can you explain pattern plating ? i thought it was using the tin/lead plating as etch resist
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: > Jon, > Sounds like you had soldermask that wasn't over bare copper. With the > SMOBC you shouldn't have that problem. With solder plated traces (some fabs > used to use that as their etch resist, I didn't know anybody was still doing > it) under soldermask you will definitely have that problem. > Regardless, if you specify SMOBC this shouldn't happen to you. > Otherwise it is exhibiting poor mask adhesion or something in your assembly > processing is out of whack. > > Pattern plating is whole other fish that isn't related to finishing or > soldermask. > > 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: Jon Elson [mailto:[EMAIL PROTECTED] > Sent: Wednesday, January 18, 2006 11:52 AM > To: Protel EDA Discussion List > Subject: Re: [PEDA] Solder Masks for vias. > > > > > Brad Kosiance wrote: > > >>For a via that is close to a surface mount pad I need the solder mask to >>cover the via so that the via does not steal the solder away. >> >>Is the best way to do this to set the Solder Mask Override setting to a >>negative number (i.e. -20mil)? >> >> > > Are you sure this actually works? I have seen the solder flow under the > solder mask, making the solder mask "float" over a big "bubble" of > solder. It probably makes a big difference whether the PCB technology is > SMOBC or pattern plating. > > Jon > > > ____________________________________________________________ > 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]
