Resolution 1 is what being used these day's... Even tent component side and have solder side with drill size plus.15mm has been done on ENIG designs... Should be good for HASL -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Sanchez-Benavides, Erika Sent: Thursday, May 31, 2007 10:10 AM To: [log in to unmask] Subject: [DC] Plated thru hole vias covered with soldermask on both sides with HASL Hi! Due to the wave soldering process for PTH components, our assembly process guideline indicate to cover vias with soldermask in those areas. But as you know, Plated thru hole vias covered with soldermask on both sides with HASL solder or other manufacturing chemicals might be clogged in the vias and out-gas (blow out) during assembly or remain in the hole and corroid the copping in the via. There are two suggestions from our PCB suppliers: Resolution1: PCB supplier to add a clearance to the soldermask: (drill size plus.15mm). With this option, we are not going to have the via covered, but I am not sure if this is enough to avoid problems (pearls, solder passing through the via...) during wave soldering process. Resolution2: PCB supplier will tent the vias on both sides by adding a barrel relief to prevent their assembly problems. In your opinion, what would be the best option? Is there an alternative option you may see? Thank you very much in advance, Erika E. Sanchez Siemens VDO Guadalajara Development Center E-Mail: [log in to unmask] Internet: http://www.siemensvdo.com ------------------------------------------------------------------------ --------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------