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What is this SMD component?

I'm trying to identify the SMD component (marked as D7 with an underline) on a circuit board of an ARGB LED controller. I think it is a diode or resistor, but I'm not sure about it. Please can I get some help with identifying it?

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  • \$\begingroup\$ It looks like it has a designator, "F2", which would make it most likely a ferrite bead. \$\endgroup\$ – The Photon May 23 '19 at 3:14
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    \$\begingroup\$ @ThePhoton Isn't F more common for fuses, with ferrite beads marked FB? \$\endgroup\$ – Hearth May 23 '19 at 3:45
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    \$\begingroup\$ The D7 just the manufactures code on the component. It doesn't mean anything unless you know who made it and what it is and then look up what the marking codes mean. It's component F2 on the PCB. Which probably means it is a fuse, or at least a component that is being used in the role of a fuse. \$\endgroup\$ – hekete May 24 '19 at 5:10
  • \$\begingroup\$ This is a duplicate question . Search next time \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 25 '19 at 0:55
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A resistance check could determine if it's a diode. It should exhibit a different resistance in each direction. A fuse would provide a short in both directions. "D" is very commonly used as a reference designator for diodes, but that is NOT a hard and fast rule.

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    \$\begingroup\$ The D7 is not the reference designator, it's the actual part marking. The reference designator is F2. \$\endgroup\$ – Dave Tweed May 24 '19 at 13:04
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That looks like an LP-USML400 resettable "polyfuse" made by Way-On.
Datasheet here

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enter image description here D7 with mark F2, It's a Fast tripping resettable circuit protection.

http://way-on.cn/products/detail.aspx?id=597

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The F2 next to it designates this as a fuse.... F1 is green

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Looks like it could be a fuse. Looks identical to the one to the 12V pin from this.

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  • \$\begingroup\$ yeah it the same one since it's from the same brand "cooler master" so it i guess it is a fuse, thanks for you answer @NeptBlu7 \$\endgroup\$ – Saimoch May 24 '19 at 1:20
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D is used for diode in most cases by various techies. however not sure about under line representation,

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    \$\begingroup\$ The D7 is not the reference designator, it's the actual part marking. The reference designator is F2. \$\endgroup\$ – Dave Tweed May 24 '19 at 13:05
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It's a fuse for sure. We always designate ferrite beads with FB.

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