Card edge connector with durable key

1. A card edge connector adapted for a daughter card with at least one notch, comprising:

a housing made from insulating material and comprising a slot for receiving the daughter card along its length direction and contact-receiving channels communicating with the slot;

a plurality of conductive contacts received in the channels, each comprising a contacting section extending into the slot for contacting with the daughter card and a leg extending out of the housing;

at least one key for matching with the at least one notch of the daughter card, transversely retained in the slot; and

at least one position member preventing the key from falling off the slot wherein a retaining opening is defined opened along a card-inserting direction and a cavity communicating with the retaining opening and through a sidewall adjacent the slot, said key is inserted into the retaining opening along the card-inserting direction and the position member is filled with the cavity from the sidewall; wherein the key comprises a recess on one edge thereof and a top end of the position member is blocked in the recess to prevent said key from falling off along the card-inserting direction.

2. The card edge connector according to claim 1 , wherein said key is made from metal material.

3. The card edge connector according to claim 1 , wherein the position member is of a board shape with which the recess and the cavity are filled.

4. The card edge connector according to claim 1 , wherein the housing defines a pair of guiding arms perpendicularly extending from two opposite ends thereof, and each guiding arm defines a guiding groove with a same plane of the slot.

5. The card edge connector according to claim 1 , wherein the position member is formed by mass of material filled into the cavity.

6. The card edge connector according to claim 5 , further comprising first-metal ears retained in the guiding arms and second-metal ears retained in sidewalls opposite to the slot, the first and second metal ear both comprising soldering portions parallel to the bottom of the housing.

7. The card edge connector according to claim 6 , wherein the position member is filled with a recess defined on one edge of the key and a cavity defined the housing.

8. An electrical connector comprising:

an insulating housing defining a elongated slot extending longitudinally along a first direction while communicating with an exterior in a second direction perpendicular to the first direction;

at least one row of contacts disposed in the housing and beside said slot;

at least one key inserted into the slot in the second direction;

at least one position member encountering the at least one key in a third direction to prevent the at least one key from falling off in the second direction wherein said key and position member decussate when assembled.

9. The card edge connector according to claim 8 , wherein the housing defines a pair of guiding arms at two opposite ends thereof with a guiding groove communicating with and at a same plane with the slot.

10. The card edge connector according to claim 8 , wherein the at least one key is metallic block.

11. A card edge connector assembly comprising:

an insulative housing defining a central slot extending along a longitudinal direction of the housing;

a key receiving cavity and a positioning member receiving cavity defined in the housing and communicating with each other;

a key inserted into the key receiving cavity from an exterior in a first direction and transversely interrupting the central slot;

a positioning member inserted into the positioning member receiving cavity from the exterior in a second direction, and locking the key in position; wherein the first direction is different from the second direction.

12. The assembly as claimed in claim 11 , wherein the first direction is perpendicular to the second direction.

13. The assembly as claimed in claim 12 , wherein both said first direction and said second direction are perpendicular to said longitudinal direction.

14. The assembly as claimed in claim 12 , wherein said key is exposed to the exterior while the positioning member is hidden from the exterior once the connector is mounted to a printed circuit board.