Single-sided PCBs

At overhead expenses

Basic copper Final copper (1)Min. ring (2)Basic copperFinal copper (1)Min. ring (2)


1. Final copper

2. Min. ring

3. Final diameter of the hole after plating and soldering 


For reason of the mechanical strength the pads are recommended to have a larger remaining ring compared with similar ones in a copper-plated PCB. 


Recommend values (example):


Min. hole0.8mm      +0.1/-0.0mm (32mil)
Drill widening                                             +0.05mm
Drill diameter                                             =0.85mm
Min. ring  ? 2                                              + 0.30mm ? 2 = 0.60mm
Min. pad                                                     =Ø 1.45mm