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Imm Silver tarnish?

Electronics Forum | Sat Aug 30 11:42:49 EDT 2008 | davef

Some immersion silver [IAg] products can go brown with aging. On a newly plated board, we expect you to see Ag, C, & O. The amount will vary according to supplier and thickness. Questions are: * How uniform is the brown coloration of the IAg on the

ENiG or IAg? Which is better?

Electronics Forum | Fri Mar 14 15:14:31 EDT 2008 | samir

Dean, thanks for schooling me on this. I talked to an industry collegue whom I met at APEX, and it was he who had told me of the IAg "rework issue." Basically, he told me that they had field failures on QFPs that were a direct result of trying to "

PCB immersion silver discolouration

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

ENiG or IAg? Which is better?

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

ENIG

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

RoHS Issues

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.

ENiG or IAg? Which is better?

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.

ENiG or IAg? Which is better?

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?