Technical Information

Positional tolerances

Printed circuit boards and multilayer boards are complex products, manufactured in a long series of processing steps involving the most different build-up technologies. The plated-through hole (PTH) pattern for through-holes crosses all layers and levels of the board und thus serves as a positional reference for all other patterns. The positional tolerances derived hereof are defined as follows:

PTH pattern to copper pattern of outer layers	< 50µ
PTH pattern to copper pattern of inner layers	< 75µ
PTH pattern to solder resist mask	< 50µ
PTH pattern to component notation printing	< 200µ
PTH pattern to special printing	< 200µ
PTH pattern to milling pattern	< 100µ
PTH pattern to scoring pattern	< 150µ
PTH pattern to buried vias	< 75µ
PTH pattern to blind holes	< 50µ

Note:
More technical details in Design-Rules.