Electronics Forum | Sat Jul 26 11:17:31 EDT 2008 | manishc
i am facing problem of pcb track lifing at B.G.A. after reflow.we r using lead free paste and fr-4 grade pcb with peak temp.about 270 deg.
Electronics Forum | Mon Jul 28 05:48:17 EDT 2008 | mattkehoe
What could be the main reasons for De-wetting in > reflow process. Can anybody answer Normally it is a contaminated surface finish.
Electronics Forum | Fri Aug 01 00:22:46 EDT 2008 | fowlerchang
Pattern design, paste volume,printing misalignment, place misalignment,reflow process include N2 usage. All the factor above can make tombstome happen. And the most important factor is placement misalignment except design issue. But pls check the sol
Electronics Forum | Fri Aug 01 08:10:29 EDT 2008 | scotceltic
Has anyone come across a standard or study (JEDEC, IPC) where it has the recommended shelf life outside of a dry box for immersion silver coated PCB's to prevent oxidation from affecting the soldering process (Both reflow and Wave). I know it will
Electronics Forum | Mon Aug 04 10:19:04 EDT 2008 | realchunks
One oven can run both, but your profiles may vary. You will not contaminate your lead-free by running it behind the leaded stuff. Even if you spell "native" as "native".
Electronics Forum | Wed Aug 06 05:53:33 EDT 2008 | crashoveride
hehehe... nice try.... ok, for the benefit of all, its a. l. t. e. r. n. a. t. i. v. e. We're just wondering why this "word" simply do not appear as it is supposed to be.
Electronics Forum | Wed Aug 06 09:34:25 EDT 2008 | grics
ive does not appear correctly either. It should be s.e.l.e.c.t.i.v.e.
Electronics Forum | Fri Aug 01 15:45:11 EDT 2008 | jdengler
We use a Brady label PTL-13-457 out of a TLSPClink printer on a 63/37 PCB. This label is supposed to go to Pb free temp but we have not actually tested it yet. - Jerry
Electronics Forum | Sun Aug 03 08:39:10 EDT 2008 | davef
Here is an interesting article on using labels in electronic manufacture http://www.barcode-labels.com/articleelec.htm We have no relationship, nor receive benefit from the company referenced above.
Electronics Forum | Thu Aug 07 22:02:07 EDT 2008 | davef
We agree with Doug. These parts appear to have poor solderability. It looks like during reflow the parts are sitting on top of the molten solder and the fans are blowing them off the pad.
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