On Sun, Jun 08, 2003 at 11:34:39AM -0800, Bob Paddock enlightened us
thusly
>
>
> I'm looking for data sheet for a GE SCR's that I cannot find any info
> on.
>
> GE E2395852 U737
>
> It's a stud mounted SCR, I'm guessing about 40 amps or so.
>
>
There are a surprising number of batch numbers about in SCRs. Many are
for some tweak that the manufacturer was asked for. A surprising number
just have the corners rounded on the hex so it will fit in a tighter
area, but testing for tighter specs (dv/dt, switching times, min gate
current, etc) is not unusual either.
This is where a lowlife techie proves vastly superior to an engineer.
The engineer hgas to know what is was, so he can specify an exact
equivelant; The techie doesn't give much for what it was, but opens his
favourite catalog supplier's book at the `SCRs' page. Having found a
suitable voltage overhead (guesswork) you decide on dv/dt, etc this way.
If your scr is on mains inputs, forget it. If it's switching, pick a
switching device, because if the catalog gives you switching data on
their scr, it's probably good enough. Don't read the specs - that just
wastes time. Use the largest current that package provides, and specify
that device.
In 13 years, I've never been caught out on an scr this way :-). I did
specify certain switching applications slightly more seriously, to be
fair, but that's about it.
--
With best Regards,
Declan Moriarty.
--
Author: Declan. Moriarty
INET: [EMAIL PROTECTED]
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