[SI-LIST] Re: copper-to-copper separation
- From: Jeff Seeger <jseeger@xxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 02 Aug 2002 14:30:02 -0400
,
The spec this came from has been superceded by IPC-2221,
available through http://www.ipc.org . It is at least
useful for order of magnitude and really hasn't changed
much in the >31 volts values.
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This is from ANSI/IPC-D-275.
Voltage Spacing (FR4)
B1 B2 B3 B4 A5 A6 A7
0-15 0.1mm 0.64mm 0.64mm 0.13mm 0.13mm 0.13mm 0.13mm
16-30 0.1mm 0.64mm 0.64mm 0.13mm 0.13mm 0.25mm 0.13mm
31-50 0.1mm 0.64mm 0.64mm 0.13mm 0.13mm 0.38mm 0.13mm
51-100 0.1mm 0.64mm 1.5mm 0.13mm 0.13mm 0.5mm 0.13mm
101-150 0.2mm 0.64mm 3.18mm 0.38mm 0.38mm 0.75mm 0.38mm
151-170 0.2mm 1.27mm 3.18mm 0.38mm 0.38mm 0.75mm 0.38mm
171-250 0.2mm 1.27mm 6.4mm 0.38mm 0.38mm 0.75mm 0.38mm
251-300 0.2mm 1.27mm 12.7mm 0.38mm 0.38mm 0.75mm 0.38mm
301-500 0.25mm 2.54mm 12.7mm 0.75mm 0.75mm 1.5mm 0.75mm
>500 0.0025mm/V 0.0254mm/V 0.00305mm/V 0.00305mm/V
>500 0.005mm/V 0.00305mm/V 0.00305mm/V
B1 Internal Conductors
B2 External Conductors, uncoated, sea level to 10,000 feet
B3 External Conductors, uncoated, over 10,000 feet
B4 External Conductors, with permanent polymer coating
A5 External Conductors, with conformal coating over assembly
A6 External Components lead/termination uncoated
A7 External Components lead/termination with conformal coating
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Regards,
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
jseeger "at" appliedcad "dot" com 978 649 9800
President, Greater Boston Chapter, IPC Designer's Council
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