What Lies Within: SMT Inductor Teardown

Ever wonder what’s inside a surface-mount inductor? Wonder no more as you watch this SMT inductor teardown video.

“Teardown” isn’t really accurate here, at least by the standard of [electronupdate]’s other component teardowns, like his looks inside LED light bulbs and das blinkenlights. “Rubdown” is more like it here, because what starts out as a rather solid looking SMT component needs to be ground down bit by bit to reveal the inner ferrite and copper goodness. [electronupdate] embedded the R30 SMT inductor in epoxy and hand lapped the whole thing until the windings were visible. Of course, just peeking inside is never enough, so he set upon an analysis of the inductor’s innards. Using a little careful macro photography and some simple image analysis, he verified the component’s data sheet claims; as an aside, is anyone else surprised that a tiny SMT component can handle 30 amps?

Looking for more practical applications for decapping components? How about iPhone brain surgery?

[via Dangerous Prototypes]

10 thoughts on “What Lies Within: SMT Inductor Teardown

  1. Interesting but I would have been more interested in seeing how the marked value compared to a measured value with a good LCR bridge. IMHO the entire video kind of fell apart at the end with what I would consider less than accurate measurements of the coils and what seems to be an assumption on the permeability of the core. A good measurement would have been more interesting to me.

    1. Or you could just read the datasheet. Inductors typically have pretty wide tolerance bands (like 20%; I’m assuming it’s down to variations in the core material) and some funky variations in performance wrt frequency due to self-resonance, but it’s not like the manufacturers habitually lie about their performance.

      1. This isn’t about the manufacturer’s claims about their components, in the video he comments about if they sold you a real part or not. So more like, is it a genuine and capable part, or is it going to melt itself off the PCB?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s