Daan,
The vendors of ceramic chip capacitors are going to tell you >2C/sec. is a "No-No" but I can't believe that 2C/sec. is okay and 3C/sec. isn't especially for 0805 caps
Regards,
George
George M. Wenger (908)-546-4531
Reliability Engineer
RF Power Amplifier Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059
[log in to unmask]
-----Original Message-----
From: d. terstegge [mailto:[log in to unmask]]
Sent: Thursday, September 04, 2003 11:33 AM
To: [log in to unmask]
Subject: [TN] Preheat of ceramic chip capacitors
Hi Technet,
I just saw a specification for the soldering profile for a simple
0805-sized ceramic chipcapacitor. It mentions a maximum preheat ramp,
both for wave and for reflow soldering, of 2 degrees Celcius per second.
In the beginning of the slope, for some of our products, we go slightly
higher than this.
One of our customers now thinks that the preheat ramp being steeper
than the component suppliers specification must be the reason for
malfunctioning of this specific part.
I won't annoy you with all the discussions we had and the
investigations that we've done, I just hope to get an answer to the
following question: is it possible that a preheat ramp of 3 °C/s results
in failures (but without any visible damage) of 0805 ceramic
chipcapacitors ?
Best regards,
Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net
---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------
------------------------------------------------------------------------------------------------
This message is for the designated recipient only and may
contain privileged, proprietary, or otherwise private information.
If you have received it in error, please notify the sender
immediately and delete the original. Any unauthorized use of
this email is prohibited.
------------------------------------------------------------------------------------------------
[mf2]
---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------
|
