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If capacitors are just two conductive components sandwiching an insulator, then why aren't all PC board, or at least their traces, considered capacitors?

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marked as duplicate by Passerby, PeterJ, Nick Alexeev, Chetan Bhargava, Leon Heller Feb 5 '14 at 8:50

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who said PCBs weren't like caps? they simply exhibit a very low non-uniform capacitances – hassan789 Feb 5 '14 at 4:29
up vote 7 down vote accepted

They are, but only noticeable in very high frequencies (microwave wavelength or GHz).

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That depends on applications, some smaller frequency circuits, in boards that have high length traces should consider the capacitance of the traces. – Diego C Nascimento Feb 5 '14 at 4:04
If by very high frequencies you mean a few hundred kilohertz. High Trace/Bus capacitance can cause issues in even low speed 100khz i2c for example. – Passerby Feb 5 '14 at 4:32
On a multi-layer board, I think internal power and ground planes can have useful values of capacitance. – Peter Bennett Feb 5 '14 at 7:17

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