16. PTC Resettable Fuse for PoE Ethernet Port Protection
Vikas is designing a PoE (Power over Ethernet) powered device that receives power through the Ethernet cable.
The PoE supply voltage can range up to 57V, and the device normally draws 350mA.
To protect the board from overcurrent due to a fault on the PoE input, he needs an SMD PTC resettable fuse on the PoE input power line.
The fuse must hold above normal operating current with margin for thermal derating, and the voltage rating must exceed the maximum PoE voltage.
He wants a 1812 SMD package to handle the higher voltage.
The company's AVL specifies Littelfuse, so the part must be selected from Littelfuse on DigiKey.
Help him select a suitable PTC resettable fuse from Littelfuse on DigiKey.
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