Design group do not know the wave is the method of choice for MFG the assembly? Who is th authority select the part? A scary new world! (Almost got heart attack. Ambulance please!) -------------------------- Sent using BlackBerry ----- Original Message ----- From: Bogert, Gerald L [mailto:[log in to unmask]] Sent: Friday, February 11, 2011 11:48 AM To: [log in to unmask] <[log in to unmask]> Subject: [TN] Metallized Plastic Capacitors, DSCC Drawing 09006; to hand solder or not to hand solder February 11, 2011 We have an OEM who wave solders the subject capacitors on circuit card assemblies. The OEM experienced failures during CCA bench testing. A sample of parts was sent back to the capacitor manufacturer who attributed the failure (capacitance value was less than the minimum value required) to excess temperature during the wave soldering process. He stated that his parts should be hand soldered not wave soldered. The soldering profile used by the OEM is set so the top side CCA temperature is < 125C. Since the DSCC drawing rates the parts for 125C maximum, and since the spec also requires 260C dip test for qualification, and since neither the DSCC drawing nor the capacitor manufacture data sheets indicate his parts must be hand soldered, I would have expected that the parts could be wave soldered with no problem. Does anybody have info on what the worst case capacitor body temperature might be for the above situation in wave soldering versus hand soldering? Since these parts are small having two leads on the bottom surface, during wave soldering, the leads would be exposed to approximately 260C solder pot temp, but I have no information on what the worst case cap body temp could be during the normal wave soldering exposure time. I know that this could be determined by adding TC on the cap body but I am just looking for some advice on this issue at this time. [log in to unmask] ______________________________________________________________________ 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.aspx?Pageid=E-mail-Forums 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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------