18L

parameter
Layer: 18 l
Material: FR4 Tg70.
Thickness: 2.0 mm
Copper thickness: 35/18/18/35um.
Line width: 3.5/4 mil.
Most holes: 0.2mm
Surface treatment: ENIG(2U')
Technical difficulties: photovoltaic products, 5G high frequency,
Jangdan gold finger, local thick copper impedance.