Macronix International Co., Ltd.

Pei-Chi Hu

Jui-Chung Lee

Chi-Wen Lin

A circuit board includes a substrate, a plurality of contacts disposed on a surface of the substrate, and a solder mask. The contacts have a plurality of plating regions and a metal layer on the plating regions, and the plating regions have at least two different sizes. The solder mask covers the surface of the substrate and covers edges of the plating regions, in which topmost surfaces of the contacts are below a top surface of the solder mask, and a gap between the topmost surfaces of the contacts and the top surface of the solder mask is larger than 0 &#x3bc;m and is smaller than 5 &#x3bc;m.

Circuit board

A method of fabricating a circuit board includes forming a conductive layer on a surface of a substrate, and patterning the conductive layer to define a plurality of plating regions and a plurality of plating lines. The plating regions have at least two different sizes, a first group of the plating regions are interconnected by a first plating line of the plating lines, and a second group of the plating regions are interconnected by a second plating line of the plating lines. A ratio of a total area of the first group of the plating regions to a total area of the second group of the plating regions is from about 1 to about 5. A solder mask is formed on the surface of the substrate to cover the plating lines and partially expose the plating regions. At least one metal layer is electroplated on the exposed plating regions.

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Zhubei, Taiwan

Pei-Chi Hu