Hi Lance, as stated on page 5-16, Note 2 beneath Table 5-2, states, for
plated through hole boards greater than 2.3 mm [.0906"] thick, components
with pre established lead lengths, lead protrusion may not be discernible.
The drive is for thick boards, if the leads of IC and such don't come
through you should be able to make some determination from the top side to
see if in fact the component has been soldered in place. If you can show
that they are soldered and the leads don't come through you have a process
indicator. Process indicators don't have to be fixed, however some action
should be started to make sure the component leads are of correct length. If
they are not, then states so in your master drawings and then that document
overrides the 610 document.
That is not however a good practice because you really don't know whether
you have a consistently good solder joint every time all the time.
Hope this helps.
Good luck and keep us posted.
Leo Lambert
Technical Director
EPTAC Corp.
Longfellow Square, Bldg. II
8025 So. Willow St., Unite 207
Manchester, NH 03103
P. 603-296-0887 ext 15
F. 603-296-2377
[log in to unmask]
www.eptac.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Lance Mayes
Sent: Thursday, March 04, 2004 4:34 PM
To: [log in to unmask]
Subject: [TN] Lead Protrusion
Importance: High
TechNetters:
I have a question on lead protrusion. We have ordered in components that
does not come through the PCB like it states in IPC-A-610C, 5.2.7.1,
figure 5-34. It is more along the L Min in the figure 5-34. Is this
acceptable for Class 2 manufacturing? I told my supervisor this is a
process indicator and should be corrected but he wants some more input and
so do I before we give the go ahead. Anxiously waiting.
Thanks
P. Lance Mayes
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