The S558-5999-U7-F is a single-port 10/100 Base-T magnetics module intended for Ethernet applications. It features a 1CT:1CT turns ratio on both transmit and receive channels and maintains a minimum Open Circuit Inductance (OCL) of 350μH with an 8mA DC bias. The module ensures excellent signal performance with a maximum insertion loss of 1.0dB from 300kHz to 80MHz and a minimum return loss of 18dB up to 30MHz. With a HIPOT isolation rating of 1500 Vrms and a wide operating temperature range of -40°C to +85°C, it is built for reliability in various environments. This RoHS-compliant component is ideal for network interface cards, switches, and other systems requiring robust Ethernet connectivity.