Electronics Forum: gas and tube (Page 1 of 6)

Nitrogen gas and Tombstone defect

Electronics Forum | Mon Nov 21 10:12:11 EST 2011 | callckq

All, I try to find explanation(Article)on how Nitrogen gas can make tombstone defect even worst. However, I can't find one in the net. Anyone that has this information or article, appreciate if you can share with me...Thanks in advance.

Nitrogen gas and Tombstone defect

Electronics Forum | Mon Nov 21 16:34:03 EST 2011 | davef

Google: nitrogen reflow tombstone https://www.google.com/search?q=nitrogen+reflow+tombstone&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Nitrogen gas and Tombstone defect

Electronics Forum | Thu Nov 24 07:41:33 EST 2011 | davef

Here's a paper from the SMTnet Newsletter http://www.smtnet.com/library/files/upload/dispelling_10_myths_about_nitrogen_reflow__andy_mackie.pdf

Nitrogen gas and Tombstone defect

Electronics Forum | Tue Nov 29 14:57:45 EST 2011 | jlawson

Sorry on N2 and tombstone, many other aspects cause tombstones and n2 in itself does not cause tombstones. It can help make other bad variables tip over edge to cause tombstones more than with no N2. Get these right then N2 is not issue.

Nitrogen gas and Tombstone defect

Electronics Forum | Tue Nov 29 14:55:17 EST 2011 | jlawson

N2 is a reflow process widener so to speak, for leaded reflow less of a impact, for LF more impact, and if using finer LF solder pastes T4,T5 and smaller paste deposits generally, it helps widen window for flux in paste in oxide protection during soa

Nitrogen gas and Tombstone defect

Electronics Forum | Mon Nov 21 10:51:12 EST 2011 | scottp

I've never seen a good article with a definitive explanation - just speculation that the increased wetting forces due to nitrogen result in increased tombstones. My own experience is that nitrogen is a very minor contributor to tombstones and can pr

Re: Desoldering of TSOP and TSOJ

Electronics Forum | Sun Jan 10 08:44:32 EST 1999 | Dave F

| | | HI! I am a package engineer in Korea. I have some reasons | | | to desolder excessive solder at the lead of TSOP and TSOJ | | | after removing them from the board. The way with solder wick is too time-consuming and depends on the operator. |


Electronics Forum | Wed Jan 15 07:25:37 EST 2003 | Jean-Philippe

LPMTF means Low Profile Multi-Tube Feeder and EMTF means Extended Multi-Tube Feeder. The difference is that the EMTF is bigger and it supports a wider range of tube.

PDBE and PBB replacements???

Electronics Forum | Mon Mar 21 09:33:25 EST 2005 | davef

RoHS Substance||RoHS MCV Limits||Typical Testing Approaches Lead||1000 ppm* ||Wet chemical digestion followed by ICP (Inductively coupled plasma) or AAS (atomic absorption) spectroscopy ||||XRF (X-ray fluorescence) spectroscopy Cadmium||100 ppm ||Wet

tape and reel machine

Electronics Forum | Wed Oct 10 13:35:00 EDT 2001 | stepheno

I used to work with Chris. (neither of us are there anymore). What is he talking about is putting components into "pockets". The parts would come in, in sticks (tubes) but we wanted them in reels. At first we sent them out to be reeled, but that w

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