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 PhotonMay 23, 2019 at 3:14
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13\$\begingroup\$ @ThePhoton Isn't F more common for fuses, with ferrite beads marked FB? \$\endgroup\$– HearthMay 23, 2019 at 3:45
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1\$\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\$– heketeMay 24, 2019 at 5:10
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\$\begingroup\$ This is a duplicate question . Search next time \$\endgroup\$– Tony Stewart EE75May 25, 2019 at 0:55
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7 Answers
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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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6\$\begingroup\$ The D7 is not the reference designator, it's the actual part marking. The reference designator is F2. \$\endgroup\$ May 24, 2019 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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D7 with mark F2, It's a Fast tripping resettable circuit protection.
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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\$– SaimochMay 24, 2019 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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2\$\begingroup\$ The D7 is not the reference designator, it's the actual part marking. The reference designator is F2. \$\endgroup\$ May 24, 2019 at 13:05
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It's a fuse for sure. We always designate ferrite beads with FB.
