Bev, my feeling would be that if the other surfaces of the lead exhibited proper wetting and the only issue was a bulbous heel fillet, for the reasons you've outlined, and provided a cross section showed proper intermetallic formation (I'm assuming Cu leads) in the heel region then I don't think I would necessarily fail it on qualification. It would though probably lead to confusion amongst operations personnel with what is and isn't acceptable from an inspection standpoint and for that reason I'd have to think about it. Regards Ian -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian Sent: 26 March 2010 01:58 To: [log in to unmask] Subject: Re: [TN] Need some opinions Steve, Gull wings. Yes, cheap, cheap cheap! Bev ----- Original Message ----- From: TechNet <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Sent: Thu Mar 25 21:49:18 2010 Subject: Re: [TN] Need some opinions Hi Bev, Don't leave us hanging, what components are you seeing that with? I'd like to have a "heads-up". This begs the question, why do you think they are doing that? Are things getting so tight that they're trying to pinch a penny by reducing plating coverage? Hmmmm... Steve ----- Original Message ----- From: "Bev Christian" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, March 25, 2010 9:08 PM Subject: [TN] Need some opinions > Technetters, > It seems that more and more component suppliers are not plating their > leads > all the way up to the component body. In fact some are getting downright > skimpy and only plating to the bottom bend, never mind the upper one. If > you > put down a lot of solder paste you end up with a bulbous joint, a negative > wetting angle and a stress concentration point. If you put down less paste > and have a co-planarity issue, then you have the potential for opens. The > other option of course is getting the supplier to plate higher up the > leads. > > Question: would you consider the condition of the formation of the > negative > wetting angles a failure during process qualification? > > Bev > RIM > > > ______________________________________________________________________ > 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 ----------------------------------------------------- --------------------------------------------------------------------- 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 message (and any attachment) is confidential and is intended for the named recipient only. If you receive it in error please e-mail back the sender and permanently delete the original message and any copies. Rolls-Royce Goodrich Engine Control Systems Limited. Registered Office: Moor Lane, PO Box 31, Derby, DE24 8BJ. Registered in England No. 06686268. -------------------------------------------------------------------------- ______________________________________________________________________ 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 -----------------------------------------------------