Comments in text: > -----Original Message----- > From: Robison Michael R CNIN [mailto:[EMAIL PROTECTED]] > Sent: Thursday, 21 February 2002 9:37 AM > To: 'Protel EDA Forum' > Subject: [PEDA] how does smt work ?? > > > hello, > > well, thats a pretty dumb question, isn't it? hahaha. > but i'm serious. i'm trying to reproduce a board which > has smt top and bottom, and it appears that some of the > smt pads overlap from top to bottom.
There are no dumb questions - just dumb people. :-) > > so how do smt pads work? on a thru-hole, they obviously > go thru the entire board. how far does a pad go thru as > an smt? obviously it has to at least burrow thru to any > layer it runs on, but do top and bottom overlapping smt > pads necessarily net together? i'm confused. An SMT pad exists on one signal layer only. To connect between signal layers (top and bottom for example) vias are needed. > > let me state that i realize many complex things are > possible (blind and buried vias come to my mind), but > somehow i don't think this is the case with this board. > but i'm not sure. > The reason you may not notice the vias is that they may be tented (covered with solder mask) or under the component (bad design practice). > thanks, miker > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
