Electrical connector assembly having improved locking portions

A board connector adapted for mating with a cable connector, comprising:

• a first seat comprising a base, two opposite first sidewalls arranged along a first direction, and a second sidewall connecting with the base and the first sidewalls at top faces thereof;
• and
• a plurality of first terminals retained in the base and comprising contacting portions projecting from a front face of the base and arranged along the first direction between the two first sidewalls;
• wherein the second sidewall defines a first locking section for engaging with a corresponding second locking section defined on the cable connector.

A cable connector comprising:

• a second seat defining a front face, two small faces and two larger faces perpendicular to each other, a plurality of passageways opening through the front face and one of the large faces;
• and
• a plurality of second terminals received in the passageways;
• wherein each of the small faces defined a first locking portion and another of the large faces defines a second locking section.