Electrical layout and property requirements dominate space considerations. Without being intimate with your design, in terms of whether it is digital, analog, or mixed-signal, power, instrumentation, general purpose, etc, the ratio of through-hole to smt and the distribution of thru-hole vs smt (a 20-pin thru-hole part is significantly larger than its smt brethren),etc, etc, etc, I would have to keep my advise to this...If you don't have some mandated geometric constraint to work from, lay the board out, then determine its area, don't try to determine the area before layout. That, IME, is simply putting the proverbial cart before the horse.
regards, aj >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Steve Allen >Sent: Thursday, June 02, 2005 4:41 PM >To: [email protected] >Subject: [PEDA] Req'd Board Area > >Hello All, >I've struggled over the years to determine the required area >for my board designs. Typically, I add up the area required >for all the land patterns and multiply the area by a scaling >factor. I adjust the scaling factor based on the details of >the design. The scaling is adjusted by my gut feeling. > >Currently, I have a mixed package (through-hole and SMT) with >549 parts. I need to keep both assembly and materials costs >down. That means 4 layers or less and all components on a >single side. There's a number of traces that will need to be >fairly wide (.05in) and an area where I'll have to pour large >sections of copper. There are a number of connectors. Land >Pattern Area = 44.5 sq. in. > >Here are my guesses: >2-layer >Difficult = 115 sq. in. >Medium = 125 sq. in. >Easy= 135 sq. in. > >4-Layer >Difficult = 105 sq. in. >Medium = 115 sq. in. >Easy= 125 sq. in. > >Is this reasonable? Any other ideas? > > >Thanks, >Steve > > > > >____________________________________________________________ >You are subscribed to the PEDA discussion forum > >To Post messages: >mailto:[email protected] > >Unsubscribe and Other Options: >http://techservinc.com/mailman/listinfo/peda_techservinc.com > >Browse or Search Old Archives (2001-2004): >http://www.mail-archive.com/[email protected] > >Browse or Search Current Archives (2004-Current): >http://www.mail-archive.com/[email protected] > > This e-mail transmission and its attachments may contain information that is proprietary, privileged and/or confidential and is intended exclusively for the person(s) to whom it is addressed. Any use, copying, retention or disclosure by any person other than the intended recipient or the intended recipient's designees is strictly prohibited. If you have received this message in error, please notify the sender immediately by return e-mail and delete all copies. ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
