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From: "Spehro Pefhany"
Subject: Re: What are these terms in PCB design?
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Thu, 03 Oct 2002 18:16:38 GMT
NNTP-Posting-Date: Thu, 03 Oct 2002 14:16:38 EDT
The renowned The little lost angel wrote:
> Top layer, bottom layer... which's the side the solder's on? I think
> it's the bottom layer. So if I am making a one layer PCB, I should put
> my traces and pads on the bottom and the PCB makers will know which
> way it should face?
Ah, well, traditionally I think single-sided boards have been laid out as
if you are looking at the bottom of the board, and all others have been
laid out as if you are looking at the top (the side opposite the solder).
I think today, it probably has switched to laying the board out looking at
the component side even for single sided boards. In any case, I'd call the
part with the traces the "bottom", whether it was laid out reversed or
not, so your file with the traces should be named appropriately or
referenced in your readme file.
DON'T depend on the name alone. Put some text on the board that is
"right-reading", so they can flip the layer if required to get it right.
It can be a PITA to have to put parts in the wrong side (made that mistake
ONCE on a prototype single-sided board). ;-)
> Plus, the PCB programs have this thing call pour/fill, is this what I
> use if I want to fill up an entire empty area with copper to act as a
> heatsink for a LED that's connected immediately to that trace?
Yup. But make sure your program uses "thermals" to make the soldering
easier (the good ones do, and automatically).
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