Connector assembly having front and rear rows of terminals with differently leveled contacting portions

A connector assembly comprising a receptacle connector and a plug connector for mating with the receptacle connector,

• the plug connector comprising:
• a paddle board having a bottom side;
• and
• a row of first conductive pads and a row of second conductive pads being exposed at the bottom side of the printed circuit board, the first conductive pads being disposed in front of the second conductive pads along an insertion direction of mating,
• wherein the second pad is thicker than the first pad;
• and
• the receptacle connector comprising:
• a housing defining an inserting slot for insertion of the plug connector;
• a row of first terminals each having a first contact portion extending upwardly into the inserting slot for mating with a corresponding first pad of the paddle board;
• and
• a row of second terminals each having a second contact portion extending upwardly into the inserting slot for mating with a corresponding second pad of the paddle board,
• wherein the second contact portion extends along a direction perpendicular to the insertion direction into the inserting slot up to a level lower than a level that the first contact portion extends along the same direction into the inserting slot.