TE 5555799-1 — Cat3 RJ45 Jack with Board Lock for Vertical PCB Mount
It sits in the 5555799 base-series family of through-hole jacks, distinguished by its board-lock feature and keyed housing that prevents reversed plug insertion. The 50.0µin (1.27µm) gold plating on the phosphor bronze contacts supports repeated mating cycles typical of field-service Ethernet ports, while the Cat3 rating limits the signal path to 10/100BASE-T applications — not rated for Cat5e or Cat6 gigabit data rates.
Board Lock and Keyed Housing — Retention and Mis-Mate Protection
The keyed housing ensures the plug cannot be inserted upside down, which saves a rework step on the assembly line. The user-selectable tab direction gives flexibility in cable exit orientation relative to the board edge.
Cat3 Rating — Know the Data-Rate Limit
The Cat3 rating on this jack means it is specified for voice and 10BASE-T / 100BASE-T4 Ethernet signaling — not for 1000BASE-T or higher. For legacy 10/100 equipment or industrial fieldbus networks running at those speeds, the Cat3 rating is adequate and the 50 µ" gold contacts maintain signal integrity across the rated temperature range.