Hi all,
we are making a  very vital part for a aircraft builder. Problem with 
TQFPs, some 200 legs. There are resonance peaks that kill the package legs. 
Redesign is not to think of from the customer, so we must do something on 
inside of the box.  One solution (not popular) is to use a string of a glue 
along the leg rows in order to lock them.  Another is to place a vibration 
dampening mat on one side of the board. That one is more tricky , but  there 
is a US  company with lots of stuff for that purpose.  Anyone with 
experience from this area? I should add that not all legs are broken, just 
one or two after 100 hs of random vibration, but that is of course not 
acceptable.  BGAs would solve the problem, but there is no time for 
redesign.
I'm sorry for coming with a  serious message at this holy time of the week.
Thanks
/Inge 


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