Electrical connector having better electrical performance

1. An electrical connector, comprising: a base seat; a plurality of contacts fixed in the base seat; and a shielding shell surrounding the base seat and defining a body portion retained in the base seat, a rear wall attached a rear face of the base seat and a plurality of soldering portions extending outside of the body portion; wherein the electrical connector defines a mounting surface, a lower edge of the rear wall is higher than the mounting surface and defines at least one board-lock portion to improve the resonant frequency, wherein the rear wall defines five board-lock portions, wherein the body portion includes a top wall, a bottom wall and two opposite side walls connecting with the top wall and the bottom wall, the rear wall is bending from the top wall and each side wall defines a first soldering portion and a second soldering portion arranged in a front-to-rear direction, wherein the base seat defines a base portion and a mating portion, the body portion of the shielding shell defines a frame portion surrounding the mating portion of the base seat and a connecting portion fixed in the base portion, each side wall of the connecting portion defines at least one board-lock portion.

2. The electrical connector as described in claim 1 , wherein the second soldering portion is bending outwardly from the rear edge of the connecting portion to form a vertical structure, the board-lock portions of the rear wall and the seconding soldering portions are arranged in a row.

3. The electrical connector as described in claim 2 , wherein the first soldering portion is torn from the side wall of the frame portion and bending outwardly and horizontally to form a horizontal structure.

4. The electrical connector as described in claim 3 , wherein the lower edge of the rear wall is linear shape and a plurality of vertical pins extend downwardly to form the board-lock portions.

5. The electrical connector as described in claim 1 , wherein the electrical connector defines a protective layer attached the rear face of the base seat.

6. The electrical connector as described in claim 1 , wherein the connecting portion defines a pair of tabs locking the base portion inwardly.

7. An electrical connector assembly comprising: a printed circuit board defining a notch; an electrical connector forming a front mating port and a rear mounting port a long a front-to-back direction, and including an insulative housing with an upside-down L-shaped base seat in the rear mounting port and a mating tongue forwardly extending from the base seat in the mating port; a plurality of contacts disposed in the housing with front contacting sections exposed in the mating port and rear mounting sections in the mounting port; and a metallic shell enclosing the housing to form said mating port which is essentially located in the notch, said shell further including a pair of side walls and a rear wall cooperating with each other to shield a rear horizontal portion of the base seat and be mounted upon a top surface of said printed circuit board; wherein the base seat defined a mounting face intimately confronting downwardly the top surface of the printed circuit board, and all said pair side walls and said rear wall are equipped with mounting devices to mechanically and electrically connect to the printed circuit board, wherein said shell forms a pair of horizontally extending front soldering portions around the front mating port, and a pair of horizontally extending rear soldering portions around the rear mounting port, and said pair of rear soldering portions are located at two opposite rear corners between the rear wall and the corresponding side walls, respectively, wherein said mounting devices are essentially board-locks extending through the printed circuit board in a vertical direction perpendicular to said front-to-back direction.

8. The electrical connector assembly as claimed in claim 7 , wherein said pair of front soldering portions are configured with a surface mounting interface while the pair of rear soldering portions are configured with a through hole interface.

9. The electrical connector assembly as claimed in claim 7 , wherein the pair of rear soldering portions unitarily extend from the corresponding side walls, respectively.

10. The electrical connector assembly as claimed in claim 7 , wherein said connector is further equipped with a protective layer around a rear portion of the mating port.

11. The electrical connector assembly as claimed in claim 7 , wherein the soldering sections of the contacts are of a surface mounting type.

12. The electrical connector assembly as claimed in claim 7 , wherein each of the pair of side walls and the rear wall defines a bottom edge from which the mounting devices extend, and said bottom edge is higher than the mounting face.

13. The electrical connector assembly as claimed in claim 7 , wherein the mounting sections of said contacts are located in front of said rear wall in said front-to-back direction.

14. The electrical connector assembly as claimed in claim 7 , wherein said shell defines an upwardly slanting front opening to communicate the front mating port with an exterior forwardly in the front-to-back direction.

15. The electrical connector assembly as claimed in claim 7 , wherein a pair of mounting posts unitarily extend downwardly from the mounting face and through the printed circuit board.