kicad-lib-committers team mailing list archive

[Lorenzo Marcantonio <l.marcantonio@xxxxxxxxxxxx>]

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
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