EMI Core
ESD-R Series Toroidal Cores
Ring Type
Overview
The KEMET ESD-R Series solid
toroidal cores are designed for use on
round cable. A wide range of MnZn
and NiZn options are available in Bare,
Coated, and Case types.
Benefits
e
Toroidal Cores with Case
[RoHS Compliant]
Turns and Impedance Characteristics
Model
A turn is counted by the number of lead-wire windings
which pass through the inner hole of the core. Windings
※Other
sizes available. Please contact NEC TOKIN.
*Number of lead
+
Shape and
with tape(black)
wire wound
61.0
32.4
24.0
●
be checked that
frequency range is a reference only.
as adding
actual
resu
before
white
outside the core
－
1
1T
lts in
the
※Above
it is in the desired
on the outside of the core do not count. See Figure 1 for
Dimensions
range
Please test with
turns
device
of read
use.
passes through
lowering down
turn count.
Number
wire
the inner
Figure
=
2 – Relationship between impedance and
1T
3T
※Flame
resistant grade of the case : UL94V-2
hole of the
10
bESD-R
Series
(Representative
core
examples of
※Above
two, and three
reference only. Please test with actual device before use.
2T
one,
frequency range is a
turns.
= Turn count
example: ESD-R-16C)
（Represe
ntative Example：ESD-R-16C）
Impedance ( )
Impedance Increase
*Number of lead wire wound outside the core + 1
10000
ID
ESD-R-38C-1
ESD-R-47
ESD-R-47D-1
ESD-R-57
ESD-R-57D-1
Impedance ( )
1
1
bESD-R
Series
Impedance ( )
100
Impedance Increase
1
Fig.1 How to count turns
Resonance point changes to lower band
Fig.2 Relationship be
Adding turns will result in higher impedance while
Shape and
hole of the core wire passes through the inner
also
= Number of read
1
10
100
1000
Dimensions
Installation Example
= Turn count
1000
3T
lowering the effective frequency range. See Figure 2 for
bESD-R
Series
Frequency (MHz)
Shape and Dimensions
an example.
Fig.1 How to count turns
Fig.2 Relationship between impedance an
d turn counts
There
are two materials of ferrite, Ni-Zn series and Mn-Zn ser
2T
OD
T
ID
Core Material and Effective Frequency Range
are two materials of ferrite, Ni-Zn series and Mn-Zn ser
Note
that above
There
1T
2T
3T
OD
T
1T
10
e band range i
Ni-Zn series
a
is
reference
s
ies.
e
ive for kHz band range.
Impedance ( )
100
2T
Impedance ( )
lead wire wound outside the
There are two ferrite material options for
*Number ofof read wire passes throughcore + 1
1
e band
As
Mn-Zn series has lower resistance compared to Ni-Zn serie
range i
s a reference only. Examination of
s
Note
that above
= Number
the inner
1
10
100
1000
hole of the core
KEMET EMI Cores: Nickel-Zinc
OD
(Ni-Zn) and
Turn count
with actual instrument is necessary.
adequate insulation before use.
=
T
Frequency (MHz)
As
Mn-Zn series has lower resistance compared to Ni-Zn series,
make sure to provide
Manganese-Zinc (Mn-Zn). Each core material
Fig.1 How to count turns
Fig.2 Relationship between impedance an
d turn
½ ½
Characteristics (re
counts
Mn-Zn series vs Ni-Zn series
Z -f
adequate insulation
Impedance vs. Frequency
before use.
has a different resistance and effective
(measurement condition: measured with same-dimensio
ESD-R-12C-2
3 – Effective band range of Mn-Zn and Ni-Zn ferrite core material.
ESD-R-14A
Figure
frequency range. The Mn-Zn core material
Mn-Zn series vs Ni-Zn series
½ ½
Characteristics (representative example)
Z -f
1000
(Representative example, measured with
ies. Ni-Zn
ring core)
same-dimension
core)
There
are two materials of ferrite, Ni-Zn series and
condition: measured with same-dimension
series is
ring
e
(measurement
Mn-Zn ser
has lower resistance compared to the Ni-
1000
ive for kHz band range.
