Re: transistor parametric data---where?

On Tue, 08 Apr 2008 06:11:29 GMT, przemek klosowski
<przemek.klosowski@xxxxxxxxxxxx> wrote:

On Mon, 07 Apr 2008 17:09:36 +1000, Alan Peake wrote:

przemek klosowski wrote:
I thought it would be easy to find a compilation of transistor data
listing the basic parameters (VCEmax, hFE, VCEsat, Pmax, fmax, ICEmax,
etc), for at least the basic types (2Nxxxx, BCxxx).
..........
Have you tried:

http://www.datasheetcatalog.com/

Yes, I do realize that one can find the individual datasheets. I was
looking for a compilation of the data, for instance to sort it by the
saturation voltage and/or by speed, to find the best switchers. It was
a surprise to me---are not the standard type designators (e.g. 2N2222)
supposed to refer to 'identical' parameters? and if so, I am somehow
surprised that there isn't a list somewhere, just like there's a list
of 74xxxx TTL chips.

Individual manufacturers (IR for instance) have parametric searches for
their own product line that may even show rough pricing, but you just
have to know which ones are worth searching in. This newsgroup quite
often carries dialogs like
"I am using the xyz part, but it doesn't do abc"
"Try the uvw part, it has a higher fghi and is cheaper"
which is great if someone has the answer, but is so... manual.. and
even then the well-informed people are sometimes suprprised by new parts.

I could almost see a giant data***-scraping script that collects
this information continuously into a large table on the web, but then I
think of all the crazy formatting variations of data*** tables and I
snap out of it.

It is strange, the JAN and JANTX 2N#### series are regulated by JEDEC
you might be able to compile some of what you want from the hundreds
or more of "/" sheets. There is a similar body for Japanese 2SX####
(JIS) series with the same problem. from this i expect that there is
a similar body for the BXX#### series parts with similar constraints.
Moreover read the specifications carefully, there is no real general
guarantee of interchangeability in 2NXXXX, 2SXXXX or BXX### series
parts.
.