Inductor shielding - fully enclosed vs alternatives

[findAround]

I'm reviewing an old design to see if I can pinch pennies anywhere. It has 2 switching regulators which use this shielded Bourns inductor:



Much cheaper inductors are available with similar specs, and they also claim to be shielded, however the proper ferrite shielding seems to just be on the top/bottom (example TDK-brand inductor below). It's like a ferrite bobbin that has had the windings covered in some kind of goop.



My question: For the cheaper, less enclosed style shown, do they use conductive epoxy or something to ensure the actual windings are shielded? Is this shielding comparable to the fully enclosed style of the Bourns inductor? Or is it going to behave much worse, noise-wise? If anyone has had experience with both types it would be great to hear your thoughts.

If a non-enclosed inductor like the TDK one shown will be much noiser (trying to keep switching noise out of analog sections), then I'll look for pennies elsewhere.  Cheers!

[Kleinstein]

The shape of the ferrite core is not about electrical shielding, but to reduce the magnetic stray field. Conductive epoxy would not make a difference.

[moffy]

If the epoxy rather than having conductive particles had say ferrite particles it might offer some magnetic shielding, but not as well as a solid ferrite.

[findAround]

For future readers with the same question:

After some more research, I've found the second type is referred to as 'semi-shielded' and does indeed use magnetic epoxy to shield the windings.

Semi-shielded inductors are cheaper and smaller than shielded inductors, but seem to have a noise performance that is only slightly better than totally unshielded (see graph, from a Würth application note).
For my design this means I'll be sticking to fully shielded.

[moffy]

For future readers with the same question:

After some more research, I've found the second type is referred to as 'semi-shielded' and does indeed use magnetic epoxy to shield the windings.

Semi-shielded inductors are cheaper and smaller than shielded inductors, but seem to have a noise performance that is only slightly better than totally unshielded (see graph, from a Würth application note).
For my design this means I'll be sticking to fully shielded.

Thanks for the update, it is one thing to surmise, it is nice to get it right sometimes.