Electronics Forum | Wed Jul 08 16:28:25 EDT 2020 | duchoang
OSP board finish is the issue. With OSP microBGA board, we need to have enough paste (enough flux) on pads (small pads on BGA), also we need to have strong, more activate flux to get rid of Preservative layer on top of pads. In this case, the OSP did
Electronics Forum | Mon Sep 10 23:13:08 EDT 2007 | weehn
hi, i'm from the semicon (BGA assembly). Could you advice what is the best method / procedure to remove OSP coatings from pads of the BGA substrates. thanks Wee
Electronics Forum | Fri Aug 11 14:50:35 EDT 2000 | Doug Philbrick
Any Motorlla Guru's out ther know, or can say, if Mot is mandating a change away from Gold / Nickel and going to OSP where BGA are involved?
Electronics Forum | Thu Jul 17 20:20:21 EDT 2014 | mac5
Hi June, The biggest issue with an OSP finish is as soon as the PCB sees a heat cycle (reflow or wave) the finish will begin to degrade. If you have a single sided SMT assembly with THT components installed downstream it works pretty good. But a dou
Electronics Forum | Tue Mar 24 09:50:45 EST 1998 | Justin Medernach
| Do I need to specify any type of special | finishing to my PCB manufacturer when having | boards fabbed that contain BGA footprints ??? | Thanks, | Stuart No special finish is required. I have assembled boards with BGA population that had HASL,
Electronics Forum | Wed Jul 08 02:50:30 EDT 2020 | rsatmech
Hi DucHoang, Thanks for the response. I will share the images. We are using OSP boards and issue is not at particular BGA. Can you suggest me any methods to identify the pad contamination.
Electronics Forum | Wed Sep 21 16:25:43 EDT 2005 | GS
IPC-7525 tells you how to make stencil apertures for BGA IPC-7095 tells you how much should be the paste volume in order to get a reliable BGA solder joint. How are your PCB finisced? (HASL, ENIG, OSP, etc?) In case of not HASL, it could be necessa
Electronics Forum | Tue Sep 11 22:52:18 EDT 2007 | davef
Here are some options for removing OSP coatings from pads of the BGA substrates. * Leave the substrates in storage for 13-14 months. Shelf life of OSP coating is ~12 months, depending on the product. * Wash the substrates in your aqueous washer. Ea
Electronics Forum | Wed Jun 24 16:23:29 EDT 1998 | Justin Medernach
| Has anyone had experience with placing BGA on gold plated boards. I thought I read a while ago there was a problem with embrittlment causing cracked joints. If anyone has experience with this your feedback would be great. | Mike Mike, Your concer
Electronics Forum | Tue Aug 15 16:57:54 EDT 2000 | Doug Philbrick
In many threads here I have read and talked about Electroless Gold problems and have experienced my own problems with it. Love to hear what others are doing as a replacement. Is it Electroless tin, is it osp or is HASL good enough for .031 pitch BGA
