> > > What is the maximum vibration level and/or G force standard smt or
> >thruhole
> > > will tolerate ?

I could look up what we spec'ed for some electronics that had to be lauched
in a shuttle, but IIRC the circital point is not so much a single solder
joint but the amount of mass and area that can vibrate freely: small
chips(let's say up to DIL20) were not considered a problem at all (but
sockets were definitely out of the question, and definitely use
plated-through holes or even better solder both sides), wide DILs and larger
SMDs were regarded as potential problems (maybe even all SMDs), and so were
torroids and other things with more mass. And of course a substatial area of
PCB was a problem in itself, so there were metal supports that partitioned
the PCB so any part of a PCB was no more than a few centimeters from a
support. And I don't think this was done in our case, but I would put one of
the PCB axis pointing into the flight direction. And avoid Crystals or even
ceramic resonators. I guess the 12c508 build-in oscillator will be accurate
enough?

Note that you will have much more G force and much less vibration that we
had, so your problem area's might be a little bit different. A pity that you
will not likely have a failed PCB for post-mortem analysis.....

Wouter van Ooijen
--
Van Ooijen Technische Informatica: http://www.voti.nl
Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen

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