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Re: KLC - courtyard

 

It will however be up to the user to adjust the clearance according to the
inserter used, if that's the case.

On Thu, Jan 15, 2015 at 2:36 AM, Lorenzo Marcantonio <
l.marcantonio@xxxxxxxxxxxx> wrote:

> On Wed, Jan 14, 2015 at 09:04:59PM -0500, Carl Poirier wrote:
> > It's pretty simple. They are proposing a nominal courtyard excess of
> 0.25mm
> > for all THT components. All in all, I would amend rule 6.6 to the
> > following, breaking it down into two rules:
> >
> > - Courtyard line has a width 0.05mm. This line is placed so that its
> > clearance is measured from its center to the edges of pads and body.
> > - Courtyard clearance is 0.25mm, except for components smaller than 0603
> at
> > 0.15mm, aluminum capacitors and connectors at 0.5mm and BGA at 1.0mm, all
> > rounded on a grid of 0.05mm. (IPC-7251, IPC-7351)
> >
> > The connector clearance comes from *PCB Design Optimization starts in the
> > CAD library*. Any comments before I edit the KLC?
>
> THT courtyard is not critical, usually. In my experience it's more an
> issue of 'leave enough space for the heat to get out' or 'keep the
> clearance for high voltage'. If you look at the example for axial part
> it also follows the wire/barrel contour which is IMHO bad practice (I
> see 'nesting' components as a last resort to recover board estate...)
>
>
> --
> Lorenzo Marcantonio
> Logos Srl
>
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