Flyback transformer meets IEEE 802.3at-2009 standards

COILCRAFT POE300F Series flyback transformers meet IEEE 802.3at-2009 standards for PoE Plus applications up to 30 Watts. Devices operate at 250kHz with 36 to 72 Volts input. Units provide 1500 Vrms primary-to-secondary isolation; 500 Vrms primary-to-auxiliary and deliver RoHS compliant tin-silver over tin over nickel over phos bronze terminations and offer a maximum reflow temperature of 260C.

http://www.coilcraft.com/poe300.cfm