Alpha rev.04 PCB Description:

Number of layers:  8
Type of material:  FR-4
Board thickness:   1.6 mm
Board size:        99.5 x 122.0 mm
Surface finish:    ENIG
Outer layers:      35 um
Inner layers:      35 um
Soldermask side:   Top & Bottom
Soldermask color:  Green
Silkscreen side:   Top & Bottom
Silkscreen color:  White
Smallest track:    0.15 mm
Smallest drill:    0.25 mm
Smallest gap:      0.1 mm
Extra:             0.25 and 0.5 mm vias must be plugged
                   according to IPC4761 type VII ("via in pad")