I'm trying to figure out how a PCB works (that I took out of something). I'm going through and looking at the different components, and I've identified a handful of parts, but I'm totally stuck on this one. It is near a few capacitors, but it has no uF written on the side, and the packaging doesn't look like a capacitor, although the general shape is the same, so I don't think it is a capacitor, though it could be. The outside has a rubbery texture to it.
In the photo above, it says "E487" (the seven is on the corner – I'm pretty sure it is a seven, but perhaps not)
The underside of the PCB. I've outlined in red where I think the component is connected (not totally sure, though)
Sadly, searching for "e487 datasheet" didn't yield anything helpful. What is this strange component?
Best Answer
It's an unshielded (drum type) inductor with shrink-wrap tubing around it to protect the winding.
Hence the designator "L2". Part of a switching regulator.
Edit:
The PN8016 switching regulator chip here is a non-isolated DC-DC converter, so the output is not galvanically isolated from the mains. It is potentially lethal if you come into contact with the low voltage output or "GND" (or pretty much any other part of the circuit).
In this case, the DC input is several hundred volts.