Due to these problems BGAs are the only parts that will remain leaded even on a PB-free board.
Mira --- Dennis Saputelli <[EMAIL PROTECTED]> wrote: > that is a good point > in fact i have been wondering about how to clean > under these things, it > has been my understanding that for BGAs the > preferred process is > no-clean because water is 'too big' and solvent is a > no-no > again, how does all this relate to lead-free ? > i think LF needs a more aggressive flux, correct ? > > ds > > _______________________________________________________________________ > Integrated Controls, Inc. Tel: > 415-647-0480 EXT 107 > 2851 21st Street Fax: > 415-647-3003 > San Francisco, CA 94110 > www.integratedcontrolsinc.com > > > Brad Velander wrote: > > Dennis, > > Actually there was a little bit of both via in > pad and dog bone involved. Throw into the mix that > we have a fabricator telling us that we must stop > tenting our vias because it is resulting in board > contamination post cleaning (the cleaning water > contaminating the boards when it is not completely > removed from the blocked via holes) and you can see > the problem coming at you like a freight train. > > > > The via size issue came to me from one of our > engineers, I haven't seen the articles myself, that > would be the next step, see if I can actually see > the articles and quantify the precise case and > conditions they are discussing. > > > > Sincerely, > > Brad Velander > > Senior PCB Designer > > Northern Airborne Technology > > #14 - 1925 Kirschner Road, > > Kelowna, BC, V1Y 4N7. > > tel (250) 763-2329 ext. 225 > > fax (250) 762-3374 > > > > > > > > -----Original Message----- > > From: Dennis Saputelli > [mailto:[EMAIL PROTECTED] > > Sent: Thursday, December 08, 2005 8:47 AM > > To: Protel EDA Discussion List > > Subject: Re: [PEDA] Via Solder Thieving, heard of > this? > > > > > > > > Hi Emanuel, > > > > i think what you are writing about here is a > different issue than we > > were discussing > > > > i believe the discussion was about having the via > inside the BGA pad > > itself, not the 'dogbone' via typically used to > fan out the BGA pad > > this is often called 'via in pad' > > > > if the via inside the BGA pad is small enough the > solder paste will not > > flow through it > > > > the topic is at what size this is good practice > > > > i would call what you describe here more something > like 'bridging' than > > 'theiving' > > > > i would yell at your fabricator > > these days there is no room for sloppy solder mask > registration > > > > Dennis Saputelli > > > > > > > ____________________________________________________________ > > 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] > > > > > > > ____________________________________________________________ > 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] > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ____________________________________________________________ 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]
