Electronics Forum | Mon Sep 22 15:32:20 EDT 2008 | davef
We see this fairly often. It doesn't affect solderability. Our analysis makes us think this coloration is copper. The reason copper appears on the surface may be that heat cycles increase the thinness and porosity of the immersion silver [IAg] coatin
Electronics Forum | Sat Mar 15 09:30:29 EDT 2008 | davef
Unlike other solderability protection, immersion coatings [eg, ImAg, ImSn, OSP, etc] can be reworked by the board fabricator prior to assembly operations. Reasons for selecting immersion are: * Until a supplier can demonstrate that they can turn bla
Electronics Forum | Thu Jan 22 20:14:44 EST 2009 | herman
If you wish to specify ENIG, your best method of doing it is to simply invoke IPC-4552 (or IPC-4553 for immersion silver) on the fabrication drawing. These IPC standards define ENIG and IAg, and I believe they specify 150-180 uinches of nickel covere
Electronics Forum | Wed Apr 18 14:45:23 EDT 2007 | Brett
Check with your PCB supplier who the manufacturer of your I-Ag is. This makes a world of difference with regards to solderability.
Electronics Forum | Thu Mar 06 12:10:38 EST 2008 | samir
Thanks, I stand corrected on the tarnish definition. Thanks for the input too. That's exactly what I wanted.
Electronics Forum | Thu Mar 06 13:12:55 EST 2008 | shrek
KRIKIES Chunks me-lady. Yellow toe-nails with tree rosin will definitely sodder that there immersion silver. Sounds like i have met me match. Who is this fella with the toe-nails?
Electronics Forum | Thu Mar 06 14:06:50 EST 2008 | realchunks
Some guy who things he's cool cause he drives a Vette whilst his collar is up.
Electronics Forum | Thu Mar 06 15:05:58 EST 2008 | wavemasterlarry
LISTEN forget about all this stuff with corviettes and jeeps. ive driven a Gremlin since '77.
Electronics Forum | Thu Mar 06 15:31:47 EST 2008 | hussman
Sounds like bad mechanical skillz. Thank gawd you don't own a 2002 Ford Explorer!
Electronics Forum | Thu Mar 06 15:33:42 EST 2008 | realchunks
I hear that. A 2002? You poor b-stard! That's like having cold solder joints! (Gotta keep it related)