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Article #2277Re: PCB - Pads size
From: David L. Jones
Date: Sun, 06 Apr 2003 12:09
Date: Sun, 06 Apr 2003 12:09
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2361 bytes
Bobby Mc Craig <bobby_mc_craig@yahoo.ca> wrote in message news:<Xns9354D9440FB3Alatourrsympaticoca@207.35.177.134>... > I'm designing a PCBoard and I need some advices... > > What should be the relation between the pin diameter, the drill size and the > pad size? All manufacturers will have a recommended pad to hole ratio spec. This is typically 1.8, so the pad should be 1.8 times larger than your hole size to allow for any drilling offset errors and plating. You can go less than this if you need to (check with your manufacturer), but it's a nice rule of thumb. Drill sizes are most often specified in "finished" hole diameter which includes the plating through the hole. So if you specify a 0.8mm hole then thats what you should get, but manufacturers vary on this and it can be a big potential problem, so check with them first. Typically specify your hole at least 0.1mm extra over the pin size you will be using. Don't try and get a 0.8mm pin into a 0.8mm hole. Regards Dave :)
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,78a9476d83d2eefa X-Google-Attributes: gid112d1e,public X-Google-Thread: 112e71,78a9476d83d2eefa X-Google-Attributes: gid112e71,public X-Google-Thread: 103407,78a9476d83d2eefa X-Google-Attributes: gid103407,public X-Google-Thread: 1118be,78a9476d83d2eefa X-Google-Attributes: gid1118be,public X-Google-Thread: 107cee,78a9476d83d2eefa X-Google-Attributes: gid107cee,public X-Google-Thread: 111d0a,78a9476d83d2eefa X-Google-Attributes: gid111d0a,public X-Google-ArrivalTime: 2003-04-06 05:10:01 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!postnews1.google.com!not-for-mail From: tronnort@hotmail.com (David L. Jones) Newsgroups: sci.electronics.design,sci.electronics.misc,sci.electronics.basics,de.sci.electronics,aus.electronics,sci.electronics.components Subject: Re: PCB - Pads size Date: 6 Apr 2003 05:09:59 -0700 Organization: http://groups.google.com/ Lines: 20 Message-ID: <7de449f7.0304060409.14861ad0@posting.google.com> References: <Xns9354D9440FB3Alatourrsympaticoca@207.35.177.134> NNTP-Posting-Host: 203.213.84.151 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1049631000 20286 127.0.0.1 (6 Apr 2003 12:10:00 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: 6 Apr 2003 12:10:00 GMT