This is a 50-position D-Sub receptacle (female sockets) from TE Connectivity. It features 3 rows, through hole mounting, solder termination, and gold flash contacts.
DDMS50S300 is a D-Sub receptacle with 50 female sockets, vertical orientation, through-hole solder termination, and gold contact finish. It features a steel shell with yellow cadmium plating and UL94 V-0 rated insulation.