Why is one inductor lead shorter than the other?

Discussion in 'General Electronics Chat' started by DickCappels, Sep 29, 2015.

  1. DickCappels

    Thread Starter Moderator

    Aug 21, 2008
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    bourns.png
    The drawing above is from the datasheet for a Bourns inductor that I am using. One lead being shorter than the other is a surprise since the inductor is not magnetically biased. I don't remember seeing a phase indicator on an un-biased inductor before. It occurred to me that perhaps paying attention to winding direction might be useful when considering crosstalk between closely spaced inductors.

    Any thoughts practical application of the phase indicator?
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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    Last edited: Sep 29, 2015
  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Maybe simply because it is easier to first stick one leg in and then the other, than to try both at once?
     
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  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Not all in that series have the longer leg?
    Max.
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    When placed in a PCB, the leads get clipped to equal length before wave soldering.
     
  6. Brevor

    Active Member

    Apr 9, 2011
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    we used to produce a product that used inductors like the one you show. 2 were mounted facing each other (top to top) across a gap where a coin rolled past. One coil transmitted across the gap to the other coil. If someone wasn't paying attention and wired the transmit coil backwards the circuit wouldn't work.
     
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