Marc,
We can't, of course, see your sketch, but because you're having the
supplier specially form the legs, I imagine you've formed them into a gull
wing type configuration and kept the caps as surface mount (albeit a large
one).
For bonding, I recommend Eccobond 45. In my former life, we used it widely
on vulnerable components in the Eurofighter radar. It's an epoxy, rather
than an RTV, as I'm reluctant to use RTV on boards anyway.
Hope this helps a bit.
Pete Duncan
"COWEN,MARC
(A-Scotland,ex To: [log in to unmask]
1)" cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
<marc_cowen@AG Subject: [TN] PTH soldered onto smt pad
ILENT.COM>
Sent by:
TechNet
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07/11/01 06:13
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to "COWEN,MARC
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1)"
Hi All,
We currently have a modification to a PCA where we have added a capacitor.
Unfortunately the only capacitor suitable for this is a through hole
device.
We have therefore asked our supplier to form the legs as follows:
We have had instances where the solder on the left hand leg has not been
sufficient, the leg has come loose and this has worked like a spring. Also
the RTV compound we have also found to be unreliable.
Could some-one please advise of the following:
1. Is there a better adhesive to use instead of RTV compound?
2. Is there a quick and easy way for an inspector to check the solder
joint without placing undue stress on the capacitor legs or the solder
joint? We currently asking inspectors to "gently" try to move the leg while
looking at the solder fillet through a microscope to see if there is a
fracture.
Thanks for your help.
Marc.
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