Stacked electrical card connector having stand off

An electrical card connector assembly comprising:

• a first connector defining a pair of opposite first side arms extending along a front-to-back direction;
• a second connector stacked upon the first connector and defining a pair of opposite second side arms extending along the first-to-back direction;
• a first retention device being of a hook type and located on one of said first side arms;
• a second retention device being of the hook type and located on a corresponding one of said second side arms adjacent to said first retention device;
• a standoff functioning to fastening the first connector and the second connector together in a vertical direction perpendicular to said front-to-back direction, said standoff defining first and second openings corresponding to the first retention device and the second retention device, each of said first and second opening defining a large section and a small section communicating with each other in said front-to-back direction so as to allow the corresponding retention device to be initially received in the large section in a lateral direction perpendicular to both said front-to-back direction and said vertical direction, and successively located in the small section after the standoff and the corresponding retention device have a relative movement along said front-to-back direction, thus assuring the corresponding retention device is restrained with regard to the standoff in said lateral direction;
• said standoff further including an elastic piece, and one of the corresponding first side arm and second side arm defining a retention piece;
• wherein
• an engagement occurs between the retention piece and the elastic piece in said front-to-back direction;
• wherein
• said engagement prevents the retention device from moving from the small section back to the large section of the corresponding opening unless said elastic piece is forcibly deflected in the lateral direction by said retention piece.

An electrical connector assembly comprising:

• a connector defining at least one side arm extending along a front-to-back direction;
• a standoff defining a height larger than that of the connector in a vertical direction perpendicular to the front-to-back direction for fastening the connector to a printed circuit board on which the connector is mounted;
• a hook formed on one of the standoff and said side arm;
• an opening formed in the other of said standoff and said side arm, said opening defining a large section an a small section communicating with each other in said front-to-back direction so as to allow the hook to be initially received in the large section in a lateral direction perpendicular to both said front-to-back direction and said vertical direction, and successively located in the small section after the standoff and the hook have a relative movement along said front-to-back direction, thus assuring the hook is restrained with regard to the standoff in said lateral direction;
• an elastic piece defined on one of said standoff and said side arm;
• a retention piece defined on the other of said standoff and said side arm;
• wherein
• an engagement occurs between the retention piece and the elastic piece in said front-to-back direction;
• wherein
• said engagement prevents the hook from moving from the small section back to the large section of the opening unless said elastic piece is forcibly deflected in the lateral direction by said retention piece.