Electronics Forum | Fri Oct 05 07:31:29 EDT 2001 | furrer
When tenting vias almost a few vias are not covered completly by Solder Mask. Does this one side open vias affect the Immersion Tin Process ? Do we get chemical residues in the vias ?
Electronics Forum | Sat Oct 06 08:27:24 EDT 2001 | davef
Yes, some solder masks do not tent well, because the material is too thin. That�s the trade-off. Thin masks: * Conform well to [don't bleed onto] fine pitch features. * Tent vias poorly, requiring an additional "plugging" step. As you imply, if th
Electronics Forum | Fri Dec 17 14:30:42 EST 2004 | Dreamsniper
I goy this issue: Voids in almost every ball of my BGA's prcessed since we changed our BGA via tenting to double tenting. The tenting is done with a dry film application to fill the via from the solder side then apply LPI Mask on the surface of the
Electronics Forum | Fri Dec 17 14:31:52 EST 2004 | Dreamsniper
I got this issue: Voids in almost every ball of my BGA's processed since we changed our BGA via tenting to double tenting. The tenting is done with a dry film application to fill the via from the solder side then apply LPI Mask on the surface of the
Electronics Forum | Wed Sep 27 12:44:52 EDT 2000 | Ashok Dhawan
What could be possible resons for " Plating Crack on Barrel (tented via)" This tented via is in proximity to parts being hand soldered. The crack in barrel was detected on failure analysis - micro-section of via where barrel is having crack ( circul
Electronics Forum | Wed Jul 07 09:47:41 EDT 1999 | Peter Brant
| | Q #1) Is it more reliable to have the mask tent over the vias or risk getting vias half filled with solder? These are vias with an .020" hole and .040" or .050" pad. WIth regards to this question, and scott's follow up, I have used the "epoxy me
Electronics Forum | Fri Jan 21 19:30:11 EST 2005 | Dreamsniper
Hi T2, The purpose of this is that we want to make our rework robust. Whenever we rework BGA's we have solder getting trapped into those 1 sided tented vias and bet yah...they are hard to desolder! And during BGA resoldering these trapped solder will
Electronics Forum | Wed Feb 01 18:11:43 EST 2006 | Chris
I wonder if they are concerned about getting chemicals trapped in the tented vias. If the tented vias have pin hole openings or even larger openings, chemicals from the ENIG process could become entrapped in the via holes and not washed away in the
Electronics Forum | Tue Aug 18 10:18:22 EDT 1998 | Dave Hulbert
I have a question on tenting of vias on PWB's. I have designed a 6 >layer, military, mixed components (all on top side), LPI soldermask >board which will be run over the wave. I was planning on tenting vias >but did not specifically specify that on f
Electronics Forum | Mon Aug 31 14:03:41 EDT 1998 | Bill Childs
I have a question on tenting of vias on PWB's. I have designed a 6 | >layer, military, mixed components (all on top side), LPI soldermask | >board which will be run over the wave. I was planning on tenting vias | >but did not specifically specify tha
