Electronics Forum | Wed Jan 17 09:32:09 EST 2007 | Jeff
Hi, I am having problems reworking a lead free PBGA (23mm x 23mm, 1mm pitch). The board is relatively small (5" X 4" X 0.063"). During the removal stage, a thermocouple was placed at the solder ball level (between the board and underneath of compo
Electronics Forum | Sat Mar 24 07:07:52 EDT 2007 | stefi
Hi, Thanks for the reply, The fiducial which posed problems is a 1 mm diameter gold plated circle fiducial. The problem with this is that the vision system sees it darker than the surrounding area. The surrounding area is all copper covered with th
Electronics Forum | Sun Jul 26 06:31:07 EDT 2009 | hohk
Hi everyone, I need to connect a cylindrical disc device (piezo ceramic sensor) to the PCB trace without using high temp solder. I plan to use "3M™ XYZ-Axis Electrically Conductive Adhesive Transfer Tape 9719" to connect the device to the PCB trace
Electronics Forum | Tue Jul 28 20:11:14 EDT 2009 | hohk
Thanks Davef! 3M's product description of "3M™ XYZ-Axis Electrically Conductive Adhesive Transfer Tape 9719 is suitable for attaching low surface energy (LSE) EMI shields to electronic and electrical devices where high temperature (up to 400C) is re
Electronics Forum | Wed Jun 08 10:57:20 EDT 2011 | pcbrookie
We recently got our last BGA X-Ray results back (no X-ray in house yet) and had more than one board/BGA look like the attached image. The balls on one corner are completely collapsed (so much so that bridges appear) and raised on the opposite corner
Electronics Forum | Thu Mar 25 19:07:22 EDT 2021 | llawrence
That is all a lot to take in, but thank you all for the recommendations. From what I understand, I'm going to start by ordering a new polished 0.1mm stencil with size reduced apertures and seeing if reduced paste deposit will help. As for the sten
Electronics Forum | Thu Apr 29 10:24:15 EDT 2021 | oxygensmd
I have the same issue but with one customer only. All the other have smaller or more difficult QFPs with really low bridging issues - close to no-one. I think the PCB and PCB design also an issue - other customers are using 32/64/100/144 QFPs and we
Electronics Forum | Wed Oct 06 04:23:09 EDT 1999 | Brian
| | I am a new employee at a company that has had a large turnover of employees over the past year. I am working on a board (components on one side only), the engineer (he is also new ) wants to use an .035 pad with a .021 dia. hole, there are no via
Electronics Forum | Tue Dec 14 22:17:33 EST 1999 | Dave F
Armin: How ya doin� bud? CK gives good advice, but I'd like to take a bit of a different angle. Q1. For 0.7 mm (0.027in) diameter hole for vias, what�s the minimum annular ring for this hole diameter? Depends on what you�re trying to do. For in
Electronics Forum | Fri Sep 17 04:17:10 EDT 1999 | Brian
| | | I am not familiar with the "mil" metric. How many inches is in 1 mil? | | | | | | ...or 10 mil? | | | | | | | | each mil = .001" | | | | Earl Moon | | | At risk of informing someones grandmother on the art of removing the contents of an e
