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From: email@example.com (Bill Allison)
Subject: Re: Help - Power mosfets - difficult load
Date: 23 Oct 2002 04:25:02 -0700
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 23 Oct 2002 11:25:02 GMT
"Phil Allison" wrote in message news:...
> "Mike Harding" wrote in message
> Phil wrote:
> > >
> > > ** Ouch - what pack are they in?? I can't seem them in my
> > SOT 227. Page 1/863 of the current Farnell catalog. Although they
> > list them in the price column I cannot find them in the spec. column!?
> > But the datasheet is at www.irf.com
> ** The only $123 device is the (IR) FB180SA10 which is not
> The one Bill mentioned, IRF3703, is not there at all. If he
> in fact meant the IRFP3703 then that is priced at $27.60 and that is also
> not described.
> So what is the device?
> Regards, Phil
Firstly - I apologise - looking back through the posts I do seem to
come across as "know-it-all". But that's not where I'm coming from -
I'm just one of those who tends to worry at a subject like a dog with
a bone until I'm sure as sure can be that there's nothing left to
find. I have learned from you all here and there and i'm grateful for
In my defense, you guys are used to thinking of the *overall* efficacy
of a solution - my focus has to be different - to minimise risk to
(dissipation etc in) the one expensive component of this project - the
fets. That I sacrifice some overall efficiency doesn't matter a lot to
me as long as the whole still works.
To clarify on devices - I originally considered paralleling (probably
6)IRF3703s at $4.78 (part number and price from www.irf.com) but i
don't like the packaging, and suspect a risk associated with one
device out of 6 taking an unfair share of stress e.g. if it should
switch on earlier or off later and with John P's guidance have ended
up deciding on a pair of FB180SA10s at $35.85 each (plus 175BGQ030
Shottkys). More expensive but a bigger margin of safety.
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