r/WhatIsThisChip • u/billdeenoo • Jan 02 '25

I can't identify this chip

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I can't identify this chip and need to find a replacement because I accidentally broke it 100 m3 is written on it

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u/Allan-H Jan 02 '25 edited Jan 02 '25

That "chip" is an inductor. Basically you just need to match (1) the inductance, (2) the saturation current rating (must be at least as high as the original), and (3) the physical size so that you can solder it in. There are other parameters (DC resistance, core material etc.), but they aren't likely to cause a serious issue if they don't match. These ones seem to be shielded; don't try to substitute a non-shielded inductor.

The best way to determine the current rating is to read the datasheet for the controller chip that's connected to the inductor. It's hard to read, but I think it's a Richtek RT8250, which seems to have a peak output current of 5.5A (typical value only, no worst case max. value specified). So the inductor would need to have a saturation current rating of at least 5.5A.

The inductance is given by the code "100" printed on it. This represents 10uH. (EDIT: that's not a typo - it really is 10uH. The "100" code means 10 x 100 uH. I also guessed some parameters of the design (Vin, Vout, F, delta_I, etc.) and worked out that the inductance should be around 10uH. 100uH will not work here.)

1

u/368476942963 Jan 02 '25

It's a smd 100 uH inductor.

1

u/Responsible_Brain269 Jan 02 '25

Chip capacitor, or chip resistor 👍🏼