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Dielectric strength of PCB perpendicular vs parallel
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Mar 11.2020, 21:24:53
Laminate suppliers only list one "Dielectric Strength" so I assumed that orientation didn't matter.
Then I discovered that there are two voltage breakdown tests. Test method IPC TM-650 2.5.6.2 is used for testing perpendicular to the plane and 2.5.6 parallel to the plane.
The 2.5.6 test appears to have a much lower passing threshold. So much so that IPC2221B guidelines for internal clearances come into question.
Does the claimed "Dielectric Strength" value of a PCB laminate really only apply to voltages perpendicular to the plane (2.5.6.2)?
Is there another name for the test results of 2.5.6?
Thank you.
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