Electronics Forum | Sun Mar 08 06:07:18 EST 1998 | Rob F
I am looking for information on the electrical performance affects of voltage gradients in PCBs, and links or information on trends in Surface Mount Technology.
Electronics Forum | Wed Jan 15 11:53:40 EST 2020 | avillaro2020
As far as the large thermal gradient I have on my thick and thermal heavy board, I've done quite a bit to minimize the gradient but not successful. it's like one pad is connected to a signal while the other pad is connected to ground, you can't bring
Electronics Forum | Tue Aug 22 16:13:08 EDT 2000 | Dr. Ning-Cheng Lee
FR-4 will be OK for small products such as cellular phones. Here the temperature gradient across the board may be 3-4C only, and the board temperature can be well controlled. At temperature above around 245C, the discoloration and delamination may be
Electronics Forum | Mon Aug 12 15:56:13 EDT 2013 | pjchonis
Vapor phase soldering systems by Asscon are characterized by special designed heating modules. The thermal mass of the heating modules is designed so that a completely delay-less and direct regulation of the heat/flow/energy transfer to the soldering
Electronics Forum | Wed May 19 16:35:18 EDT 2010 | stepheniii
How thick is the stencil? Also what type of paste? We have a nice little microscope that has gradients on the lens so we can measure whether an aperture is 8 thou or not. Almost always it is but then we buy from a couple of good stencil suppliers.
Electronics Forum | Thu Aug 24 09:41:46 EDT 2000 | Dr. Ning-Cheng Lee
The optimal profile to choose is determined by the following factors, (1) thermal mass and distribution across the board, (2) reflow temperature range needed for a particular alloy, (3) the nature of flux. When the thermal mass is small, such as cell
Electronics Forum | Thu Nov 01 13:08:38 EDT 2007 | samir
AJ - Why so stringent on your 2�C Delta T? You say your peaks are within 2�C - 3�C of each other within the device. Reason I'm asking. With a 5-zone oven, it is very difficult to achieve that. With more zones, you can put a little "knee" or soak
Electronics Forum | Mon Jul 08 13:19:06 EDT 2013 | williamaxler
There are a lot of things that you need to look at to figure this out. What type of flux are you using? Is this leaded or lead free? Do you have the gradient of the nozzle setup properly? Are these locations tied to plains? With that being said
Electronics Forum | Fri Jun 06 06:11:18 EDT 2014 | paulg
I have a large monoblock ceramic filter on a PTFE based pcb material. The filter has a metal casing soldered onto the ceramic filter. I am concerned that if the heating rate is to rapid, then thermal shock / differential expansion could cause the fil
Electronics Forum | Tue Jul 02 12:10:06 EDT 2002 | fmonette
Dason, Just a word of caution about your experiment. Evaluating moisture content by weight gain is a very simplistic model, based on the assumption that the moisture content is uniform across the package. In fact, recent technical papers have cl
