It looks like a ceramic cap, 8mm diameter, with leads that lay across opposite faces and cross at the center. I suspect it's a polyfuse or similar.
Markings: B R075
4053S
ID component
Jul 09, 2016
11 Replies
4053S
Forgot to mention resistance is 0.4 ohms.
Probably a PTC, can you put 0.080 amps thru it and see what happens?
Might be similar to a REUF075
Cheers
Likely a Bourns polyfuse, MF-R075, 60 volts, 0.75 amps.
John Larkin Highland Technology, Inc
lunatic fringe electronics
Ok, I didn't know how much current to try but I'll try that.
Good lead, John.
If he zeroed the ohms before measuring, though, the .4 ohms (max) is hard to reconcile for the 075 at 23K although possible.
However, the diameter he measured does not correlate to the 075 but does correlate to the 050.
It seems to be R050 in size and resistance, but then the marking does not correlate. This is a bit of a puzzle.
Sorry, I meant 23C.
Maybe it's a counterfeit.
John Larkin Highland Technology, Inc
lunatic fringe electronics
Good point. Measurements are needed.
At that current, the power would only be about 2.56mW based on his information. That doesn't seem like enough to me.
Tom, do you have a lab power supply? That is, do you have knobs to adjust both current and voltage?
Only voltage, but with a resistance of 0.4 ohms I don't think it takes much voltage across it, so a simple test with a resistor (a few of them) and a variable voltage should do it.
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