Hi Steve! Ooh - good time for a soapbox! I had the opportunity to
participate in the J001C revision discussion of this issue and quite a
discussion it was! As Mel Parish pointed out, the 001C specification does
not require a side fillet and therefore the committee felt that the
nonwettable side statement was more of a statement than a requirement thus
it should not be included in the specification. I presented that opinion
that the only 001 specification included the nonwettable side statement and
that the statement provided a large number of assembly folks a logical,
science base reason for not having formed a solder joint side fillet. As
other TechNet comments have echoed most assemblers would rather not have
components with sheared sides but many times are not given a choice. Alas,
specification development by democracy is not always a perfect process and
I will be re-submitting a 001 comment to reinstate the nonwettable side
statement in the specification. I suggest other folks who feel that the
nonwettable side statement provides benefit should also make their opinions
known to the 001 committee during the specification revision comment
process. Ok, time for another Diet Coke!

Dave Hillman
Rockwell Collins
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Steve Gregory <[log in to unmask]>@ipc.org> on 10/24/2002 09:06:34 AM

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Subject:    [TN] Side and Toe Fillets...


Hi All!

I've got a situation here with a SMT socket. It's a SAMTEC CLT-105-02-L-D.
The leads are made from stamped pre-plated stock, so the sides and toes of
the leads have exposed copper, and of course doesn't wet during reflow.

In J-STD-001B, it used to say under 9.2.6.1 Flat, Ribbon, "L" and Gull Wing
Leads:
"Leads not having wettable sides or ends by design (such as leads stamped
or sheared from pre-plated stock) are not required to have side or end
fillets.

In J-STD-001C it has no mention of that under the same section, in
J-STD-001C the section number has changed, it's 9.2.6.8.

So if you have leads that are made from pre-plated stock and have the sides
and toes not wet because of the exposed copper, is it now a defect? If it
is, how in the heck are you going to get the sides and toes to wet?

Thanks!

-Steve Gregory-

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