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Wild guess, but B6 may be a vendor designation. Seems similar to a BAT54C common Cathode Schottky Barrier diode. The CC3 may be a date code, but the "C" may imply the common cathode. Again, just guessing....
If you have a device on the same board that is the same, and not damaged, see if you can check the diode function(s) of a good chip
Thanks sagor1. It is an active device, not just a diode.
Checking on other boards, the device doesn't measure as a normal transistor ... I'll have to remove one to get a better idea.
As mentioned above, a pair of them are used to drive a small transformer, to provide 5 volts to feed a a 3.3 volt regulator. Just a small section of circuit to provide an isolated supply for the comms section.