What is the rated current of these inductor?

[Eldi4]

Hello there, i was trying to figure out what is the rated current of these inductors, i don't find any accurate datasheet of these inductors, these inductors is found in printer's board, the value is 101,151,221 and 331.
picture attached, the other component is for size comparison
the inductors diameter is 8mm

[retrolefty]

Short of a manufacture's datasheet I would cap the current rating to the size of wire used in it's winding.

[Eldi4]

I don't really think that is a good way to determine the rated current, because i found some inductor that look like these,  and uses 2A rated wire but it was a 400mA 331 inductor, the precise method would be using an oscilloscope to see where the current started saturated,  but here i dont have an oscilloscope

[T3sl4co1l]

Probably in the range of 300mA to 2A.

If you want to take the time to measure, figure 40°C max temp rise; adjust current flow, then wait ten minutes and see if the temperature has stabilized to that level.  I would guess the corresponding heat dissipation is under a half a watt; in that case, you can also estimate from Imax = sqrt(0.5W / DCR), assuming you have an accurate way to measure low resistances.

Tim

[lordvader88]

They look to me like thy would be for smoothing the output of a SMPS, and typical rails in a printer, depending on the era, are 5, 12, 24V, with maybe 24V 1-2A for motor drives, maybe 0.5A-1A for the controls stuff. I'd also say most of them should be ok at a few 100mA. Just watch their temperature.