Electronics Forum | Sat Aug 23 08:43:32 EDT 2008 | davef
Ugh, there are more reasons that immersion silver [IAg] to go yellowish than pigs at the county fair. That aside, sulphur is one of the reasons, as you say. The sulphur can be from a variety of sources, such as: * Pollution in the air * Ill advised p
Electronics Forum | Tue Dec 13 15:18:32 EST 2011 | ck_the_flip
DaveF, That's correct. This assembly is plain old tin-lead, but our buyer purchases the bare PCB with lead-free HASL plating. My main concern was the regular tin-lead not coalescing with the PCB plating and having a weak intermetallic. I'm not fr
Electronics Forum | Fri Apr 05 13:53:56 EDT 2013 | microaide
0.700. What is special about 0.700? My part is an SOLIC14, which has a length of 0.350. So 0.700 is exactly twice the length of the part. Is there a problem feeding a part from a vibratory feeder if the escapement length is more that twice the lengt
Electronics Forum | Wed Jul 06 15:33:36 EDT 2016 | davef
Please explain how you would go about grounding a circuit board EOS/ESD Association Frequently Asked ESD Questions 16-Threshold Volume 26, No. 1 January/February 2010 Q. I have a customer that wants us to measure our compressed air for static. Ho
Electronics Forum | Thu Apr 20 14:59:11 EDT 2017 | davef
It's difficult to tell anything from your picture. But playing the odds, I'd say it's not "gold corrosion." It is very difficult to corrode gold. Gold is a NOBLE metal. From Wikipedia, the free encyclopedia In chemistry, the noble metals are metals
Electronics Forum | Mon Nov 27 22:01:25 EST 2017 | bibi11952
Hello SMTNet, We had received boards from our CM, some came with a Tin plated finish on the SMT hermaphroditic edge connector, while others came with Gold plated on the same connector. Tyco supplies both version and they apparently mixed up parts.
Electronics Forum | Mon Jan 10 03:45:23 EST 2022 | proy
YES there is an IPC target/acceptable spec In general terms the barrel thickness in the hole should be 1 mil (thou). IPC has an allowable limit lower around .75 with some other factors. I have been checking barrel plating on all incoming boards since
Electronics Forum | Thu Nov 10 20:39:44 EST 2022 | SMTA-64386598
The solderability shelf life of ENIG is related almost entirely to diffusion of O2 through the gold plating. When O2 diffuses through the gold, the underlying nickel is oxidized rendering it unsolderable (with ENIG - you solder to Ni, the gold dissol
Electronics Forum | Sat Nov 14 08:05:54 EST 1998 | Earl Moon
| | | | I believe that gold fingers on my circuit boards are being | | | | contaminated and need to clean them with some chemical | | | | solution. Any recommendations. | | | | | | | Chuck: What is the type and source of your contamination? Dave
Electronics Forum | Fri Oct 30 01:07:34 EST 1998 | Earl Moon
| I am a recently graduated Process Engineer. I am working for a company developing and manufacturing printed circuit boards. I am looking for a web link, magazine article, book, etc which describes the processes which happen at a board house. More s
