Electronics Forum | Mon Dec 17 11:55:08 EST 2007 | chef
I recently had the same problems, solder bridges on every thing I made, different customers boards, etc. I wave with no-clean flux. As I sorted out problems (pin holes, blow holes, splatter, etc.) I found a lot of variable factors. I changed flux,
Electronics Forum | Thu Apr 05 08:44:45 EDT 2007 | ck_the_flip
"Guest" is right, actually. CSP's are essentially BGA's, but typically the pitch and ball diameters are much smaller and in some cases, the pads of the CSP's can not be screen printed. If that's the case, you'd have to have flux-dip capabilities on
Electronics Forum | Thu Jul 06 03:03:56 EDT 2006 | ronalds
Thank you all for your input. The MF300S Multicore flux is rated for lead free. There is not much dross or contamination. We are using nitrogen. I've tested the boards with the curing test of IPC-TM-650. I think you're all right about the preheat.
Electronics Forum | Wed Apr 04 18:27:53 EDT 2007 | Guest
Most CSPs are BGAs. Some are sent without bumps or balls. Thjos eneed to be bumped prior to processing for best results
Electronics Forum | Fri Apr 06 01:10:16 EDT 2007 | Haris
My SMT line does not has these facilities so would you please tell me regarding the UNDERFILL AND FLUX-DIP process and how they can be done? Thanks.
Electronics Forum | Fri Apr 06 09:45:08 EDT 2007 | pjc
CSP= Chip Scale Package, meaning small. A MicoBGA is a CSP, while a regular BGA is not a CSP. CSPs require fewer steps to fabricate than standard BGAs. A commonly quoted definition of a CSP is a package where the body size is
Electronics Forum | Mon Dec 17 19:01:45 EST 2007 | bbarton
As someone with a LOT of experience with the "low cost" alternative alloys, primarily SACX, I have one simple question....Are these shorts a new phenomena? WAS your process in control, and all of a sudden it's not? If the answer is YES, take a look a
Electronics Forum | Wed Dec 05 10:58:59 EST 2007 | shrek
Mr. Long, me lad, I don't follow. You say stuff about RoHS and all the banned materials covered by RoHS, but what is your theory on how banned substances can get on a RoHS board if you are running both Pb and Pb-free on the same oven?
Electronics Forum | Thu May 06 10:52:08 EDT 2004 | John S
Many component manufacturers are moving to Pb free terminations. I've been doing a literature study of Pb free processing and have found several articles that indicate Pb-free paste with Sn/Pb terminations leads to early fatigue failures. Does anyo
Electronics Forum | Sat Nov 05 07:33:14 EST 2005 | milroyperera
Hi, I see that the wave angle of the wave solder machine takes a major part on soldering SMDs if they are assemlbed with glue. To avoid the shadowing effect and bridging what would be the best angel of the wave for Sn/Pb & Pb-free soldering processs
