Electrical connector having terminal positioning structure

An electrical connector comprising:

• an insulative housing comprising a mating portion, a rear face opposite to the mating portion, a plurality of upper and lower terminal receiving passageways defined in the mating portion and extending along a first direction, and a plurality of ribs and recesses staggeredly arranged in the rear face, each rib extending along a second direction perpendicular to the first direction;
• and
• a plurality of first and second terminals respectively received in the upper and lower terminal receiving passageways and each comprising a contact portion received in the terminal receiving passageway, an engaging portion perpendicularly extending from said contact portion and extending out of the terminal receiving passageway, and a soldering portion connecting with the engaging portion, the engaging portions of the first terminals being received in said recesses and the engaging portions of the second terminals abutting against said ribs,
• wherein said insulative housing comprises a pair of sidewalls extending rearwardly and downwardly from said mating portion, and said sidewall has a slot in a lower portion thereof.