An electrical connector includes an insulative housing defining a plurality of passageways and a plurality of contacts disposed in the passageways by two arrangement manners. Each contact includes a mating portion located at an upper end and a soldering portion located at a bottom end. Wherein a first arrangement manner is that neighboring mating portions defined a distance in a same row is smaller than a distance defined by corresponding neighboring soldering portions, and neighboring mating portions defined a distance in a same column is equal to a distance defined by corresponding neighboring soldering portions. A second arrangement manner is that neighboring mating portions defined a distance in both a same row and a same column is smaller than a distance defined by corresponding neighboring soldering portions.