IPC-2222 10.1.1 Edge Spacing Except for edge-PB contacts, the minimum distance between conductive surfaces and the edge of the finished PB, or a NPTH, shall not be less than the minimum spacing specified in Table 6-1 of IPC-2221 plus 0.4 mm. PBs that slide into guides shall have a minimum external conductor to guide distance of 1.25 mm or minimum electrical clearance (see Table 6-1 of IPC-2221), whichever is greater. Special design applications in areas such as high voltage, surface mount, and radio frequency (RF) technology may require variances to these requirements. Ground and heat sink planes may extend to the edge when required by design. Craig Sullivan wrote: > I can't seem to find this information in any IPC document, unless I am > obviously overlooking it. > > We have a PCB customer designed with a trace close to the board edge > (0.013"). However, when the board is scored for depaneling, the score width > reduces the distance to around 0.005" - 0.007". > > Can anyone recommend a reference or design guideline that specifies > something like this? Something that may specify how close features can be > placed to the board edge? > > We have our own guidelines for DFA, and generally speaking, we've never run > into anything this tight where it's become a cause for concern. But there's > also a first time I suppose. > > Thanks in advance for the input. > Craig > > --------------------------------------------------- > 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 -----------------------------------------------------