Electronics Forum: copper filled vias (Page 1 of 37)

Conductive filled Vias on BGA

Electronics Forum | Fri Oct 08 09:43:27 EDT 2004 | davef

First, don't get too excited about the thermal capabilities of conductive epoxy. An epoxy like DuPont CB-100 increases the amount of heat conducted through the barrel, but many over estimate what it can do. Calculations show for a 0.020" drilled

Conductive filled Vias on BGA

Electronics Forum | Fri Oct 08 07:38:48 EDT 2004 | Paddy

Hello, I am wondering if anybody has process experiance of designs which use the above. I understand that the filled via is an excellent thermal cnductor, which is great from a design point of view, but how do these solder through the reflow ovens

Conductive filled Vias on BGA

Electronics Forum | Wed Nov 30 12:44:54 EST 2005 | ppwlee

Dave, Do you know if such thermal transfer study with CB-100 (or equivalent) is available for review? My customer is pursuing this option and I am curious on how much improvement I would see by specifying a conductive via fill on the board. Rgds, P

Conductive filled Vias on BGA

Electronics Forum | Wed Nov 30 22:25:03 EST 2005 | davef

The authors of this article might get you started http://www.protoengineering.com/documents/viaplug.pdf Other information is: * http://www.dupont.com/pcm/techinfo/general/general9.html *

Cracked vias

Electronics Forum | Sun Dec 15 22:31:43 EST 2002 | craigj

Has anyone heard of vias cracking (barrel from pad) when being wave soldered. Was told this was a big problem by contract pcb designer, he always tent vias because of this. The reason was that the solder filling the vias caused stressing and then sep

Cracked vias

Electronics Forum | Mon Dec 16 09:36:54 EST 2002 | russ

I have never had this problem. It sounds like you are right in imagining that there must have been a bad supplier of PCBS or an inadequate design rule being followed, or a very bad wave process to have this cracking over wave solder. Some books requ

printing solder paste on test vias

Electronics Forum | Fri Aug 22 09:41:49 EDT 2003 | davef

Mantis: Kenny reflows paste on [wave solders] all via, not just the test via, to plug the via and provide for a pressure seal between the board and the test fixture. Beyond that, since solder is softer than copper [and fills the hole better], solde

High Freq. RF grade ceramic filled PTFE PCB material

Electronics Forum | Fri May 25 08:06:19 EDT 2007 | davef

Soldering PTFE boards * Exposure to the high temperatures needed for solder reflow poses no problem of loss of peel strength since the exposure times are relatively short. * There are many different types of PTFE based products that may perform diff

Tented vias on ENIG boards

Electronics Forum | Mon Feb 06 10:02:14 EST 2006 | Yash Sutariya

Sorry. I actually should clarify those slides. Black pad is not associated with tented vias. Also, you can tent vias with soldermask, but this requires the immersion gold process to be completed prior to soldermask. As such, all copper features (

Lead free tin copper only

Electronics Forum | Mon Feb 06 13:00:51 EST 2006 | amol_kane

Hi all, I just wave soldered 40 boards (20 if Imm Sn and 20 of Imm Ag) using SAC 305 (in this case the wave machine manufacturer (electrovert) suggested the alloy too). plan to carry out x-sectioning to see the results. overall, just from the visual

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