Electronics Forum | Thu Dec 26 12:51:32 EST 2019 | emeto
Very broad topic. Designers own design. Manufacturing engineers can suggest design changes based on DFM, DFX DFA analysis. These are suggested, so the board is manufacturable with very low to no rework. Both design and manufacturing have their expert
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
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
Electronics Forum | Mon Dec 02 10:45:04 EST 2019 | slthomas
*You* may be well versed, but not every designer is experienced or even familiar with DFM. I don't care how sophisticated the circuitry is, if you can't build it it's a lousy design, and as an EMS we see many designs that shouldn't have passed the
Electronics Forum | Mon Feb 18 07:52:09 EST 2019 | SMTA-Joe
Would increasing the thickness to compensate be a reasonable soulluction? This tarnishing is happening after the first time heat is applied. Could it be a factor of too long in ramp and/or soak?
Electronics Forum | Mon Feb 18 10:11:27 EST 2019 | davef
Whose process is your fab using? Contact [MacDermid, Electrochemicals, In, whoever]
Electronics Forum | Sat Nov 30 10:58:58 EST 2019 | kylehunter
Absolutely not, and if they were able to make it better, than your design isn't sufficient to begin with. Designers design, manufacturers manufacture.
Electronics Forum | Mon Dec 02 00:43:34 EST 2019 | luciano_zhang
The problem is they said what we designed is not qualifyed for production and they have files called "DFM" which is used for the real production to fit with the production line
Electronics Forum | Mon Dec 02 00:44:25 EST 2019 | luciano_zhang
yes I think that make sense but are there any good way to let both sides win?
Electronics Forum | Sun Dec 22 21:17:22 EST 2019 | Elsa
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