Electronics Forum | Thu Jun 16 08:31:15 EDT 2005 | jh0n!
The most part I have the most difficulty with is a 16mil QFN. We found that reducing stencil thickness to 4mil, and reducing aperatures for the IC by 20%, and setting local fiducials to the IC helped immensely. We used to get 75% or more bridged ou
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
Electronics Forum | Thu Sep 07 08:44:17 EDT 2006 | vicknesh28
Did check the coplanarity of the failed lead and found it to be as good as the wetting leads.
Electronics Forum | Mon Sep 25 17:06:36 EDT 2000 | JAX
LarryK, You might want to talk with: Fancort Industries, Booth #2630 31 Fairfield Place West Caldwell, NJ 07006 973-575-0610 www.fancort.com MLCS-1 Manual Lead Conditioning System. It is a bench top, hand operated machine to correct deformed lea
Electronics Forum | Mon Oct 02 16:31:17 EDT 2000 | Larry
I have seen people take old stencils and cut out land patterns, place the component over the land pattern and use a orange stick to move the leads back into place.
Electronics Forum | Thu Sep 07 07:41:06 EDT 2006 | Bubba
Check for coplaner leads if this just exists at reflow process, i.e. look at part before oven, turn on 3D at placement machine. If you see after wave solder, the wave could cause coplanarity issues on top as well if you are going slow enough to refl
Electronics Forum | Tue Sep 26 09:27:10 EDT 2000 | Chris May
LarryK, It all depends upon your volume / problem. As Jax says, if this is a repeating problemo, get QA & Purchasing involved. Is it your stores ? Do they receive 100 off and "decant" 20 into a tube (manual handling error, training etc;). From your
Electronics Forum | Mon Sep 08 20:55:04 EDT 2008 | davef
Of the six pads in the picture, which are the two that are unacceptable?
Electronics Forum | Tue Sep 09 07:42:25 EDT 2008 | wavemasterlarry
God..... give it a rest.
Electronics Forum | Wed Sep 10 16:12:57 EDT 2008 | vladig
And doing analysis you are NOT changing things. Vlad
