Type 43 material for common-mode choke

bitrex · 2020-09-25T01:36:53+00:00

The article here says type 43 NiZn ferrite's resistive impedance exceeds it's reactance at about 2MHz but I think that's a misprint, looks more like 15MHz: The data-sheet is here: I have a bunch of FT37-43s ferrite toroids on hand and I need a 100uH common-mode choke for about 3 MHz, the calculator says about 30 turns should give me that but I'm unclear if this is an appropriate material

Sep 25, 2020 22 Replies

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legg 5 years ago

. . and I'm sure they're very useful in measuring actual components.

If you care to reconstruct the test sample, you might even be able to replot the graph in the 43 matl's data sheet, given sufficient test frequencies.

Enough of this foolery.

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legg 5 years ago

Those made with amorphous materials hold remenant values, that make testing or part qualification difficult.

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Steve Wilson 5 years ago

100Hz/120Hz/1kHz/10kHz/100kHz

The U1733C will do that for you. Up to 2GHz. Unfortunately, it is a very expensive unit.

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