parts. There are various
partial solutions to this but none that I am aware of that
do the job "properly".

A good start is searching for MOSFET at Digikey and then
using their parametric search. However, this does not handle
all of what I would consider to be key parameters. These
would include

Vgs_min (= Vth)
Rds_on
Id max
Vd max
Pd
...

Follow that with any number of esoteric extras.
Having indicative price as a searchable parameter would be
useful.

These are almost in order of importance in many cases. ie
while there are many tables that will allow you to select
devices by voltage, current and power rating, few allow you
to specify Vgs_min and Rds_on as searchable parameters.

When working with low voltage systems (Say under about 6 or
maybe 10 volts) then Vgs_min can be crucial in determining
whether a given device will actually be able to be fully
enhanced with the available voltage. By itself the threshold
voltage will not be a certain indicator - you need to
examine characteristic tables to see what is really claimed,
but a Vgs_min of 5 volts is not going to work on a 5 volt
system. Similarly Rdson  is best used as an indicator of the
value that will never be attained in a practical
application, but is a good starting point.

FWIW Vgsmax is a good first order indicator of Vgs_min as
both tend to be influenced by gate oxide thickness. A GET
with Vgs_min / Vth of around 1 volt often has Vgsmax of 8
Volt or less and is most unlikely to have Vgsmax > 12 Volt.

I'm looking for all FETs that match a certain need and it's
surprisingly had to do so without opening many data sheets.

2007\12\09@122717 by Steven Howes

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> A good start is searching for MOSFET at Digikey and then
> using their parametric search. However, this does not handle
> all of what I would consider to be key parameters. These
> would include
>
> Vgs_min (= Vth)
> Rds_on
> Id max
> Vd max
> Pd
> ...
>
> Follow that with any number of esoteric extras.
> Having indicative price as a searchable parameter would be
> useful.


Might be worth trying farnell? theirs is..... better.. wouldn't say  
good ;)

2007\12\10@005007 by Apptech

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> Might be worth trying farnell? theirs is..... better..
> wouldn't say
> good ;)

I'm obviously missing something useful on the Farnell site.
Where do I find a parametric selector guide.
I can subset selections repeatedly but not in a very useful
way.

Is there a parametric search somewhere that I've missed?

Their PDF selector / selection guides are nice, but not what
I'm looking for.


       Russell

Several PDF selection guides

       http://nz.farnell.com/jsp/bespoke/bespoke7.jsp?bespokepage=farnell/en/ed_world/applications/app_selector.jsp

Power selection guide

       http://www.national.com/appinfo/power/files/PowerSelGuide.pdf

Amplifiers

       http://www.national.com/appinfo/amps/pdf/amp_selguide.pdf




2007\12\10@041037 by Ruben Jönsson

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You have to go into the on line catalogue and select Semiconductors -> Discrete
Devices -> Transistors -> MOSFET and then you get the parametric search.

<http://export.farnell.com/jsp/search/browse.jsp?N=1000055+500004>

{Quote hidden}

==============================
Ruben Jönsson
AB Liros Electronic
Box 9124, 200 39 Malmö, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
spam_OUTrubenTakeThisOuTspampp.sbbs.se
==============================

2007\12\10@055026 by Alan B. Pearce

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> A good start is searching for MOSFET at Digikey and then
> using their parametric search. However, this does not handle
> all of what I would consider to be key parameters. These
> would include
>
> Vgs_min (= Vth)
> Rds_on
> Id max
> Vd max
> Pd
> ...
>
> Follow that with any number of esoteric extras.
> Having indicative price as a searchable parameter would be
> useful.

I think you end up wandering down the lists of the various manufacturers.
International Rectifier can select on a whole range of parameters, I think
the Zetex one does as well.

Haven't gone browsing ST, Texas, Motorola, National Semiconductor or
anywhere else.

2007\12\10@075850 by Spehro Pefhany

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At 05:49 AM 12/10/2007, you wrote:
{Quote hidden}

Even searching on Rds(on) with a given Vgs is not easy.. if you want to
find (say) the minimum gate charge with a certain current rating and voltage
(and lowest cost among those contenders) you are stuck looking at a lot of
stuff, IME.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



2007\12\10@081143 by Apptech

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> I think you end up wandering down the lists of the various
> manufacturers.
> International Rectifier can select on a whole range of
> parameters, I think
> the Zetex one does as well.

I've just been trying to use IR's one.
Looked good.
First search said - too many devices selected etc.
Cut down the search - same result.
Stupid!!!
What I want is to do a guided subsetting depending on how
many hits I get.
At least Digikey's handles that well.

Best for my desires so far is FDN337 - which is what Mark
turned up independently a few days ago.

I'm speccing a 0.5 Watt to perhaps 1 W out boost converter
to run on 3 x NiCd or NimH.
Nominally 3V - 4V operation
Peak current is around 400 mA.

$US0.44/1

$US0.12368 / 12000 or $0.1218 / 1000 !!!! :-)
One obviously needs to buy them in batches of 1000 :-)

30V, 2.2A cont, 10A pulsed
SOT23

At Vgs = 3V and Id=1A Vds < 0.1 V which is highly
acceptable.
At that level even the 250 C/W junction to ambient would
work - giving 25C rise.
Even allowing for a bad case of reality it's a nice part for
many tasks up to rated current.

Even at 2A and 3V gate drive it has Vds about 0.15V typical.
That's approaching the thermal dissipation limit but OK with
good but easy enough PCB copper heatsinking.


       Russell

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