Receptacle connector assembly with keying devices

A receptacle connector assembly comprising:

• an insulative housing a plurality of terminals retained in the housing, the housing defining in a front mating face thereof a first large-dimensioned receiving cavity for receiving a first large-dimensioned plug connector and a second small-dimensioned receiving cavity for receiving a second small-dimensioned plug connector, the housing further defining first and second channels respectively communicating with the first and second receiving cavities for respectively receiving a projection portion of the first and second plug connectors, the housing having a partition wall and a sidewall beside the first receiving cavity, the housing defining first and second cutouts respectively in the sidewall and the partition wall communicating wit the first receiving cavity, and first and second recesses beside the channel and above the first receiving cavity;
• and
• a pair of keying devices comprising a pair of respective tail portions retained to rear portions of the housing, a pair of respective resilient portions extending from the corresponding tail portions to the first receiving cavity, a pair of respective engaging portions extending from the corresponding resilient portions to be located at a front portion of the first receiving cavity for being pushed away from each other by the first plug connector, and a pair of respective tongues extending laterally from the resilient portions to be received in the first and second recesses, the tongues projecting into the first channel for preventing the second plug connector from being inserted into the first receiving cavity;
• wherein the pair of engaging portions of the keying devices are spaced a distance smaller than the width of the first receiving cavity but larger than the width of the second receiving cavity.

A receptacle connector assembly comprising:

• a unitary insulative housing defining side by side a first receiving cavity for receiving a first plug and a second receiving cavity for receiving a second plug, said first receiving cavity being larger than the second receiving cavity while sharing a partition wall with the second receiving cavity therebetween;
• the housing further defining first and second channels respectively communicating with the first and second receiving cavities for respectively receiving a projection portion of the first and second plugs;
• and
• first and second keying devices attached to the housing and located at opposite sides of the first receiving cavity, each of said first and second keying device defining a tail portion fixedly retained to the housing, a resilient portion with an engaging portion extending into the first receiving cavity, and a tongue extending into the first channel intermediate said engaging portion and said tail portion;
• wherein the housing defines a first cutout in the sidewall to allow the first keying device to be assembled to the housing in a lateral/inward direction, and further defines a second cutout in and around the partition wall to allow the second keying device to be assembled to the housing in a back-to-front direction.

A receptacle connector assembly comprising:

• first and second receiving cavities, a width of said second receiving cavity being smaller than a width of said first receiving cavity;
• said first and second receiving cavities being separated by a partition;
• first and second keying devices, said keying devices each having a resilient portion, an engaging portion, a tail portion, and a tongue inwardly extending from said resilient portion intermediate said engaging portion and said tail portion;
• said first keying device being coupled to a sidewall of said first receiving cavity and said second keying device being coupled to said partition,
• said engaging portions of said first and second keying devices extending into said first receiving cavity and spaced apart at a distance smaller than said width of said first receiving cavity but larger than said width of said second receiving cavity and said tongues of said first and second keying devices spaced apart to prevent an incorrectly-sized plug connector from being inserted into said first receiving cavity.