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From: | "John Luciani (jluciani AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
Date: | Mon, 5 Feb 2024 14:05:58 -0500 |
Message-ID: | <CA+qhd=-oWHQTitmkLuZJ9NYEYb4GemXt-893phKgrvKMORgF+w@mail.gmail.com> |
Subject: | Re: [geda-user] Solder mask commands? |
To: | geda-user AT delorie DOT com |
Reply-To: | geda-user AT delorie DOT com |
--00000000000099f4080610a7277a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I have never been asked to set soldermask oversize to zero. This seems to me like a design decision that the PCB designer should be making based on component specifications and process capabilities. I would expect the PCB manufacturer to perform a DRC against their process capabilities and report violations to the PCB designe= r for correction. Most of my footprints I do are in the 4 - 5mil oversize. However, with a lot of the newer QFN and BGA parts I need to go to 2 - 3mil. John L On Mon, Feb 5, 2024 at 6:11=E2=80=AFAM Richard Rasker (rasker AT linetec DOT nl) [= via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote: > I submitted the modified board, and all is well now -- but I still got > into a bit of a discussion about this solder mask oversize/expansion thin= g. > > I remarked that this was the first time in many decades that I was asked > to set the solder mask oversize to zero, however the person from the PCB > house said that zero oversize has been the industry standard for at > least 20 years, ever since the lithographic workflow wasn't exclusively > based on photographic films any more. But when I look up best design > practices for various PCB design packages and other sources, I still see > a small (usually 4 mil) expansion size mentioned. > > So what is it? Would it be a good idea to henceforth use zero oversize > solder masks? What do people around here do? > > Thanks for any thoughts. > > Richard > > --00000000000099f4080610a7277a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>I have never been asked to set soldermask oversize to= zero. <br></div><div>This seems to me like a design decision that the PCB = designer</div><div>should be making based on component specifications and p= rocess</div><div>capabilities. I would expect the PCB manufacturer to perfo= rm a DRC</div><div>against their process capabilities and report violations= to the PCB designer</div><div>for correction.<br></div><div><br></div><div= >Most of my footprints I do are in the 4 - 5mil oversize. However, with a l= ot of <br></div><div>the newer QFN and BGA parts I need to go to 2 - 3mil. = <br></div><div><br></div><div>John L<br></div></div><br><div class=3D"gmail= _quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Feb 5, 2024 at 6:11= =E2=80=AFAM Richard Rasker (<a href=3D"mailto:rasker AT linetec DOT nl">rasker AT lin= etec.nl</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delori= e.com</a>] <<a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT c= om</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi= n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex= ">I submitted the modified board, and all is well now -- but I still got <b= r> into a bit of a discussion about this solder mask oversize/expansion thing.= <br> <br> I remarked that this was the first time in many decades that I was asked <b= r> to set the solder mask oversize to zero, however the person from the PCB <b= r> house said that zero oversize has been the industry standard for at <br> least 20 years, ever since the lithographic workflow wasn't exclusively= <br> based on photographic films any more. But when I look up best design <br> practices for various PCB design packages and other sources, I still see <b= r> a small (usually 4 mil) expansion size mentioned.<br> <br> So what is it? Would it be a good idea to henceforth use zero oversize <br> solder masks? What do people around here do?<br> <br> Thanks for any thoughts.<br> <br> Richard<br> <br> </blockquote></div> --00000000000099f4080610a7277a--
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