Modular Jack for Panel-Mount Ethernet
It is an unshielded, single-row, 3-port connector designed for PCB mounting in networking equipment, industrial controls, and building automation panels where a standard Ethernet interface is needed without the added cost of a shielded shell. The housing is polyamide (nylon) with a board guide feature to align the jack during soldering, and the tab faces down when mounted.
Solder termination, through-hole mounting, right-angle orientation — the 5557561-1 sits flush against the PCB edge with the RJ45 port opening parallel to the board. The board guide helps locate the part during wave or hand soldering, and the down-facing tab orientation is standard for most Ethernet patch cables. The three ports are ganged in a single housing, so one component populates three Ethernet connections on the same footprint. Each port accepts a standard 8p8c (RJ45) plug. The unshielded design means no metal shell to ground — keep this in mind if the application runs near high-frequency noise sources.