Tips Multilayer Tips B.E.C. Manufacturing

Multilayer Tips

Balancing Copper

When designing multilayer PCBs it is recommended to balance the copper area of internal and external layers. This should be done by the use of a cross hatch rather than a solid copper plane. When using a cross hatch ensure that the track width used is greater than 6 thou. A preferred width is 10 thou.


Specifying tight track width/spacing simply decreases the yield from a panel and raises costs. We recommend that you use 8 thou (or higher) track/space but in general the larger the track/space, the higher the yield and the lower the cost. On Multilayer boards, a clearance from internal pad edge to the internal copper plane of 10 thou is required. This will almost certainly avoid the chance of internal shorting or breakout.