Zn; therefore, be sure to provide adequate
Note
that above
e band range i
s a reference only. Examination of
s
AM band range
insulation before use.
with actual
EMI Core
instrument is necessary.
10000
10000
1000
with actual instrument is necessary.
ID
3T
1000
100
3T
Impedance ( )
Impedance ( )
It is recommended to verify actual
1T
10
effectiveness in the target application with
1
measurements.
1
10
2T
Impedance ( )
For reference, the Ni-Zn core material is
adequate insulation before use.
100
Impedance vs. Frequency
typically effective for the frequencies in the
MnZn
(MHz)
(MHz)
Frequency
Mn-Zn series vs Ni-Zn series
Frequency
½ ½
Characteristics (representative example)
series core
Z -f
ESD-R-12D
ESD-R-19
core
MnZn series
MHz band range such as the FM-band, while
10000
10000
measured with same-dimension ring core)
(measurement condition:
1000
the Mn-Zn core material is typically effective for
EMI Core
10
10
1000
1000
the kHz band range such as the AM-band. See
12
3T
3T
Figure 3.
AM band range
FM band range
100
100
Impedance ( )
1
Impedance ( )
As
Mn-Zn series has lower resistance compared to Ni-Zn series,
8
100
10
1
10
100
1000
1T
AM band range
2T
10
make sure to provide
1T
NiZn series core
10
100
FM band range
NiZn serie
1
1
1000
100
2T
10
NiZn series core
1
1
1T
0.01
MnZn series core
1000
1
1
0.1
10
1
100
Frequency (MHz)
100
0.01
10
1000
0.1
100
1
1000
10
Frequency (MHz)
10
Fig.3
Frequency (MHz)
Fig.3
Frequency (MHz)
te
One world. One KEMET
1
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
EMI Core
E5001_ESD-R • 3/28/2017
14
1
0.01
0.1
1
10
100
1000
Impedance Increase
ESD-R-12D
When the desired performance of an EMI core cannot
ESD-R-19
be obtained with a single pass through the core, the
ESD-R-19D
ESD-R-25
impedance characteristics can be changed with multiple
ESD-R-25D
turns.
ESD-R-38
ESD-R-10D
9.5
5.0
10.0
●
ESD-R-10E
10.0
5.0
5.0
●
ESD-R-10S
10.5
5.5
20.0
●
When
ESD-R-12C
15.0
●
Characteristics
11.8
how
7.3
count turns
desired performance can not be obtained just b
and
to
ESD-R-12E
11.8
7.3
8.0
●
value can be raised b
y increasing th
e
sses through the inner
turn. In this case, the
Number
of turns are counted by how many times the lead wire pa
ESD-R-12F
12.0
8.5
15.0
●
Dimensions (mm)
7.0
Frequency range
ESD-R-12S
12.0
5.5
●
Compatible toroidal core
be checked
wire winding
adding turns resu
hole of the core. Do not count the number of lead
that it is in the desired range as
●
core, as it results
outside the
Model
Color of coating
ESD-R-14C
14.0
7.0
3.0
(bare type)
OD
ID
T
up to 100MHz
up to 300MHz
Dimensions (mm)
range
ESD-R-14E
Frequency
14.0
10.0
8.0
●
(mainly AM band range)
Color of case
range)
(mainly FM band
Compatible toroidal core
Ring Type
Remarks
ESD-R-14S
14.3
6.3
●
(bare type)
OD
ID
T
up to 100MHz
desired performance can
28.5
be obtained just b
