This ASSUMES that this is a turnkey product...
If not, all bets are off...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Friday, September 17, 2010 11:19 AM
To: [log in to unmask]
Subject: Re: [TN] Crack and oxidisation on IC leads
Wow, your subcon is very scary! Are they legally binding for all the potential fall out? Check their legal fee or insurance, may be they are the one willing to fight in the court or got fat wallet ready to pay all the warrantees and damages. You got stuck this time, may be next time choose subcon wisely? (don't tell me your contract dept went to the cheap bid).
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Friday, September 17, 2010 1:46 PM
To: [log in to unmask]
Subject: Re: [TN] Crack and oxidisation on IC leads
The subcon will not remove the IC for a cross-section as they do not think the IC will have any reliability or functionality issue. They want me to waive off my observation so that the IC can stay on the board and to be used.
I have no reliability background but what I observed do disturb me. It has the potential to cause this PCBA to fail during its field operation. This is the rationale I reject this component. Unfortunately, the subcontractor is hard to convince.
Thanks and Regards,
~ Wee Mei ~
_____
From: TechNet on behalf of Werner Engelmaier
Sent: Sat 9/18/2010 1:28 AM
To: [log in to unmask]
Subject: Re: [TN] Crack and oxidisation on IC leads
Nee hao Wee Mei,
When beding leads over a small radius, surface cracks can occur if the lead material is not at least quarter-hard annealed or softer-these cracks typically do not cause any problems. HOWEVER, the photos you sent Steve show cracks substantially more severe-I concur with Vladimir that cross-sections are definitely called for to make a more accurate assessment.
Werner
-----Original Message-----
From: Lum Wee Mei <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, Sep 17, 2010 8:07 am
Subject: [TN] Crack and oxidisation on IC leads
Dear All,
During PCBA inspection, we noticed cracked line across the entire IC lead width
at the knee location. It happen to the whole row on one side of the IC and we
consider it a reject. However, our production subcontractor do not concur the
component as reject. They said that the crack is only fine line and is unlikely
to cause any major physical issue to the leads itself.
In another IC, we noticed a small area of oxidation on one of the lead of about
1 - 1.5mm in size. Again the subcontractor do not accept our decision that it is
a reject. The reason given by them is that although the corrosion exposed the
base metal it is acceptable because the exposed surface is not part of the
required solder fillet.
I have tried to upload the photo on IPC Technet but not successfully. Hope from
your experience, you can provide some opinions.
Thanks and Regards,
~ Wee Mei ~
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
==============================================================================
This email and any attachments thereto may contain private, confidential, and
privileged material for the sole use of the intended recipient. Any review, copying,
or distribution of this email (or any attachments thereto) by others is strictly prohibited.
If you are not the intended recipient, please contact [log in to unmask]
immediately and permanently delete the original and any copies of this email and
any attachments thereto.
==============================================================================
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
|
