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By certification 
Product name: Impedance pcb Board
Specifications
Layer count: 8
Board thickness: 4.0mm
Base materials: FR4 S1000-2
Finished size: 400*400mm
Surface finish: mmersion
Line width/line space: 5/5mil
Minimum hole: 0.35mm
Solder resist color: Sensitive green
Cu thickness: inner layer 1 OZ outer layer 1 OZ
Characteristic
there are various impedance line in both the internal and external layer , and various impedance control requirment.
accurate impedance control, the impedance tolerance is 100 ohm+/-5%，50 ohm+/-5 ohm
the integration of the board design is very high, thick diameter ratio of more than 10:1, heavy copper plating is difficult
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