TE Connectivity 520426-4 is a 1-port modular jack with 8p8c (RJ45) configuration, through hole mounting, right angle orientation, unshielded, with board lock feature.
TE Connectivity 520251-4 is a through-hole, right-angle modular jack with 8p8c (RJ45) configuration, unshielded, Cat3 rated, with gold-plated phosphor bronze contacts.
TE Connectivity 555164-1 modular jack with 8P8C (RJ45) configuration, through hole mounting, and right angle orientation. Unshielded with solder termination.