Needs: gigabit ethernet with Poe (15W)
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Magnetic Saturation: The ferrite cores in the HX5004ENL are designed to handle tiny AC data signals. When you inject 350mA of DC power, the magnetic field becomes so strong that the core “saturates.” Once saturated, the transformer loses its inductance, and your Gigabit data link will either drop packets or fail to connect entirely.
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Thermal Stress: The internal copper wire used for the windings in the HX5004ENL is very thin to save space. High PoE current will cause these wires to overheat, potentially melting the insulation and causing a permanent short-circuit that could destroy your Ethernet PHY chip.
https://www.digikey.com/en/products/filter/pulse-transformers/166?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALAAxwDMdIAuoQA4AuUIAymwE4CWAOwDmIAL6FaYKohApIGHAWJlKAdjhwqtEJJi0KADkO6QhmGpiGKpgKw0ATA52FbtQ3DAxTFDVoemhvRq2qZqtnC2voHBVDaEvkFqLiC0%2BhSeMXAhAXoGcLlmsbZMrByQ3HxCohLgcB6y8op4hCSQ5DKMYt1AA
TG111-MSC13LFTR
749023113C
749022310
HX5008NL
SM42P01EL
S558-5500-JB
HXB5007HLT
https://www.tdk-electronics.tdk.com/en/374108/tech-library/articles/products-technologies/products-technologies/smd-pulse-transformers-for-gigabit-ethernet-and-poe/2182982#
that is also interesting. transformer per data lane.