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


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

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  • \$\begingroup\$ That depends on applications, some smaller frequency circuits, in boards that have high length traces should consider the capacitance of the traces. \$\endgroup\$ – Diego C Nascimento Feb 5 '14 at 4:04
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    \$\begingroup\$ 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. \$\endgroup\$ – Passerby Feb 5 '14 at 4:32
  • \$\begingroup\$ On a multi-layer board, I think internal power and ground planes can have useful values of capacitance. \$\endgroup\$ – Peter Bennett Feb 5 '14 at 7:17

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