Electronics Forum | Mon Oct 08 23:17:48 EDT 2001 | Brad Arnold
We are trying to produce a PC Card bus assembly with a 672 pin BGA on one side. These pcb's are .015 thick. I believe the ball pitch is .5mm. The pcb's are plated with white tin. The pcb's are in a 1 X 3 array. We had 2 plates with appropriate cutout
Electronics Forum | Wed Jul 31 17:25:39 EDT 2002 | sueph
Dave, thanks for the reply. These boards have metal plating covering 99 percent of both primary and secondary surfaces. The only places without the metal plating are the extreme outer edges and about an 1/8 inch surrounding the plated holes. We do
Electronics Forum | Fri Nov 22 17:55:39 EST 2002 | robertorre
Your problem may be related to different aspects. 1. Oxidation on landing pads. 2. Either high(To long over liquidous temp) or low temp. 3. Bad solder (not enough vehicles) Run this test: Set a hot plate to 220 degrees C. Make sure you have proper ve
Electronics Forum | Wed Nov 20 18:41:57 EST 2002 | slthomas
Here's part of what I could read: "We evaluated the influence of Lift-off (Fillet-lifting) and the influence of thermal fatigue, in this case on combination between various terminal platings of electronic components and Pb-free solder, Sn-37Pb solde
Electronics Forum | Thu Apr 17 17:38:57 EDT 2003 | Takfire
Dave, I am not exactly sure what is driving them to believe that this is a capacitor issue. It is unfortunate, that this belief has slowed their activity in further understanding their manufacturing process. The caps are BME (Base Metal Electrode
Electronics Forum | Fri Jul 04 12:32:33 EDT 2003 | sam
I need some advice about a problem that happened in a SMT LED: The failure symphoms of this SMT LEDs is that the LED body itself seemed to be functional, but when soldering on the products, it showed good wetting and soldering, LEDs are bright and l
Electronics Forum | Thu Nov 13 12:24:03 EST 2003 | babe
Hello folks, I have a customer who has what appears to be very oxidized leads on a component. Their component mnf. has no new product to offer and they have 20K of these they have to solder to get product out the door. They are using a no-clean chemi
Electronics Forum | Fri Dec 12 11:52:59 EST 2003 | Marc Simmel
I have encountered problems with a 90/10 tin-lead plated SMT component wicking all the solder paste off the pads on the substrate. Worst, the defect occurs randomly - adjacent leads may have 'good' joints, though heel fillets are poor. The solder pa
Electronics Forum | Mon Apr 12 22:22:01 EDT 2004 | davef
Large voids are common in via in pad [seach the fine SMTnet Archives for earlier laments], especially in blind via. Observations on your via out gassing theory: * If the copper plating on your via is GT 1 thou, there will be no outgassing from the
Electronics Forum | Wed Apr 28 12:33:05 EDT 2004 | Dave G
Rob, Don't know if you bought an "H" tower with your UP or not. You did you can have a dedicated support plate made from Aluminum that has pockets machined out to match components on the bottom of the board. (Most of the workholder guys can set you
