Electrical connector haing high density contacts for miniaturization

An interconnection system with a positioning spacer comprising:

• an insulative housing comprising a base portion and an engaging portion extending from the base portion along a first direction;
• a plurality of first contact units and a plurality of second contact units alternately arranged in a predetermine interval along a second direction perpendicular to the first direction, each of said contact units comprising a pair of contacts, and each contact comprising a soldering portion;
• the positioning spacer assembled with the base portion of the insulative housing and pressed against the first contact units and second contact units;
• a first distance between of two soldering portions of each first contact unit is smaller than a second distance between of two soldering portions of each second contact unit in the first direction.

An interconnection system comprising:

• an insulative hosing defining thereof a rear portion and a front portion along a first direction;
• a plurality of first contacts disposed in the housing, each of said first contacts defining a mating portion extending into the front portion of the housing and a soldering portion extending out of the rear portion of the housing under condition that the mating sections are arranged in one row while the soldering portions are arranged alternately in two rows;
• and
• a spacer assembled unto the rear portion of the housing and including a plurality of first wedged positioning sections located on a front side thereof along a second direction perpendicular to said first direction;
• wherein
• said first wedges positioning sections commonly define a series of peak-valley structures along the second direction with equal intervals thereof so as to confront the alternately arranged soldering portions with a first pitch thereof in said second direction, while the mating portions are arranged with a plurality of groups and each group defines a second pitch smaller than the first pitch in said second direction.