Product parameters:
Number of layers: 4 layers
PCB or FPC: PCB
Material: FR4 TG> 135
Finished thickness: 1.78MM
Surface copper thickness : inner layer 1/1OZ, outer layer 0.5OZ
Copper thickness in the hole: ≥20um
Line width/line spacing: 4MIL/4MIL
Minimum hole diameter: through hole 0.2MM
Color : solder mask black, silk screen white
Surface Finish : immersion gold
Immersion gold thickness: 2U ”
Product details: Internal and external impedance control