> Those are listed as having material type "HY 2" and they are
> powdered iron, not ferrite

The OP did mention low frequency SMPS, so I thought them
worth a plug

> For example, compare it to 3F3 material

Thanks, I'll look into that.

Some of the SMPS controllers I use are much faster than 35kHz
and inductors used are small, both physically and in value (< 10uH),
which are easiest to buy as SMT or low-profile pre-wound

Joe
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