Good info, Guy. This gives me something I can submit for consideration by our executive management staff. Thanks, everyone, for your help. I can always depend upon this board to help me through my week! Leland -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey Sent: Thursday, July 31, 2008 3:52 PM To: [log in to unmask] Subject: Re: [TN] Repair Need for Inverted Chip Resistors The IPC standards committees had long discussions on this topic. A group was tasked to evaluate your concerns and others, like vertical versus horizontal alignment of the plates in multilayer ceramic capacitors. No manufacturer voiced concern over reliability or performance of either resistors or capacitors. One member attempted the quantify the performance of capacitors in RF applications and found no difference. The committee voted to relax the workmanship requirements in response. Since that time, I used a thin film precision resistor where the maker recommend mounting with the resistive element down. I asked about this and the response was "it provides and measure of protection for the thin resistive element." -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall Sent: Thursday, July 31, 2008 3:12 PM To: [log in to unmask] Subject: Re: [TN] Repair Need for Inverted Chip Resistors Dewey and others, I've been told the concern lies with the resistive element being on top of the component. With it being mounted upside down, the hottest portion of the part when under power is in direct contact with the board. Would this lead to shortened life or cause any type of a premature failure? Are we being over-cautious about this, or is there some truth to what I'm being told? Leland -----Original Message----- From: Whittaker, Dewey (EHCOE) [mailto:[log in to unmask]] Sent: Thursday, July 31, 2008 2:00 PM To: TechNet E-Mail Forum; Leland Woodall Subject: RE: [TN] Repair Need for Inverted Chip Resistors I'll try to be discreet. If there is no functional impact, then a "let the chips fall where they may" approach is acceptable. If the part markings are not visible or the vision recognition algorithm of an AOI machine is impaired, then they may be a problem. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall Sent: Thursday, July 31, 2008 10:12 AM To: [log in to unmask] Subject: [TN] Repair Need for Inverted Chip Resistors TechPros, Can anyone tell me if there's a reliability concern with allowing chip resistors to be mounted upside down? Our current policy requires that we repair these, and I feel that to be unnecessary. IPC-A-610D shows this to be an acceptable condition on all classes of product, and our customer has no specific contractual requirement. I'd like to try to change this policy at our facility, and welcome any commentary you might have on the subject. Thanks in advance for your help, Leland Woodall --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------