Not sure, but I surely find this to be an IPC contradiction. Who is to say
that it was by design - maybe some operator/manufacturer short-cut their
process or forgot about it altogether?. A similar problem arises when
pre-plated leads are bent, possibly encouraging fillet problems - the place
where the main joint strength is supposed to be!
As an EMS provider, we have had fights with customers complaining about
similar situations as yours on parts they supplied, but customers tend to
think that it is always an assembly process problem.
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, October 24, 2002 4:07 PM
To: [log in to unmask]
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- --------------------------------------------------- Technet
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