Electronics > Repair

Cracked SMD inductor damage assessment

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unturned3:
I recently purchased a Wifi module and I noticed a cracked SMD inductor on the back. The seller assured me that this is a common surface crack, and it would be fine since the inductor's ferromagnetic core is not damaged. However, that sounds somewhat dodgy to me... not sure what do you all think?

wraper:
It IS a ferrite core that is cracked. It's parameters should have changed a bit but inductor should still be functional.

Kleinstein:
It is not just cracks but some small parts missing. This would reduce the inductance somewhat, but not very much (e.g. < 10% range). So Chances are very high it is still functional with no real negative effect.

thinkfat:

--- Quote from: Kleinstein on September 30, 2022, 08:34:02 am ---It is not just cracks but some small parts missing. This would reduce the inductance somewhat, but not very much (e.g. < 10% range). So Chances are very high it is still functional with no real negative effect.

--- End quote ---

Unless of course the stem of the core is also cracked, but that's not visible from up top. You could try wiggling the inductor, see if it budges.

coppercone2:
if the top is just chipped off in the corner it should be OK unless the circuit was way too optimized or barely functioning. The inductor tollerance is wide usually, so you have a few % change.. but chances are its in spec, since it might be +-30% part.

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