RJ45 Jack, 8p8c, Cat3 — Through-Hole Bottom-Entry
It carries a Cat3 rating, meaning it is suited for 10BASE-T Ethernet and voice applications up to 16 MHz — not for modern gigabit or PoE runs. The single-row, single-port design uses gold-plated phosphor bronze contacts with a 49.3µin (1.25µm) thickness, which gives it decent mating-cycle durability for a legacy part. The housing is glass-filled nylon (PA), and the connector includes panel stops for alignment during installation.
Lifecycle Status — Obsolete
The 188728-1 is officially listed as Obsolete.
This jack mounts through-hole from the bottom of the PCB — the connector body sits on the solder side, and the mating face is accessible from the top. The vertical orientation means the cable plugs in perpendicular to the board. Solder termination is standard for the eight contacts. Panel stops on the housing help locate the part during assembly, but there are no board locks or additional retention features — the solder joints carry all the mechanical load, so the board should be well-supported in the panel cutout.