This entry was posted on Tuesday, June 30th, 2009 at 7:40 pm and is filed under PCB FAQ. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
i am having to store them in an uncontrolled environment at 75-85deg and 80+% humidity seems like i am having a lot of fallout could this be why?
June 30th, 2009 at 9:55 pm
80% humidity is very high, high enough so that you can be getting condensation on the board.
If this is trapped into places like between ICs and the board, and has not evaporated at the time the boards is powered up, it can cause problems.
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July 1st, 2009 at 4:13 am
I’m not certain what you mean by fallout, but I will answer assuming you mean faulty boards.
Your temperature range is really not an issue, naturally cooler and more stable would be better - but I highly doubt temperature as your culprit.
The 80+% humidity is fairly concerning, however. But I don’t see it causing major issues unless you are using the board in the same environment. High humidity can cause condensation if you have large temperature swings/differences (ie, the boards in a cold room with the sun shining in on them…again unlikely).
The proper way to store your boards would be in static protective bags and kept inside of a cool, dry, room.