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谁知道FR-4PCB板顶层和底层间的耐压强度是多少？
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四层板，FR-4层厚大约5.6MIL,之间加-90V电压不知行不行
PCB Design Tutorial by David L. Jones Page 9 of 25
Fornon-mainsvoltages,theIPCstandardhasasetoftablesthatdefinetheclearancerequiredforvarious
voltages.Asimplifiedtableisshownhere.Theclearancewillvarydependingonwhetherthetracksareonan
internallayersortheexternalsurface.Theyalsovarywiththeoperationalheightoftheboardabovesealevel,
duetothethinningoftheatmosphereathighaltitudes.Conformalcoatingalsoimprovesthesefiguresforagiven
clearance,andthisisoftenusedonmilitaryspecPCBs.
ClearancesforElectricalConductors
Voltage(DCorPeakAC)InternalExternal(<3050m)External(>3050m)
0-15V0.05mm0.1mm0.1mm
16-30V0.05mm0.1mm0.1mm
31-50V0.1mm0.6mm0.6mm
51-100V0.1mm0.6mm1.5mm
101-150V0.2mm0.6mm3.2mm
151-170V0.2mm1.25mm3.2mm
171-250V0.2mm1.25mm6.4mm
251-300V0.2mm1.25mm12.5mm
301-500V0.25mm2.5mm12.5mm
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