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Usually I have seen pads beneath inductors. What is the purpose of this flange on an inductor? Why is it constructed like that?

enter image description here

Context: I am looking for low profile inductors (<1.2mm) and could not find any regular shaped (square/ rectangle) inductors meeting the specificaton (1uH, 8A- Isat.)

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  • \$\begingroup\$ Could be for solder inspection. The Vishay IHLP1616AB almost meets that at 7A. \$\endgroup\$
    – DKNguyen
    Commented Aug 17, 2021 at 4:34

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This is a high power inductor.

It looks like where the joint is made between the contacts and the flat wire winding. The ball schematically represents a weld, real ones would like a bit different (and a bit messier).

enter image description here

Nothing you should have to worry about much footprint-wise, just follow the datasheet recommendations.

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  • \$\begingroup\$ Am I the only one who finds this a bit weird? Why would a manufacturer need a joint for a flat inductor while they are capable of pulling (or bending?) the ends to the sides? No offense. I'm not telling you anything about your answer. Just the production technique seems a bit weird to me. \$\endgroup\$
    – Rohat Kılıç
    Commented Aug 17, 2021 at 4:55
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    \$\begingroup\$ @RohatKılıç The wire inside, if flat, isn't in the same plane as the feet anyways so that's a nightmare bend. \$\endgroup\$
    – DKNguyen
    Commented Aug 17, 2021 at 4:56
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    \$\begingroup\$ @RohatKılıç I'm guessing it has to do with keeping the contacts very flat and providing adequate contact area for the mass and current- it's only 1.2mm thick, which is next to nothing. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Aug 17, 2021 at 4:57
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This is a very high permeability amorphous ferrite with Cobalt Iron, semi-shielded in an extreme low profile. You won't find any smaller parts with these specs.

I am looking for low profile inductors (<1.2mm) and could not find any regular shaped (square/ rectangle) inductors meeting the specificaton (1uH, 8A- Isat.)

< 1.2mm

  • very low probability of meeting your tight specs.

= 1.2 mm max.

  • use these [readily avail.]

The outside termination is possibly ultrasonically welded.

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