Hi Dave,
Don't believe everything you read—that 3%-thing is a gross 'rule of thumb' with all kinds of caveats.
Werner
-----Original Message-----
From: Dave He <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Dec 22, 2009 11:45 am
Subject: [TN] Gold removal of SMT component
Hello,
I have a question about tinning the gold-plated SMT component as specified
in J-STD-001, 3.9.3 bullet 2.
As more and more SMT components, such as crystal, oscillator, inductor and
connectors, are gold plated, the tinning becomes more and more difficult,
especially for fine pitch components. Some gold plating is only 2-3 u" thick
per the mfr. Some white paper also mentions if the gold is less than 3 wt%
of the solder joint, there is no chance of embrittlement.
I am searching professional idea for the gold removal on SMT component, will
it be terminated if the thickness is less than a certain level? Thanks.
Best regards,
Dave He
Process & Manufacturing Engineer
Smart Electronics & Assembly, Inc.
2000 W Corporate Way
Anaheim CA
92801
Phone: 714-991-6500 ext 333
Fax: 714-518-5411
www.smartelec.com
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 15.0
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
-----------------------------------------------------
|