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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 29 Aug 2000 13:07:43 -0400 |
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Steve, you're right that 610 doesn't address this issue. We use this type
of device quite often, and to operate properly (RF stuff, you know...) the
entire body of the component must be soldered down, with a nice fillet all
around. This requirement should be documented on the drawing, however.
Thanks,
Jim M.
-----Original Message-----
From: Stephen R. Gregory [SMTP:[log in to unmask]]
Sent: Tuesday, August 29, 2000 10:21 AM
To: [log in to unmask]
Subject: [TN] Castellated Hybrid soldering...
Mornin' all!!
Notice I didn't say "Good" mornin'...mine is started off as
usual...SNAFU. We
build this RF board here that has what's called a 90° Hybrid
Coupler. It's
from a company called Anaren and it's trade named a ZingerŪ.
Basically it's a
surface mount metal bodied ceramic filled part that gets its body
soldered to
one big via filled pad that connects to a ground plane, and then
there are
four castellations at each corner (which are the RF pads of the
device) that
are soldered to very wide traces.
Well, we've been told that we're getting boards back because the
soldering
doesn't meet -610 class 2, and that there should be a continuous
fillet
completely around the portion of the body of the part that is
connecting to
the ground plane.
I say there isn't anything in the -610 that applies to that.
I've got some pictures up so you can see what I mean. Go to:
http://www.driveway.com/share?sid=4eced0a4.94f42&name=Pictures
There's a picture called Pasteprint.jpg that shows the footprint on
the
board, you'll see the big grounding pad in the center, and the four
corner
pads where the RF pads of the device connect to. The other picture
is called
bubblyplating.jpg and is a close-up of one of the castellations that
have
this bubbly looking plating on them...anybody ever seen that before?
The
other picture is called exposedcopper.jpg and is a side view of the
device
that shows exposed copper along the edges of the device...and that's
where
they say we don't meet IPC spec's, they say we should have a
continuous
fillet all along those edges. I don't have a problem meeting their
spec's if
that's what's required for the board, but I do have a problem when
they say
it doesn't meet IPC spec's, because this is such a weird part and
weird
footprint, I don't believe the -610 addresses it.
-Steve Gregory-
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