Designing for high-volume manufacture

When designing for high voltage on FR4 it’s important to use PCB design rules to ensure adequte clearance. FR4 when new and clean typically has a dielectric rating in the range of 800-900V per mil (that’s thou!), but due to ageine effects, a 300v limit is ┬ámore realsitic. With a typcial PCB stackup, that’d mean about 2.1kV for a sinlge later of 7 mil pre-preg – which is pretty astonishingly high for good ol’ FR4! Of course, thats layer-to-layer, and not track separation…

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