Can anyone please help me identify this component. It's marked R40 515 Z5J Dimensions are roughly 6.5mm x 6.5mm x 3.0mm my verniers have disappeared but it's pretty close.

  • 2
    \$\begingroup\$ Asking for help identifying a part is on topic. Asking where to buy one will get your question closed. You can edit the question and remove the part about a link to where to buy a replacement. \$\endgroup\$
    – JRE
    Commented Jun 5, 2018 at 18:56
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    \$\begingroup\$ +1 for a very good picture \$\endgroup\$
    – jsotola
    Commented Jun 5, 2018 at 18:59
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    \$\begingroup\$ Looks like 0.4µH coil. \$\endgroup\$ Commented Jun 5, 2018 at 19:04
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    \$\begingroup\$ Component ID questions are not off topic! \$\endgroup\$
    – Voltage Spike
    Commented Jun 6, 2018 at 6:11
  • \$\begingroup\$ You could further improve your question by adding exact dimensions, if you own a good caliper. \$\endgroup\$
    – Ariser
    Commented Jun 7, 2018 at 11:05

1 Answer 1


If the dimension 10.2x10.2x4.7mm lines up with your component then it may be Ferrocore HCI1050-R40 which is a 0.4uH inductor. There are others in the same series with the same inductance and different size. HCI####-R40.

  • \$\begingroup\$ 6.5mm x 6.5mm x 3.0mm all very rough as can't find my verniers, very appreciated though, please if anyone else can identify it I would be most grateful. \$\endgroup\$
    – th3joker
    Commented Jun 8, 2018 at 21:35

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