Stacked connector assembly

A stacked connector assembly comprising:

• lower connector defining a lower insulative housing with a plurality of first contacts therein;
• an upper connector defining an upper insulative housing with a plurality of second contacts therein;
• hinged latching structures formed on a front bottom portion of the upper housing and a top portion of the lower housing;
• and
• a locking mechanism formed around rear portions of said upper and lower housing;
• wherein
• when the upper connector with the first contacts exposed on the rear portion thereof is assembled to the lower connector with the second contacts exposed on the rear portion thereof, the upper housing is pivotally assembled to the lower housing about said hinged latching structure in front-to-back and up-to-down directions, and the locking mechanism operates when said upper housing is rotated to a horizontal position in abutment with said lower housing so as to prevent said upper housing from reversed rotation;
• and wherein the lower housing has opposite ends from which two first arms respectively extend in a rearward direction, each first arm having a remote end face defining a notch and wherein the upper housing has opposite ends from which two second arms respectively extend in a rearward direction, a latch depending from each second arm and forming a catch engaging the notch to securely fix the upper housing to the lower housing.