Hi Toby: 1) Does "failure" mean a) "stops working but will come back to life with power and/or software reset" or does it mean b) "damaged"? 2) Is this a system-level test? If it is a system-level test and 1a is true, then you have a gross system level problem such as non-repeatable shielding performance of chassis, poorly connected video cable, screws or conductive gaskets left out, etc. Less likely - perhaps inconsistent operator test method - air discharge ESD has been extensively researched and has many uncontrolled parameters which leads to poor repeatability from test to test. But 1kV versus 25kV is so huge a spread you would really have to be trying to mess up on purpose :-) Best Regards Lee SILENT 10 Northern Boulevard, Suite 1 Amherst, NH 03031 USA +1 (603) 578-1842 (v) +1 (603) 578-1843 (f) +1 (508) 341-3947 (m) [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Toby Carrier Sent: Friday, July 17, 2009 1:51 PM To: [log in to unmask] Subject: [TN] ESD failure difference between 16-QSOP and 16-SOIC Video Buffer Hi, Does anyone have an idea why a 16-SOIC Video buffer would pass ESD testing with being kludged in, compared to a 16-QSOP package of the same part actually soldered to the PCB? The SOIC part passes a Chassis and Common ground Air Gap event up to 25kV, but the QSOP part has failures on both chassis and common at 1kV and less? I would appreciate any articles or explanations that you might have. Thanks Toby Carrier Engineering Technician --------------------------------------------------- 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 -----------------------------------------------------