On 6/20/17 9:43 AM, Clif Keely via TowerTalk wrote:
How do the type numbers relate to things like permiability? How are they
sized? Who are the makers of there ferrites. I would like to learn more and
also look into buying from the major producers like TDK, Tokin, or Siemens.
Will other core shapes work?
Type numbers are like manufacturer part numbers, each mfr is different.
If you want to really delve into the materials, the best book is the one
by E.C. Snelling called "soft magnetic materials" or something like that.
Some of the mfr catalogs are good (e.g. Fair-rite) and on line and have
excellent explanatory and applications material, but Snelling is the
ultimate reference (it started as an app book from some mfr in the UK, I
believe).
For the more "industrial" mfrs (TDK, etc.) you need to find a rep who
can get you a connection to the factory. Folks at work who make
transformers are able to get the info, but I've never seen a catalog on
line. Typically, the big guys make stuff for someone else to package
and sell.
However, just having googled, I see that TDK now has most of their
material data sheets on line:
https://product.tdk.com/info/en/catalog/datasheets/ferrite_mn-zn_material_characteristics_en.pdf
is an example
https://product.tdk.com/info/en/catalog/datasheets/ferrite_emc_material_characteristics_en.pdf
might be more interesting for HF applications
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