Board-Mount Ethernet Jack with Integrated Shielding
It sits in the 406541 base series, carrying one port with a single row of contacts. The connector is rated Cat5, which means it is qualified for 100 MHz baseband Ethernet applications — Fast Ethernet and 100BASE-TX, not Gigabit. The shielded shell includes an EMI finger — a spring contact that grounds the jack to the panel cutout before the signal pins mate. This reduces radiated emissions and improves immunity in electrically noisy environments like industrial controllers, PoE switches, and test equipment enclosures. The thermoplastic housing carries no LED indicator — this is a plain jack for applications where link-status lights are handled elsewhere on the board.
The Cat5 rating limits this jack to 100 MHz signal bandwidth. That supports 10BASE-T and 100BASE-TX Ethernet at distances up to 100 meters. It is not qualified for Cat5e (100 MHz with tighter crosstalk margins) or Cat6 (250 MHz) — if your BOM calls for Gigabit Ethernet over copper, you need a Cat5e or higher rated jack. The pinout is the standard T568A/B wiring for 8P8C; the 1-406541-1 does not include a magnetics module, so an external transformer is required for line isolation.
Through-hole solder termination provides mechanical strength for repeated cable insertion and removal. The shielded shell and EMI finger require a grounded panel cutout to function — the connector alone does not provide a chassis ground path unless the PCB ground plane connects to the shield pins. Verify the footprint includes the shield anchor pads.