Electronics Forum: sac305 dull (Page 1 of 1)

Post Reflow changes To Silver Immersion Copper Traces On PWB

Electronics Forum | Sat Feb 16 07:21:17 EST 2019 | SMTA-Joe

I am experiencing a "tarnishing" issue on PWB traces that may be causing problems with component reflow. The PWB traces are made to the following spec: SOLDER MASK OVER BARE COPPPER WITH SILVER IMMERSION PLATING PER IPC4553, PLATING TO BE 8-12 MIC

Low Flux Residue Solder Paste

Electronics Forum | Tue Jun 20 09:28:30 EDT 2006 | cuculi54986@yahoo.com

We evaluated four SAC305 pastes. Of the four, we found Alpha OM-338 to appear to have the least flux residue. We also found it to be the most dull, least shiny, most non-SnPb looking of the four.

Lead free Solder Paste troubles !!!!

Electronics Forum | Thu Sep 23 11:56:30 EDT 2004 | rkevin

We are printing on an assembly using SAC305 Alloy Sn96.5 Ag 3 Cu .5 with a no clean flux and getting virtually NO spread with either a ramp to spike or straight ramp profile. We are printing to standard FR4 board with immersion Ag finish. I am trying

SAC305 preforms not wetting to ENIG pad in fluxless process

Electronics Forum | Wed Apr 14 19:47:13 EDT 2021 | solderingpro

Sounds like you may have already found the issue: inconsistency from your supplier. Seeing as Gold really doesnt oxidize and you're using an inert environment (N2 I suspect), I would turn my attention to the supplier. You said yourself, the "Shine

Lead free profile

Electronics Forum | Thu Jan 20 17:14:39 EST 2005 | jbrower

Today, I have just finished evaluating Kester's EM907 (SAC305)lead free solder paste and found that for our applications it performs as expected. End result that I am encouraged with the results that we got. The equipment that I used: An SMT2020 to


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