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August 2000

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Subject:
From:
Brooks Bill <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 29 Aug 2000 11:12:59 -0700
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Well, I have seen some interesting problems before... I wonder if you could
show us a component mounted to give us an idea of what the customer is
objecting to...
I have solved some of these problems using "solder dams", a thin line of
soldermask to prevent solder thieving from the close vias...
It would help though to see what the actual problem is... it's hard to
visualize.

Bill Brooks
Senior PCB Designer - [log in to unmask]
Zoneworx, Inc.
40925 County Center Drive, STE 200
Temecula, CA 92591
http://www.zoneworx.com
Tel: (909) 296-1226 x 1037
Co-Director / Education Officer / Webmaster
for the San Diego Chapter of the IPC Designers Council
http://www.ipc.org/SanDiego/index.html
http://home.fda.net/bbrooks/pca/


-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Tuesday, August 29, 2000 11:02 AM
To: [log in to unmask]
Subject: Re: [TN] Castellated Hybrid soldering...


In a message dated 08/29/2000 12:08:39 PM Central Daylight Time,
[log in to unmask] writes:

> 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.

Hi Jim!

As you can see from the pictures I have up, I've got exposed copper all
along
those edges where they want a fillet, plus all them via's in that grounding
pad to suck all the solder down during reflow...so it's next to impossible
to
get any decent fillets.

There is plenty of paste beneath the part, so I assume there's a good ground
connection from the device to the board....just don't have nice pretty
fillets along the sides. Is it really that important that there be the side
fillets along the body for the device to work?

The reason I ask is because we've been building this board for as long as
I've been here (hundreds and hundreds of boards) and this is the first time
this problem has popped-up. Nothing has changed in the process over this
time.

I use a 6-mil stencil because there's 0402 components all over the board
too.

I believe what started everything was that a technician said that he was
having problems tuning the board, and he said that the problem was because
there was no side fillets on the bodies of these couplers.

BTW, there isn't anything on the drawing that calls this out.

-Steve Gregory-

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