●
up
ESD-R-12C-2
7.3
15.3
When
12.0 15.0
to 300MHz
not
y 1
Blue
turn, impedance characteristics
（Repr
ESD-R-15C-1
10.5
12.0
●
Green
－
ESD-R-14A
6.2
3.5
(mainly
range)
(mainly
10000
ESD-R-16
11.6
●
Tips on EMI Core Usages
AM band
can
15.0
raised b
FM band range)
8.4
●
e frequency band should
value
be
15.8
y increasing th
e turn. In this
●
case, the
Blue
ESD-R-14C
ESD-R-14C-2
14.0
7.0
3.0
ESD-R-16C
16.0
9.0
17.0
●
black
12.9
6.0
6.4
Blue
ESD-R-15C
checked that it is in
12.5
desired range as adding turns resu
ESD-R-12S
15.2
10.5
●
the
●
ESD-R-17S
17.5
9.5
28.5
●
lowering
be
lts in
ESD-R-15C-1
down the
Blue
ESD-R-17S
white
●
ESD-R-19S
ESD-R-17S-1
17.7
9.4
28.8
19.0
9.0
11.0
●
ESD-R-18SD
18.0
10.0
6.0
●
Blue
－
1000
ESD-R-19E-1
19.0
10.7
●
10.0
5.3
●
black
●
ESD-R-19SD
ESD-R-19S
18.5
10.0
19.0
9.0
Characteristics and how to count turns
11.0
Blue
－
ESD-R-25D-8
25.0
15.0
8.0
●
ESD-R-19SD
18.5
10.0
10.0
●
white
（Represe
ntative Example：ESD-R-16C）
ESD-R-25S
26.0
14.0
15.0
●
Blue
ESD-R-25L-A
25.3
ESD-R-22SD
22.5
13.8
6.4
●
Number
of turns are counted by
15.1
many times the lead wire pa
black
●
how
12.1
sses through the inner
ESD-R-25SD
10000
ESD-R-25SD
26.0
14.0
15.0
Blue
－
ESD-R-28C-1
28.2
15.8
●
15.0
13.2
●
ESD-R-25SD
25.0
12.0
●
Resonance point changes
Green
hole of the core. Do not count the number of
15.0
wire
12.0
lead
winding
outside the core, as it results
ESD-R-31C
100
to lower b
white
●
ESD-R-38D
ESD-R-31C-1
32.0
18.5
9.0
39.0
17.5
14.0
●
ESD-R-25S
25.0
●
with tape(black)
white
－
ESD-R-26S
26.0
28.5
●
39.0
17.5
14.0
●
13.0
※Above
frequency range is a reference only. Please test with actual device before use.
1000
3T
ESD-R-28C
28.0
16.0
13.0
●
white
2T
－
48.0
25.5
16.0
●
3T
10
When
desired performance can not be obtained just
8.0
1T
b
y 1 turn, impedance characteristics
●
ESD-R-31C
31.0
19.0
with tape(black)
white
－
48.0
25.5
16.0
●
19.0
ESD-R-38D
38.1
12.7
●
2T
should
value can be raised b
y increasing th
e turn. In this case, the
100
e frequency band
white
－
61.0
32.4
24.0
●
• MnZn (≤ 100 MHz, AM band range)
• Consumer
Ring Type
[RoHS Compliant]
Ring Type
Tips on
and NiZn (≤ 300 MHz, FM band
EMI Core Usages
electronics
Ring Type
range) options available
•
EMI Cores
Solid construction
Characteristics and how
Toroidal Cores (Coated Type)
to count turns
Ring Type
• Bare, Coated, and Case
Dimensions (mm)
Number
of turns are counted by how many times the lead wire
types
Frequency range
Model
[RoHS Compliant]
ID
OD
T
up to 100MHz(mainly AM band range) up to 300MHz(mainly FM band range)
available
Core Usages
Tips on EMI
hole of the core. Do not count the number of lead wire winding
Toroidal Cores (Bare Type)
Ring Type
EMI Cores
Applications
EMI Cores
Figure 1 – How to count turns
EMI C
Integrated technical exchanges
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