PCB Layout Question
PCB Layout Question
(OP)
Hi.
I am having trouble finding recommendations relating to the minimum spacing betwee the edge of a PCB (PWB) and the tracks or ground/powerplanes.
Any information would be much appreciated.
I am having trouble finding recommendations relating to the minimum spacing betwee the edge of a PCB (PWB) and the tracks or ground/powerplanes.
Any information would be much appreciated.
Steve Bull
Quality and Circuit Engineer.





RE: PCB Layout Question
RE: PCB Layout Question
I hope this helps some.
RE: PCB Layout Question
As I said, any further details(Mil Specs etc.)would be a great help.
Steve Bull
Quality and Circuit Engineer.
RE: PCB Layout Question
From IPC-2222:
10.1.1 Edge Spacing
Except for edge-board contacts, the minimum distance be conductive surfaces and the edge of the finished board, or non-plated through hole, shall not be less than the minimum spacing specified in Table 6-1 of IPC-2221 plus 0.4 mm. Printed boards that slide into guides shall have a minimum external conductor to guide distance of 1.25 mm or minimum electrical clearance (seeTable 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 requir variances to these requirements. Ground and heat sink planes may be extended to the edge when required by design.
When I design multi-layer boards, I leave at least a .025" gap from power/ground planes to the edge of the board to allow for tolerances so that these do not go all the way to the edge and potentially cause a short.
Regards,
Steve Smith
Product Engineer
Staco Energy Products Co.
www.stacoenergy.com
RE: PCB Layout Question
Thanks very much for the posting, it was exactly what I was hoping for.
Best Regards,
Steve Bull
Quality and Circuit Engineer.
RE: PCB Layout Question
RE: PCB Layout Question
HumiSeal spray. It is a thinner coat but does a very good job as a moisture barrier.
RE: PCB Layout Question
Lewis