Circuit board electrical connector

Claim 1

A circuit board electrical connector comprising: a housing with a front face having a receiving cavity for receiving a mating connector, said housing being attached to a circuit board such that an opening of said receiving cavity is flush with an edge of said circuit board; a protruded bottom section provided on a bottom of said housing and placed in a cutout section of said circuit board such that a front face of said protruded bottom section is substantially flush with said edge of said circuit board; a key groove provided on an upper face of said protruded bottom section and extending rearwardly from said front face of said protruded bottom section and communicating with said receiving cavity for receiving a key projection of said mating connector, thus minimizing the height of said connector and preventing plugging error of different connectors; and a metal shell attached to said housing such that it covers a top of a rear wall, sides of an intermediate plate, and sides and bottom edges of said protruded bottom section to define said cavity of said housing, wherein said metal shell has an attaching bottom section at a level substantially flush with the top face of said protruded bottom section and an L-shaped section which extends downwardly from said attaching bottom section and engages the entire length of said edge of said protruded bottom section, thus further reducing the height of said connector and reinforcing said protruded bottom section.