Because that's what IPC-7351B says about can components. I don't think they include the THT cans in this standard, but Lorenzo can confirm that one. (Or anyone else with access to the documents)
On Thu, Jan 15, 2015 at 4:32 PM, nnn <[email protected]> wrote: > I don't understand the exception for aluminum capacitors. Does it apply > to both THT and SMD? Why clearance for THT capacitors should be greater > than clearance for other THT? > > W dniu 15.01.2015 o 03:04, Carl Poirier pisze: > > 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? > > On Wed, Jan 14, 2015 at 8:22 PM, Carl Poirier <[email protected]> > wrote: > >> Thank you very much Lorenzo. I will come up with some adjustments to the >> KLC. >> >> On Tue, Jan 13, 2015 at 2:26 AM, Lorenzo Marcantonio < >> [email protected]> wrote: >> >>> On Mon, Jan 12, 2015 at 09:39:44PM -0500, Jean-Paul Louis wrote: >>> > > Thanks for the information. I have looked at some videos. Are you >>> aware of some guidelines for THT courtyards? >>> >>> Here you go for THT: >>> >>> http://www.ipc.org/committee/drafts/1-13_d_7251WD1.pdf >>> (yes, eternal draft:D) >>> >>> -- >>> Lorenzo Marcantonio >>> Logos Srl >>> >>> -- >>> Mailing list: https://launchpad.net/~kicad-lib-committers >>> Post to : [email protected] >>> Unsubscribe : https://launchpad.net/~kicad-lib-committers >>> More help : https://help.launchpad.net/ListHelp >>> >> >> > > > > > -- > Mailing list: https://launchpad.net/~kicad-lib-committers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~kicad-lib-committers > More help : https://help.launchpad.net/ListHelp > >
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