Mail Archives: geda-user/2018/07/11/07:53:55
Hello,
It appears that an increasing number of integrated circuits have
Moisture Sensitivity Level 2 or higher.
As I usually only assemble a few reflow-prototypes myself, I end up with
an increasing number of components which are expired MSL-wise.
In simple cases (e.g. SMD LED's) and MSL-2 I usually take the gamble,
and I never had a failure so far.
However, I'm more wary with MSL-3 components, especially the larger
IC's. These are not just more difficult to replace, but can also sustain
damage that doesn't show right away.
I was wondering if people here have experience in this area. Has anyone
had any trouble with MSL-2/3 components? And perhaps someone has some
handy tips for storing these things?
Just for kicks, I'm also building a 'cool-oven', i.e. a styrofoam box
with a Peltier-equipped separation in the middle. The top half will be
the hot side, with a temperature of 60°C (the oven part), and the bottom
some 5°C (the cooling part). The cool section is used for storing a
small jar of solder paste, and the warm section can be used for baking
moisture sensitive components.
Would this work? Or is just heating up the stuff not enough, and do I
need to lower the moisture level in the air as well? (Perhaps this can
be as simple as creating a small air flow from the cool part to the hot
part...)
Any thoughts are appreciated!
Best regards,
Richard Rasker
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