Stevenage Circuits - Taking Technology Further

Gold Line Bare Board Testing Bare Board Testing

Capability and Design Guidelines

Current Technology

Maximum number of layers: 36
Minimum track: 75µm (3 mil)
Minimum gap: 75µm (3 mil)
Smallest mechanically drilled holes: 150µm (6 mil)
Smallest mechanically drilled blind holes: 150µm (6 mil)
Smallest laser drilled holes: 25µm (1 mil)
Smallest laser drilled blind holes: 50µm (2 mil)
Smallest buried holes: 25µm (1 mil)
Aspect ratio max - through holes: 16 : 1 (FHS)
Aspect ratio max - blind holes: 1 : 1 (FHS)
Drilled hole edge to copper (M/L rigids): 175µm (7 mil)
Drilled hole edge to copper (F/Rs): 225µm (9 mil)
Controlled Impedance <Read More> +/- 10%
Vias in S/M pads  
Planar transformers  
Chip on-board and component in-board  
Edge plating  
Edge plated half holes  
Edge plated fingers  
Buried resistors +/- 3%
Solder resist laser ablation  
Resin filled vias  
Laser structuring (copper pattern and solder resist)  
Copper filled blind vias