Data SheetData Sheet
Date: September 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS’ prior express consent is prohibited.
Ferrites and accessories
General information and overview
209/06
Please read Important notes
and Cautions and warnings.
Our product line includes a wide range of toroids with finely graded diameters ranging from 2.5 to
202 mm.
Other core heights can be supplied on request. All cores are available in the usual materials.
Applications
■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 on request.
The following high-permeability MnZn materials are available for interference suppression:
–R 2.5 through R 12.5 for telecommunications, e.g. ISDN (N30, T38, T46)
–R 13.3 through R 26 for power line chokes (N30, T65, T35, T37, T38)
–>R 34 for chokes and filters in industrial use (T65)
■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 1),
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 func-
tion.
For small ring cores, we have introduced a parylene coating which features a low coating thickness
and high dielectric strength.
Coatings of ring cores
Version Epoxy
(blue)
Parylene
(transparent)
Main application Medium/big sizes (≥ R 9.53) Small sizes (< R 9.53)
Layer thickness < 0.4 mm 0.012 or 0.025 mm
Breakdown voltage
(minimum values)
> 1.0 kV (for R 9.53; R 10)
> 1.5 kV (for R 12.5 thru R 20)
> 2.0 kV (for > R 20)
> 1 kV
(standard value)
Mechanical quality High firmness Smooth surface
Maximum temperature (short-time) approx. 180 °Capprox. 130 °C
Advantage Low influence on AL value Very low thickness
UL rating UL 94 V-0 UL 94 V-0
Ordering code B64290L…B64290P…
General information
Toroids (ring cores)
Toroids (ring cores)
309/06
Please read Important notes
and Cautions and warnings.
Dielectric strength test
The following test setup is used to test the dielectric strength of the insulating coating: A copper ring
is pressed to the top edge of the ring. It touches the ferrite ring at the edges (see diagram).
The test duration is 2 seconds.
Chamfer
Large toroidal cores use thick wires that are partially subjected to high mechanical stress during
winding. This can damage the wire insulation as well as the coating of the cores, thus reducing the
breakdown voltage. To avoid this, EPCOS toroids have a chamfer. This prevents any insulation
damage, and produces uniform coating thickness at the same time.
Compilation of the ordering code
Ferrite ring
Metal poles
Vrms
FUS0127-3
Core size Design
Small Edges rounded by tumbling
Medium Chamfer on edges and/or radius on the surface
Medium/big Chamfer on edges
B64290 L 668 X 38
Block1 Block2 Block3
Ferrite toroid
Coating material
Type (size)
coded
Parylene P
Epoxy L
Uncoated A
X = Dummy character
Code number for material
(exception: material N30 = 830)
0 0
General information
Toroids (ring cores)
409/06
Please read Important notes
and Cautions and warnings.
Overview of available sizes
Type Type code
(ordering code,
block 2)
Page
Toroid size (da × di × h)
mm inch
R 2.50 × 1.50 × 1.00 R 0.098 × 0.059 × 0.039 P0035 1
