No standards AFAIK, similar performance ferrites from different makers
have different names. Or one might say there are so many standards that
every body can have their own. One text will use one makers ID
(letters) and another will use Fair-Rites numbers. It's up to the
engineer to figure that out and measure how "compatible" they are.
Many Fair-Rite part numbers do include their 2 digit ferrite type in the
longer number as digit positions 3 & 4.
Making highly technical ferrites to precise specs is difficult. It's a
messy business with wide manufacturing tolerances. When we made memory
cores most of the finished product failed final electrical test and went
back into the ball mills.
Grant KZ1W
On 11/10/2021 12:01, Chuck Gooden wrote:
Could someone explain where the FT240-31 designation for ferrites came
from. I do not see this in the Fair-Rite catalog or any manufactures
that use this designation as a part number. If you Google "FT240-31" you
will be directed to a different part number made by Fair-rite
I realize that it means a 2.4 inch diameter torrid of type 31 material.
So is this an industry standard for classifying the shape and size of
ferrite components, if so what is the standard?
Chuck K9LC
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