Electronics Forum | Thu Apr 29 10:11:41 EDT 1999 | Cunli
| Can anyone in this world produce such small PCB/PWB trace widths? Lots of theory so far, but have not found anyone yet who can do it in practice. | Dan, I have seen boards with 3 mil pitch (that is 1.5 mil trace and 1.5 mil spacing) in quantity
Electronics Forum | Tue Apr 17 17:30:09 EDT 2007 | jaimebc
Our experience with leaded paste and SAC305, for 0402's, has been positive with the following stencil designs: 1.- 5 mil thickness. 2.- Home plate design. Hope it helps.
Electronics Forum | Tue Feb 21 21:17:41 EST 2006 | Cal Kolokoy
M, The paste height is what you establish it as. You're probably using a laser measurement system, and these depend on where your reference datum is. Some will measure from a silkscreen, a trace, or solder mask. These add height, not to mention H
Electronics Forum | Sat Jan 30 21:55:52 EST 1999 | Kallol Chakraborty
Does anyone have any reliability data /concern on pressfit rework/repair - is there any qualified /characterized equipment /tools present in the industry? What kind of effect does it have on barrel plating quality (1.5mil avg.) after 1 time rework or
Electronics Forum | Wed Dec 08 19:16:20 EST 2010 | jgalarza
Can anyone tell me if there is a formula for finding the after reflow height of solder with no part attached? I have to print some pads that do not have any parts but there can not be more than 1.5mil of solder on the pad after reflow. I am going to
Electronics Forum | Wed Jul 13 19:47:06 EDT 2005 | Darby
This works for me with ENIG finish and a SAC305 NC paste Reduce all pads by -2mil on all sides ie 0.050" x 0.050" becomes 0.046" x 0.046" EXCEPT Anything smaller than 30mil; -1.5mil Anything smaller than 20mil; -1mil Anything smaller than 15mil;
Electronics Forum | Tue Feb 21 20:22:46 EST 2006 | mnguyen
Hi, I am having problem looking through IPC and finding according to ISO spec what should the paste height requirement vs stencil. EXAMPLE: The stencil is 5mils thick and according to the specs we have on paste height measurement the max height to be
Electronics Forum | Fri Jul 07 12:44:49 EDT 2017 | tsauve
The problem is registration between the stencil & the smallest pads on the 5 substrates. Using SPI s/w I can overlay the paste layer over the PCB image to determine stretch/shrink. Our worst case was shrinkage of 10.2mil on a 5-up 300mm panel - small
Electronics Forum | Thu Sep 17 15:21:50 EDT 2020 | lpbro
For height, I start +-2mil usually. For 3mil stencils, my lower limit starts at 1.5mil, upper is 5. If the area is chem ethed, I normally add .5 to the stencil height. My default volume is 60 - 160%. Then print specs are adjusted till I see fit, then
Electronics Forum | Tue Feb 02 10:12:50 EST 1999 | Justin Medernach
| Does anyone have any reliability data /concern on pressfit rework/repair - is there any qualified /characterized equipment /tools present in the industry? | What kind of effect does it have on barrel plating quality (1.5mil avg.) after 1 time rewor
