Electronics Forum | Thu Jan 21 19:28:44 EST 1999 | Michael Allen
Can anyone confirm that both Metal QFPs and Ceramic QFPs are NOT moisture-sensitve? I'm pretty sure this is true, but I want a sanity check. Thanks.
Electronics Forum | Fri Jan 22 08:32:53 EST 1999 | Dave F
| Can anyone confirm that both Metal QFPs and Ceramic QFPs are NOT moisture-sensitve? I'm pretty sure this is true, but I want a sanity check. Thanks. | Mike: You're correct. Dave F
Electronics Forum | Fri Mar 23 18:55:30 EST 2001 | davef
Consider posting actual measurements of your pads, component leads, and apertures.
Electronics Forum | Wed Mar 10 08:20:00 EST 2010 | aajmera
I am sorry, they are fine-pitch QFPs (20 mils)
Electronics Forum | Thu Mar 22 08:07:41 EST 2001 | CAL
Selective Laser Soldering? Beamworks and Speedline Electrovert Both demo'd units at APEX. I am partial to the Beamwork machine cause it was able to do BGAs. Are the QFPs acceptable? You mention cleaning the pads, Stencil aperture enlargement could t
Electronics Forum | Wed Mar 21 20:40:28 EST 2001 | dblsixes
We are building a monster ... Dimensions are 10" x 7" ... 12 layers ... A Logic Assembly with a Power Supply all rolled into one ... The Power Supply is in one section of the board, the logic in the other section ... The Power Supply obviously has a
Electronics Forum | Thu Jul 20 10:03:30 EDT 2000 | Bob Willis
All the points raised so far are correct. Only use QFPs if rearly pushed as the yield on your process will suffer. I have wave soldered parts down to 0.020" in nitrogen with OK results but the pads and drainage pads need to be worked on. Another r
Electronics Forum | Sat Jun 22 21:06:27 EDT 2002 | jersbo
I agree with PJC.. The mention of 2 QFPs to wave = more than likely rework to remove bridges and a potential to scrap the board, 25mil isnt as bad as 20 or less.. but the potential is still very real.$$$$$$ reflow/reflow is my 2 cents with the possib
Electronics Forum | Wed Jun 02 18:28:17 EDT 2004 | russ
I would look at the Samsung CP40 or 45. They have the placement rates you want even a little better on the 40. the 45 will double that easily. They handle all types of parts down to 0201 components. Depending on the camera you select (25mm) you ca
Electronics Forum | Mon Sep 25 16:14:16 EDT 2000 | LarryK
What do you all do to fix coplanarity on fine pitch QFPs? I know that the best thing would be to send them back to the vender, but what about the when you gotta use them? Straightening by hand seems to be so time comsuming. Any better ways? Larry
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