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From: DaveC on 9 Jun 2010 16:21
>> Thats your answer, grab the data sheets. ;-)


> That's what I resort to, although it really would be nice if there was a
> one stop shop of package drawings or dimensions. There are so many
> different packages now that I can't keep track of them all.


For example this datasheet has 5 different package drawings that it calls
"Small Outline Package", all with different dimensions:

<http://focus.ti.com/lit/ds/symlink/sn74hct244.pdf>

Isn't the idea of a package "name" supposed be a single identity including
dimensions (differing, of course, in length, to accommodate different pin
counts)?

From the same manufacturer, no less...

Thanks,
Dave

From: Tim Williams on 9 Jun 2010 16:26
"D Yuniskis" <not.going.to.be(a)seen.com> wrote in message
news:huorbt$e23$1(a)speranza.aioe.org...
> Many packages are just "nominally" dimensioned. Manufacturers
> often come up with "modified standard packages" with slightly
> different dimensions, etc.

I recently purchased some shoulder washers, which appear to fit every TO-220
drawing I've found. In actuality, they only fit about half the TO-220's
I've tried them in. Figures.

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms


From: DaveC on 9 Jun 2010 16:28
> http://www.fairchildsemi.com/packaging/

According to this source, the same package (listed in the TI datasheet as
"SOP") might a large SOIC-20:

<http://www.fairchildsemi.com/products/logic/packaging/soic20.html>

Am I the only one confused?

From: Michael A. Terrell on 9 Jun 2010 16:49

DaveC wrote:
>
> > http://www.fairchildsemi.com/packaging/
>
> According to this source, the same package (listed in the TI datasheet as
> "SOP") might a large SOIC-20:
>
> <http://www.fairchildsemi.com/products/logic/packaging/soic20.html>
>
> Am I the only one confused?


Probably. :)

SOP = Small Outline Package

SOIC = Small Outline IC


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
From: James Sweet on 9 Jun 2010 17:00
DaveC wrote:
>> http://www.fairchildsemi.com/packaging/
>
> According to this source, the same package (listed in the TI datasheet as
> "SOP") might a large SOIC-20:
>
> <http://www.fairchildsemi.com/products/logic/packaging/soic20.html>
>
> Am I the only one confused?
>


That's another problem, there are special package types that are called
different things depending on the manufacture.

I've recently worked on some designs around TI chips in their "PowerPAD"
packages which are SOIC and SSOP equivalent but with an exposed metal
pad under the die, and of course different names. I've gone to just
ignoring all the packages included in the PCB software and drawing my
own from the datasheet of each part I use, it's less hassle in the long run.
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