http://www.sandia.gov/media/rhp.htm -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard Sent: Monday, September 26, 2005 12:06 PM To: [log in to unmask] Subject: Re: [TN] X-ray inspection, can it damage devices? I have had to address the same concerns for Aerospace programs. I have not been able to find any formal standards for radiation exposure limits. All I found was a good paper on the subject from Tom Clifford at Lockheed Martin ("X-Ray Inspection, Easy Does It" in EP+P magazine) I also talked to two X-ray vendors and they tell me that even if the typical X-rays were cranked up to 120kv or about 3-5 watts, a component would have to be exposed for a full day or longer to accumulate enough total Rems such that it could hurt the component, and that the only types of components that could be possibly damaged would be CMOS memory. I have found some information on protecting components in space systems from natural X-rays, but nothing on process-generated X-rays. Everybody tells me it is not a problem. This is not enough for me, so I asked the folks at IPC but have not heard a response as yet. Anyone else know of any standards for limitations of X-ray emissions on electronic components? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Monday, September 26, 2005 10:17 AM To: [log in to unmask] Subject: [TN] X-ray inspection, can it damage devices? Good Mornin' Everyone! I hope you all had a good weekend! I worked Saturday, but had Sunday off. Sat around Sunday and watched the NASCAR race at the "Monster Mile" in Dover Delaware. 20-year old Kyle Busch gave Jimmie Johnson a run for his money finishing second at the green/white/checkered ending....but I digress..... Anyways, we built an assembly here that has a .050" copper core in the center of it...not the same assembly as the one I did my "okie cross-section" on). It is double-sided SMT, and has BGA's on both sides. I'm doing x-ray inspection with a Fein Focus Tiger 160, and in order to penetrate the core and do a proper inspection of the solder joints and spheres of the BGA's, the x-ray power is up around 120-130kv. Our customer received a number of the assemblies from us (without test from us, as they are prototypes and test hasn't been developed yet), and they are having problems with one of the BGA's. It's a 100-ball Max-7000 device from Altera, a CMOS EEPROM, and our customer has been trying to program the device via on-board programming, but some boards wont program. The x-ray inspection turned out fine. All BGA's were inspected using oblique angles, so if there was an open joint, it would have been seen. They are worried that maybe the x-rays may have damaged the device. Altera has told our customer that the x-rays shouldn't hurt the device. I've got a case number started via email in to Altera (since I can't talk to anyone on the phone), asking them myself if x-rays will damage the device. I'm also going to call Fein Focus and talk to them as well. But have any of you ever heard of x-ray damaging BGA's? Kind regards, -Steve Gregory- Senior Process Engineer LaBarge Incorporated Tulsa, Oklahoma (918) 459-2285 (918) 459-2350 FAX __________________________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------