Hello,
I'm posting this here because I didn't see an "(Help) Identify(ing) Components"/ "Components (Information)" etc. Thread.
I'm repairing a brushless DC motor board, nothing critical just a simple power board. One high side Mosfet and one low side Mosfet were found short (cross phases), and I didn't have continuity through the positive supply. Found two components that were not conducting. Their appearance was similar to capacitors, however they contained some writing, and they were online with the primary power bus. So I determined they were fuses, initially thinking they contained the letter S, I convinced myself it must be a 5, and that they were 5A fuses.
I ordered replacement parts, and when they arrived I discovered I made an error ordering imperial sizes instead of metric, and these are FAR too small (costly too... so that's gravely disappointing!). I went back to research more about SMD fuses and now reconsidering that these are in fact letter "S"s. However there is no standard, and brands use various symbols for their ratings. I thought a quick check on the Mosfets datasheet would help me sort safe currents, however the Mosfet are NTMFS4C302N, and rated for 230A, there is absolutely no way this circuit is rated anywhere near that threshold.
So if I could get any assistance on tracking down these parts I would be grateful.
dimensions measured roughly with a caliper:
0.12..." (3mm)
0.06..." (1.5mm)
Please see attached image.
Thank you for your time.
I'm posting this here because I didn't see an "(Help) Identify(ing) Components"/ "Components (Information)" etc. Thread.
I'm repairing a brushless DC motor board, nothing critical just a simple power board. One high side Mosfet and one low side Mosfet were found short (cross phases), and I didn't have continuity through the positive supply. Found two components that were not conducting. Their appearance was similar to capacitors, however they contained some writing, and they were online with the primary power bus. So I determined they were fuses, initially thinking they contained the letter S, I convinced myself it must be a 5, and that they were 5A fuses.
I ordered replacement parts, and when they arrived I discovered I made an error ordering imperial sizes instead of metric, and these are FAR too small (costly too... so that's gravely disappointing!). I went back to research more about SMD fuses and now reconsidering that these are in fact letter "S"s. However there is no standard, and brands use various symbols for their ratings. I thought a quick check on the Mosfets datasheet would help me sort safe currents, however the Mosfet are NTMFS4C302N, and rated for 230A, there is absolutely no way this circuit is rated anywhere near that threshold.
So if I could get any assistance on tracking down these parts I would be grateful.
dimensions measured roughly with a caliper:
0.12..." (3mm)
0.06..." (1.5mm)
Please see attached image.
Thank you for your time.
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