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Hi again, googling (SMD code/top marking) Wf and WF SOT363 mainly came up with TVS or MOSFET. Doesn't seem to be a Fairchild device after a quick search of their SOT363 products, but I might have missed something.
The links are to datasheets for "WF" TVSs, the Alibaba one to a P-channel MOSFET: