Electrical connector and printed circuit board with electrical connectors

A Printed Circuit Board (PCB) comprising:

• a board having holes for receiving at least two electrical connectors including a first electrical connector and a second electrical connector, each of the electrical connectors comprising:
• a terminal housing having a front wall and an opposing back wall, wherein an opening is provided in the front wall to receive a plug inside the terminal housing, the terminal housing also having opposing side walls, a top wall and an opposing bottom wall, wherein the bottom wall has an inner surface facing an inside of the terminal housing and an outer surface facing away from the inside of the terminal housing, the outer surface being provided with at least two retention pins projecting from the outer surface to be insertable into corresponding holes in the substrate;
• the at least two retention pins comprising a first retention pin and a second retention pin, the first retention pin positioned on the outer surface so as to be arranged asymmetrically with respect to the second retention pin;
• and
• wherein the first electrical connector is arranged on an upper side of the PCB and the second electrical connector is arranged on an opposing lower side of the PCB at a corresponding location of the first electrical connector.