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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

Post Reflow changes To Silver Immersion Copper Traces On PWB

Electronics Forum | Sun Feb 17 17:55:21 EST 2019 | davef

Each time that you cook imm surfaces, you give-up coating thickness. Spec IAg can take maybe 4 thermal cycles ... [that's what I remember but those could be PbSn, not SAC cycles]. Anyhow, the more that you decrease coating thickness, the more that Cu

Post Reflow changes To Silver Immersion Copper Traces On PWB

Electronics Forum | Mon Feb 18 09:25:20 EST 2019 | davef

It doesn't matter if the traces have solder or not. We're talking thermal cycles. RE IAg thickness: I believe the IAg is a self limiting process, similar to IAu. Your fab may be able to help a little, but I don't expect a substantial change. And if

reflow profile

Electronics Forum | Tue Feb 19 10:50:13 EST 2019 | rgduval

Call Heller directly, and give them the oven, and relative thermal density of the board, as well as the solder paste that you're using. They'll be able to give you a baseline profile to start from (both RTS and RSS). Otherwise, use a thermocouple p

reflow profile

Electronics Forum | Tue Feb 19 12:28:26 EST 2019 | slthomas

Presumably you're talking about lead free, but you don't say. Heller can probably provide you with a starting point, as rob has already pointed out, but you do need to develop the capability to perform profiling yourself. That oven should have ECD

reflow profile

Electronics Forum | Wed Feb 20 11:40:31 EST 2019 | bmalhi

Heller Oven comes with a profile pre-loaded so you can start there. RTS = Ramp to Spike. Basically a straight line from preheat to spike. Also known as “Tent” profile RSS = Ramp Soak Spike. This one creates a flat line around 150-180 degrees on th

Board Explorer Old software

Electronics Forum | Wed Feb 20 01:17:48 EST 2019 | jbuivydas

Hello, Here is the situation: A colleague is working as a production process supervision technician in the factory. He uses program called " Board explorer " and after changing the computer to a new one the license he had no longer works. A temporar

Universal Instruments Genesis Servo Amp

Electronics Forum | Thu Feb 21 05:34:21 EST 2019 | reckless

I have 2 older genesis machines currently down due to VRM Servo issues. I'm debating whether its better to stock up on some spares as I'm finding spares cheap currently. How often do they go out and how long should they last? Any other parts that

Merging BoM and XY Data

Electronics Forum | Fri Feb 22 13:55:27 EST 2019 | bruce_mackean

Is there a need for a simple application to merge a bill of material with the xy placement data into a single (or top/bottom) files for machine programming? ie. add a part number column to the xy data, including "N/A" for parts not found in the BoM?

Merging BoM and XY Data

Electronics Forum | Sun Feb 24 09:13:38 EST 2019 | spoiltforchoice

Look on this forum for a link to SMTMaestro which does just that. Fab3000 is almost there with its BOM tools and has a bunch of handy features, its just that they have not considered this use case instead focusing on recreating the centroid from gerb


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