Electronics Forum | Sat Sep 12 10:47:00 EDT 1998 | Jon Medernach
I am aware that the Intel processor is available in a 0.012" leadframe, as a TAB product ( which can be excised and placed with may P&P machines but I do not know of any 0.008" leadframes, Bumped Die are at these pitches and frankly I would bet dime
Electronics Forum | Tue Dec 03 18:51:57 EST 2019 | kylehunter
Hi all, We are having a confusing defect with one of our client's boards. It is a large board, 30" x 12". The client supplies the LEDs, they are cheap overseas diodes, and it is not uncommon to have reels with the packaging torn. We have w
Electronics Forum | Wed Dec 04 07:35:08 EST 2019 | proceng1
We also have a few customers that seem to buy the cheapest LEDs available and provide them for the build. We've had complete reels that had obviously been exposed and oxidized. You can try a solder with a more aggressive flux. How long is your pro
Electronics Forum | Fri May 30 18:57:44 EDT 2003 | russ
We place a large amount of .4mm (what is that in microns?)QFPs every day. I would much prefer a BGA package. Reasons are 1. Pitch is greater which provides a larger process window 2. Alignment is easier because you don't need vision for BGA if you
Electronics Forum | Fri May 28 07:37:52 EDT 1999 | Steve Cheung
Yes l know this problem keeps cropping up on the forum but l've missed some of the follow-ups. Our problem is that the lifting only occurs on 3% of production so actually detecting an improvement is difficult. We're actually having to inspect 144 p
Electronics Forum | Thu Jul 15 18:07:04 EDT 2004 | dwanzek
This has been a tough one to date. Any ideas will help. Problem definition � random QFP144 part not soldering all leads. Percentage fallout is about 1-5% of boards. Usually leads, one or more, on trailing side to the direction of travel does not wet
Electronics Forum | Thu Aug 12 22:38:44 EDT 1999 | Dave F
| Hello | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | 100 durometer blade. Getting "tails" on deposi
Electronics Forum | Fri Aug 13 13:47:52 EDT 1999 | Brian Wycoff
| | | | | Hello | | | | | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | | | 100 durometer
Electronics Forum | Fri Aug 13 13:50:53 EDT 1999 | Brian Wycoff
| | | | | | Hello | | | | | | | | | | | | Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening | | | | | | 100 du
Electronics Forum | Sun May 30 08:50:42 EDT 1999 | Dave F
| Yes l know this problem keeps cropping up on the forum but l've missed some of the follow-ups. | | Our problem is that the lifting only occurs on 3% of production so actually detecting an improvement is difficult. We're actually having to inspect
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