The invention relates to a data transmission electric wire comprising a plurality of conductor strands covered in at least one insulating covering including PTFE, the plurality of strands comprising an inner core of first strands covered by at least one outer layer of second strands, said first and second strands being constituted of different metals, the metal of said second conductor strands presenting hardness that is lower than that of the metal of said first conductors, and said first strands being constituted essentially by an alloy of copper and said second strands being constituted essentially of copper. According to the invention, said alloy is a homogeneous copper alloy in the alpha phase that is stable at a temperature less than or equal to 500° C.