Printed circuit board with tin pads

#1. Technical Field

#The present disclosure relates to printed circuit boards, more particularly to a printed circuit board that can reduce electromagnetic interference.

#2. Discussion of the Related Art

#The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present printed circuit board. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

#FIG. 1 is a partial top view of a printed circuit board in accordance with one embodiment of the present disclosure.

#FIG. 2 is a partial bottom view of the printed circuit board in FIG. 1.

#Referring to FIGS. 1 and 2, one embodiment of a printed circuit board 10 of the present disclosure includes a main body 12. The main body 12 defines a through hole 14 and a plurality of conductive vias 16. The conductive vias 16 are defined around a periphery of the through hole 14, and are arranged in a ring and substantially evenly spaced apart in one embodiment. The through hole 14 is configured for connecting to a grounding component, so that the printed circuit board 10 is grounded. In this embodiment, the through hole 14 is circular. The through hole 14 may be quadrate or other shapes in other embodiments.

#The main body 12 includes a first surface 122 and a second surface 124 opposite to the first surface 122. A plurality of first tin pads 18 and a first copper layer 20 are formed on the first surface 122. The first tin pads 18 are substantially evenly arranged around the periphery of the through hole 14. The first tin pads 18 and the conductive vias 16 are positioned in an alternating manner on/in the periphery of the through hole 14.

#A tin layer 22 and a solder mask 24 are formed on the second surface 124 of the main body around the through hole 14. A first portion 24a of the solder mask 24 is formed between a periphery of the through hole 14 and the tin layer 22. The tin layer 22 includes four semicircular-shaped portions substantially evenly arranged around the through hole 14. A second portion 24b of the solder mask 24 is formed between adjacent fan-shaped portions. In one embodiment, a color of the solder mask 24 may be green which is beneficial to one's eyes. Depending on the embodiment, the color of the solder mask 24 may be yellow, white, black, or other colors.