[sdiy] PCB Layout terminology

[Happy Harry]

You need some data books !
(preferably old ones that have less surface mount parts)

There is a designation called JEDEC (Joint engineering something...blah 
blah...?)

They have standard package outlines... like

TO-18  (transistor outline) a small metal can
TO-5  a bigger metal can size of a pencil eraser
TO-3 a power package in a pork pie hat shaped metal can

TO-92  a common small transistor plastic package
TO-220 a power transistor package with a metal tab... some voltage
regulators come in this package.

You start with the device number, look up a data sheet, then select the 
correct package.

Yes the 2N3904 / 3906 come in the TO-92 package... but any small transistor 
might be housed in the same package.

H^) harry


>From: Mountain Man <mtman at cloud9.net>
>To: synth-diy <synth-diy at node12b53.a2000.nl>
>Subject: [sdiy] PCB Layout terminology
>Date: Thu, 29 Mar 2001 17:33:16 -0500
>
>I'm continuing my quest for a usable and inexpensive PCB layout and
>schematics program.  I've downloaded about a dozen demos and shareware
>programs from the net.  Some of them look like they might be quite usable,
>but I'm getting hung up on not knowing the lingo.  I'm no longer scared off
>by part numbers like "2N3904" (I seem to be getting quite friendly with 
>these
>guys in fact), but suddenly I'm now confronted with designations like TO-92
>(I *think* that goes with the 3904!).  I can't figure out how to go from 
>the
>parts list/schematic to these layout designations.  Are there "translators"
>available?  A good website, perhaps?
>
>If I do find software packages that look good, I'll be sure to report here.
>So far, nothing has popped out as the obvious candidate.
>
>Thanks for your help,
>Elby
>

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