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'[EE]: SMD standard package overview'
2003\05\07@105929 by Tal

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Does anybody know a good overview of standard surface mount packages ?

Something that give general information about each, what it is typically
used for, what its name means (e.g. 0804 or SOT23), the pros and cons of
each, etc.

Thanks,

Tal

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2003\05\07@111516 by daniel_sweet

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The intersil website has some details about their packages, useful for identifiers

http://www.intersil.com/design/packages/plastic.asp

DAN
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2003\05\07@113614 by Alan B. Pearce

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>Something that give general information about each,
what it is typically used for,

I do not think there is any standard usage, it depends on what package the
manufacturer decides to use :)))

>what its name means (e.g. 0804 or SOT23),

Not many packages have meaningful names. About the only ones that do are the
resistor packages you mention, where the package "name" is the package
dimensions (XY) in tens of thousands of an inch, the largest common one
(without going to power resistors which can be larger) is 1208 which is
0.12" x 0.08", and its metric equivalent 3216 which is 0.32mm x 0.16mm. Some
manufacturers quote package size in imperial, others metric, but the two
seem to be standard, down to 0201 in imperial dimensions.

For other packages, you need to refer to the JEDEC and equivalent European
standards. However you will find that almost all manufacturers will include
the package dimensions on the data sheet, but some (like TI and Maxim) have
it as a separate sheet that they refer you to. Sometimes it is just referred
to by the JEDEC number, which is typically something like MS-012-AA (which
is an SO-8 package).

Once you get a feel for the package families it is not too bad, but often a
chip is available in multiple possible packages. The SO- package series is
like a scaled down DIP. The TSSOP packages tend to be a longer package with
all the leads coming off the ends, on a very fine pitch, often used for
memory devices (static ram and flash prom).

Then there are the variations on a particular package. The SO- series are
set up with a 0.15" width, but then there is the wide SO- series which seem
to come in a number of widths, the common one being 0.3".

>the pros and cons of each, etc.

Well this depends on who you talk to. The biggest problem seems to be
cellphone/PDA/Notebook computer manufacturers who keep wanting to put ever
more into ever smaller items, and so the component manufacturers keep making
ever smaller packages :)) It is an evolving world.

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