Electronics Forum | Wed Aug 23 08:55:39 EDT 2000 | Dave F
Dr. Lee: Taking a tangent on your response ... When talking about alternate solders. Bismuth forms an alloy with lead with a melting point of 93�C. Are there special conditions that cause this alloy to form? Or does the alloy form commonly when
Electronics Forum | Wed Aug 23 17:15:25 EDT 2000 | Dr. Ning-Cheng Lee
The ternary SnPbBi phase does form commonly when Pb and Bi are combined. No special condition required. Presence of this phase jeopardizes the reliability for applications involving temperature near 96C. Using low temperature solders means a lower s
Electronics Forum | Tue Feb 07 11:40:55 EST 2023 | tommy_magyar
To me it looks like grounding.
Electronics Forum | Wed Feb 08 17:37:06 EST 2023 | compit
5 to 5 :) 7 is ground in DB-25 version
Electronics Forum | Mon Jan 26 21:10:36 EST 2004 | Vinny
I have done acurate profiling which meets the solder paste specifications. The point I am trying to highlight here is also due to the ground plane side being much larger causing the tombstone defect. I have even tried doing a linear profile, it hel
Electronics Forum | Tue Feb 10 15:13:06 EST 2004 | patthemack
Hey Vinny, Sorry I haven't looked at this for a while. 3 things to try: Tombstoning- The ground plane side is larger because the solder mask allows for a little slop at the board shop (clearance around a pad of a few mils). Since there is not a defi
Electronics Forum | Fri Apr 16 11:35:17 EDT 1999 | Cunli Jia @ SMTnet
Dear Brian, You made two points we want to address. The first is that you are concerned about the amount of information we ask in the registration and how it is going to be used. This is a legitimate concern that we need to address, and have tried
Electronics Forum | Fri Jun 16 11:28:53 EDT 2000 | Boca
Solder 'follows' heat. 1. Preheating is a great idea, use a baking oven to get the whole assembly up to temperature, use the preheaters in your wave solder machine (without wave) to preheat the assemblies ... 2. Or use the biggest soldering iron
Electronics Forum | Wed Apr 23 09:38:05 EDT 2014 | rgduval
Get in touch with your paste manufacturer. They should have a data base of different oven types/zones, and can give you "baseline" settings for a medium thermal density board that has been proven to work well with their paste. After that, it sounds
Electronics Forum | Mon Jul 08 05:10:56 EDT 2002 | bayanbaru
We are assigned to set-up an ESD control at a new site. There are a few proposals in mind, they are 1) conductive flooring with heel strap or shoe 2) wrist strap with continuos monitoring 3)the normal wrist strap with the common grounding point. Woul
