Author Topic: Inductor symbol with asymmetric pins length, why ?  (Read 1485 times)

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Offline BravoVTopic starter

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Inductor symbol with asymmetric pins length, why ?
« on: July 08, 2018, 05:17:49 pm »
As inductor is non polar, why asymmetric pins printed on this big inductor ? (photo attached below)

Its dipped inside the yellow epoxy,and both terminals are identical size & shape.

Pretty sure its not label printing error or misaligned, as it looks it was deliberately made.

Offline X

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #1 on: July 08, 2018, 05:27:44 pm »
It looks like the label was meant to be on the top where the pins protude, but then at the last minute they changed it on the side. It looks like it corresponds exactly with the relative positions of the physical pins.
 

Offline IanB

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #2 on: July 08, 2018, 05:29:46 pm »
You are asking what do the "ge" and "rt" mean?

Maybe someone from Germany knows what they might be a common abbreviation for.

According to the datasheet the part is symmetrical:

https://datasheet.octopart.com/B82504W-A-5-EPCOS-datasheet-13704512.pdf
 

Online Benta

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #3 on: July 08, 2018, 05:31:54 pm »
Because if Siemens had made the drawing symmetric, someone would complain that the terminals are not centered. Siemens was always very precise with this kind of thing.

 

Offline glarsson

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #4 on: July 08, 2018, 05:42:11 pm »
You are asking what do the "ge" and "rt" mean?
Perhaps:
ge = gelb = yellow
rt = rot = red
 

Offline CatalinaWOW

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #5 on: July 08, 2018, 06:26:38 pm »
Information redundancy.  The shorter symbol represents the connection on the near side of the device.  The longer symbol represents the connection on the far side of the device. 

The more ways you can tell something to somebody the higher the likelihood that the information will be received and understood.
 

Offline boB

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #6 on: July 08, 2018, 07:39:53 pm »

No  idea if this has any relevance in this case but sometimes an inductor will need its winding start end (inside of the coil) to go to the "noisy" part of the circuitry and the outside of the winding can go to ground or non-noisy end of the circuit so that the EMI's have a lower chance of emanating from the inductor.  i.e., an intrinsic Faraday shield of sorts.

boB
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Offline innkeeper

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Re: Inductor symbol with asymmetric pins length, why ?
« Reply #7 on: July 18, 2018, 09:18:53 pm »
 :-// tried to find it out of curiosity...seems to not be on the current epcos version.
Hobbyist and a retired engineer and possibly a test equipment addict, though, searching for the equipment to test for that.
 


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