source: EDN article
Susan Nordyk -October 17, 2015
Surface-mount XF2-5GPOLx series transformer modules from XFMRS furnish 1500-V RMS isolation for 2.5GBASE-T Ethernet applications using Cat 5e cable infrastructure. The compact devices have a 1:1 turns ratio and provide open-circuit inductance of 350 µH minimum with a bias current of 8 mA (100 kHz, 0.1 V).
The XF2-5GPOLA is rated for 720 mA, while the XF2-5POLB is rated for 1 A. Both transformers operate over a temperature range of 0°C to 70°C. A third device, the XF2-5GPOLC, is rated for 1 A and operates over a temperature range of -40°C to +85°C. Secondary DC resistance is 1.40 Ω maximum.
All of the PoE-capable transformer modules carry a UL94V-0 flammability rating and come taped and reeled (250 pieces per 13-in. reel).