R 2.54 × 1.27 × 1.27 R 0.100 × 0.050 × 0.050 P0734 1
R 3.05 × 1.27 × 1.27 R 0.120 × 0.050 × 0.050 P0683 2
R 3.05 × 1.27 × 2.54 R 0.120 × 0.050 × 0.100 P0739 2
R 3.05 × 1.78 × 2.03 R 0.120 × 0.070 × 0.080 P0733 3
R 3.43 × 1.78 × 1.78 R 0.135 × 0.070 × 0.070 P0731 3
R 3.43 × 1.78 × 2.03 R 0.135 × 0.070 × 0.080 P0745 4
R 3.43 × 1.78 × 2.11 R 0.135 × 0.070 × 0.083 P0709 4
R 3.94 × 1.78 × 1.78 R 0.155 × 0.070 × 0.070 P0732 5
R 3.94 × 2.24 × 1.30 R 0.155 × 0.088 × 0.051 P0061 5
R 4.00 × 2.40 × 1.60 R 0.157 × 0.094 × 0.063 P0036 6
R 5.84 × 3.05 × 3.00 R 0.230 × 0.120 × 0.118 P0687 6
R 6.30 × 3.80 × 2.50 R 0.248 × 0.150 × 0.098 P0037 7
R 8.00 × 4.00 × 4.00 R 0.315 × 0.158 × 0.158 P0751 7
R 9.53 × 4.75 × 3.17 R 0.375 × 0.187 × 0.125 L0062 8
R 10.0 × 6.00 × 4.00 R 0.394 × 0.236 × 0.157 L0038 8
R 12.5 × 7.50 × 5.00 R 0.492 × 0.295 × 0.197 L0044 9
R 12.7 × 7.90 × 6.35 R 0.500 × 0.311 × 0.250 L0742 9
R 13.3 × 8.30 × 5.00 R 0.524 × 0.327 × 0.197 L0644 10
R 14.0 × 9.00 × 5.00 R 0.551 × 0.354 × 0.197 L0658 10
R 15.0 × 10.4 × 5.30 R 0.591 × 0.409 × 0.209 L0623 11
R 15.8 × 8.90 × 4.70 R 0.622 × 0.350 × 0.185 L0743 11
R 16.0 × 9.60 × 6.30 R 0.630 × 0.378 × 0.248 L0045 12
R 17.0 × 10.7 × 6.80 R 0.669 × 0.421 × 0.268 L0652 12
R 18.4 × 5.90 × 5.90 R 0.724 × 0.232 × 0.232 L0697 13
R 20.0 × 10.0 × 7.00 R 0.787 × 0.394 × 0.276 L0632 13
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Toroids (ring cores)
509/06
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Overview of available sizes (continued)
Type Type code
(ordering code,
block 2)
Page
Toroid size (da × di × h)
mm inch
R 22.1 × 13.7 × 6.35 R 0.870 × 0.539 × 0.250 L0638 14
R 22.1 × 13.7 × 7.90 R 0.870 × 0.539 × 0.311 L0719 14
R 22.1 × 13.7 × 12.5 R 0.870 × 0.539 × 0.492 L0651 15
R 22.6 × 14.7 × 9.20 R 0.890 × 0.579 × 0.362 L0626 15
R 25.3 × 14.8 × 10.0 R 0.996 × 0.583 × 0.394 L0618 16
R 25.3 × 14.8 × 15.0 R 0.996 × 0.583 × 0.590 L0615 16
R 25.3 × 14.8 × 20.0 R 0.996 × 0.583 × 0.787 L0616 17
R 29.5 × 19.0 × 14.9 R 1.142 × 0.748 × 0.587 L0647 17
R 30.5 × 20.0 × 12.5 R 1.201 × 0.787 × 0.492 L0657 18
R 34.0 × 20.5 × 10.0 R 1.339 × 0.807 × 0.394 L0058 18
R 34.0 × 20.5 × 12.5 R 1.339 × 0.807 × 0.492 L0048 19
R 36.0 × 23.0 × 15.0 R 1.417 × 0.906 × 0.591 L0674 19
R 38.1 × 19.05 × 12.7 R 1.500 × 0.750 × 0.500 L0668 20
R 40.0 × 24.0 × 16.0 R 1.575 × 0.945 × 0.630 L0659 20
R 41.8 × 26.2 × 12.5 R 1.646 × 1.031 × 0.492 L0022 21
R 50.0 × 30.0 × 20.0 R 1.969 × 1.181 × 0.787 L0082 21
R 58.3 × 32.0 × 18.0 R 2.295 × 1.260 × 0.709 L0043 22
R 58.3 × 40.8 × 17.6 R 2.295 × 1.606 × 0.693 L0040 22
R 58.3 × 40.8 × 20.2 R 2.295 × 1.606 × 0.795 L0042 23
R 63.0 × 38.0 × 25.0 R 2.480 × 1.496 × 0.984 L0699 23
R 68.0 × 48.0 × 13.0 R 2.677 × 1.890 × 0.512 L0696 24
R 87.0 × 54.3 × 13.5 R 3.425 × 2.138 × 0.531 L0730 24
R 102 × 65.8 × 15.0 R 4.016 × 2.591 × 0.591 L0084 25
R 140 × 103 × 25.0 R 5.512 × 4.055 × 0.984 A0705 25
R 202 × 153 × 25.0 R 7.953 × 6.024 × 0.984 A0711 26
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B64290Overview
Toroids (ring cores)
