Electrical connector assembly

An electrical connector system comprising:

• a first plug having a mating interface;
• a receptacle having an opening configured to receive the mating interface of the first plug housing;
• a second plug having a mating interface sized to mate with the receptacle opening;
• a third plug having a mating interface which is smaller than the receptacle opening and therefore normally insertable into the receptacle opening;
• first and second plug keying features formed on the mating interface of the first plug;
• and
• first and second keying receptacle features formed within receptacle opening for mating with the first and second keying of the first plug, respectively, the first receptacle keying feature being configured to prevent the mating interface of the second plug from being fully inserted into the receptacle opening, and the second receptacle keying feature being configured to prevent the mating interface of the third plug from being fully inserted into the receptacle opening.

A reduced envelope electrical connector housing assembly comprising:

• a first plug including a housing having a front and rear ends, the front end including a top wall, a bottom wall, and first and second side walls, at least a portion of the top, bottom, and side walls defining a mating interface;
• a receptacle having an opening configured to receive the mating interface of the plug housing;
• a second plug having a mating interface sized to mate with the receptacle opening;
• a third plug having a mating interface which is smaller than the receptacle opening and therefore normally insertable into the receptacle opening;
• a deflectable latch formed along the first side wall of the first plug housing;
• at least one latch mating element formed within the opening in the receptacle, the latch mating element being positioned to securely engage the latch when the first plug and the receptacle are fully mated with one another;
• a first plug keying feature formed on the second side wall of the first plug housing;
• a first receptacle keying feature formed within the receptacle opening for mating with the first plug keying feature when the mating interface of the first plug housing is inserted into the receptacle opening;
• a second plug keying feature formed on one of the top and bottom walls of the first plug housing;
• a second receptacle keying feature formed within the receptacle opening for mating with the second plug keying feature when the mating interface of the first plug is inserted into the receptacle opening;
• and
• wherein one of the first and second receptacle keying features is configured to prevent the mating interface of the second plug from being fully inserted into the receptacle opening, and the other of the first and second receptacle keying features is configured to prevent the mating interface of the third plug from being fully inserted into the receptacle opening.