I am repairing an IP camera that has a blown transistor in the power supply section. The transistor looks like a SOT23 transistor, but it has 6 pins (how is that package called, anyway?), 4 of them connected together. I tried reading the marking, but the best I got was "HC??" or at least I think it's HC, could be HG, BC, BG, 8C, 8G or something like that.
It is a N channel MOSFET (judging by the fact that there is no resistor in series with the gate) with 4 pins connected to the drain (two middle and two end pins), like this (looking from the top):
G D D +--------+ | | +--------+ S D D
If nobody can identify it, perhaps you could help me choose another suitable transistor. It is used in the primary side of PoE power converter in the device, so the working voltage is 48V, but could be higher. I will try to measure the current trough it (I have connected a TO220 transistor now to find what is causing too much current to be used and burning the small transistor).
EDIT: I managed to read the marking - it's FHC83 or EHC83. Still can't find anything in any marking database.
Also, I identified the driver chip - it's CD40106 - a few of its gates are connected in parallel.
There is also another transistor in there - looks like it's connected in series with the power input, the marking is "61" which makes it "FMMT618", but that is only 20V and would be connected backwards - current going into the emitter and out of collector (for a NPN transistor).