The 75869-304LF: That pitch sets the PCB footprint and the per-contact current ceiling — at typical signal levels the temperature rise stays well within the UL94 V-0 housing limit.
The mating contact finish is gold GXT™ at 15.0 µinch (0.38µm) over phosphor bronze base.
Shrouded 4-wall with keying slot — mis-mate protection
The keying slot prevents mismating with unkeyed or wrong-position counterparts.
