05290531| Datasheet

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Toroids (Ring Cores) General Information Toroids (ring cores)
Our product line includes a wide range of toroids with finely graded diameters ranging from 2,5 to 200 mm. Other core heights can be supplied on request. All cores are available in the usual materials. Applications
I Toroids are primarily used as EMC chokes for suppressing RF interference in the MHZ region

and in signal transformers. Typical applications for toroids of NiZn ferrites are LAN chokes. One of the materials available for this purpose is K10; other materials upon request. The following high-permeability MnZn materials are available for interference suppression: R2,5 through R12,5 for telecommunications, e.g. ISDN (N30, T38, T46, T56) R13,3 through R26 for power line chokes (N30, T65, T35 to T56) > R34 for chokes and filters in industrial use (T65)
I Toroids are also increasingly used for power applications. Here, the typical values for amplitude

permeability and power loss, as summarized in the section on "SIFERRIT Materials " (page 31), are applicable to the special power materials. Coating Toroids are available in different coating versions, thus offering the appropriate solution for every application. The coating not only offers protection for the edges but also provides an insulation function. For small ring cores, we have introduced a parylene coating (Galxyl) which features a low coating thickness and high dielectric strength. Coatings of ring cores Version Main application Layer thickness Breakdown voltage (minimum values) Mechanical quality Advantage UL rating Ordering code Epoxy (blue) Medium/big sizes ( R9,53) < 0,4 mm Galxyl (Parylene) Small sizes ( R9,53) 0,012 or 0,025 mm

> 1,0 kV (for R9,53; R10) > 1 kV > 1,5 kV (for R12,5 thru R20) (standard value) > 2,0 kV (for > R20) High firmness Low influence on AL value UL 94 V-0 B64290-L... Smooth surface approx. 130 C Very low thickness UL 94 V-0 B64290-P...

Maximum temperature (short-time) approx. 180 C

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