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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: inductor polarity
Date: Fri, 28 Feb 2025 20:49:32 -0500
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"Jeroen Belleman" <jeroen@nospam.please> wrote in message 
news:vprtop$3jbo5$1@dont-email.me...
> On 2/28/25 04:50, john larkin wrote:
>> I need to put 16 of these on a very dense PC board.
>>
>> https://www.digikey.com/en/products/detail/murata-power-solutions-inc/19R476C/5798223
>>
>> Each of the eight channels needs two of these. If I can put each pair
>> of inductors close together and with the same current but opposed
>> field direction, I'll get minimum mag field leakage to other channels
>> (and to other boards.)
>>
>> I see that one lead is longer than the other. I wonder if that implies
>> a consistent winding direction, so my manufacturing people could use
>> that as the "pin1" indicator.
>>
>> If that's not dependable, I'll have to set up a rig to determine mag
>> field polarity, and mark one side with a red dot or something.
>>
>> I'd rather use surface-mount shielded inductors, but these tall
>> unshielded drum cores have way more L and less R than a shielded part,
>> for a given PCB footprint.
>>
>
> I can't see the Digikey link. They want me to switch off
> my adblocker, which is just no.

You don't have to. I haven't seen any ads on Digikey. But I do sometimes see 
this issue which can be fixed as follows.
Open Microsoft Edge.
Go to Digikey or paste the link.
Do the "Prove you're human" test by holding the mouse button down as needed.
Once the site opens, close Edge and forget about it again.
Open Firefox and paste the link. The site will open normally.

What's going on here is likely to be a system which stores the fact that the 
human test was passed at your specific public IP address.
The reason for this is to stop the myriad of bots out there from scraping 
the site content for their own purposes (AI training comes to mind).
As long as you're using the the same public IP address then you won't have 
to do the human test again for a specific length of time but I don't know 
how long (maybe a few days).

If you are on a system where your public IP address is likely to change 
often then you will likely have to do this often.

>
> If this is a solenoid, turning it 180 degrees is not going
> to make any difference! It will still be the same winding
> direction!
>
> Jeroen Belleman
>
>