The PT61020EL is a 0.3 to Balun Transformer, 100MHz frequency with tin termination, SMD mounting and -1.1dB insertion loss. This transformer features low profile surface mount designed for reflow process (245° peak), supports 4- pairs of category-5 UTP cables, designed for long haul Gigabit Ethernet 10/100/1000 Base-T full duplex. Compliant with IEEE802.3ab Draft Standards for 1000 Base-T. Suitable for LAN and Ethernet applications.