My board assembly shop said that vias in pads would need to be plugged. I have done it with a HASL board many times before without problems but most of those were hand assembled, it's easier to add more solder if it wicks through the board. I've recently started using ENIG for all of my boards and the holes are much cleaner than they were with HASL. I would be more worried now than I was before.
The bottom line for me is that I no longer do via-in-pad. I would in a pinch but the board fab will be higher. Regards, David Kearney -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darcy Davis Sent: Monday, September 26, 2005 2:33 PM To: PEDA (E-mail) Subject: [PEDA] Micro Vias We're heading into new territory for us and so looking into using micro vias. Currently we're using 10/26mil (drill/annular ring) vias, but we're still finding that the via's are consuming too much placement room. My understanding is that with micro vias, we can punch a hole right through a pad and still be OK through reflow. Does anybody know otherwise? Since micro vias will be laser drilled (I assume), they can only go between two adjacent layers, right? Is there typically a specific size of hole that must be used, or is there just a minimum hole size requirement? Are there any other limitations to this technology that I may not have thought of? All else being equal, does anyone know what the cost differential would be for a board with micro vias vs. our current 10/26mil vias? Thanks again, Darcy Davis Design Engineer ========================================================= Dynastream Innovations, Inc. Ph: (403) 932-9292 ext. 132 228 River Ave. Fax: (403) 932-6521 Cochrane, AB T4C 2C1 Web: www.dynastream.com Canada ========================================================= ____________________________________________________________ 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]
