Alejandro,
We, too, have recently had coplanarity problems with a multi-leaded SMT
transformer from one of our suppliers. The 0.004" spec was quoted by them as
well, and unfortunately they were probably within this tolerance (which is,
of course, really 0.008 - that is +/- 0.004"). We had them change the lead
pitch a bit to angle the lead down into the solder paste to help relieve an
insufficient solder situation on most of the reflowed devices. It looks like
you're running into the same type of situation with reduced solder mass at
the solder junction with the leads. Might try the lead pitch trick to see if
it helps your situation a bit. Definitely helped ours...

Dale Ritzen
Quality Manager
Austin Manufacturing Services


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Becerra Alejandro
(TTE)
Sent: Monday, November 08, 2004 8:58 AM
To: [log in to unmask]
Subject: [TN] Coplanarity for SMT connectors


Hello,
We are having solderability problems with a SMT connector.
The coplanarity spec is 0.004" (0.10mm).
The solderability problems are related to Non solder in the lower part of
the terminals.

Regards

Alejandro Becerra

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------