EMI Cores
ESD-SR Series Snap-on Cores for Round Cables
Overview
KEMET ESD-SR Series snap-on cores
are designed for use on round cable
and are available in a variety of sizes.
EMI cores are part of a family of
passive components which address
the issues of noise or electromagnetic
interference (EMI) in circuits or
systems.
EMI Cores
Benefits
EMI Cores
Applications
• Snap-on convenience
Ring Type
• Consumer electronics
• Split construction
Tips on EMI Core Usages
• Temperature Index of 65°C
EMI Cores
• Meets the requirements of UL94V-0
Ring Type
Characteristics and how to count turns
• CTI: Rank 0
Number
of turns are counted by how many times the lead wire
Tips
range by
Usages
• Broad
on EMI Core
simply adding turns
hole of the core. Do not count the number of lead wire winding
Characteristics and how to count turns
When
desired performance can not be obtained just b
Number
of turns are counted by how many times the lead wire pa
value can be raised b
e turn. In this case,
hole of the core. Do not count the number of lead wire winding
y increasing th
outside the core, as it results
the
When
desired performance can not be obtained just b
value can be raised b
y 1 turn, impedance characteristics
sses through the inner
be checked that it is in the desired range as adding turns resu
e turn. In this case, the
Turns and Impedance Characteristics
Ring Type
sses through the inner
Impedance Increase
A turn is counted by the number of lead-wire windings
When
desired performance can not be obtained just b
y 1 turn, impedance characteristics
2T
1T
2T
3T
100
e frequency band should
value can
Windings
which pass through the inner hole of the core.
be raised b y increasing th e turn. In this case, the
1T
resu
lts in
on the outside of the core do not count.
be checked that
1 for
the desired range
2T
as adding turns
– Relationship between
lowering down the
count.
See Figure
it is in
1T
Figure 2
3T
of lead wire wound outside the
impedance and turn
10
*Number
core + 1
= Number of read wire passes through the
examples of one, two, and three turns.
(Representative example: ESD-R-16C)
inner
hole of the core
（Represe
ntative Example：ESD-R-16C）
Impedance ( )
outside the core, as it results
1000
3T
Resonance point changes to lower
Impedance ( )
100
10
1
1
Fig.1 How to count turns
Impedance ( )
Impedance Increase
Adding turns will result in higher impedance while also
lowering the effective frequency range. See Figure 2 for
an example.
*Number of lead wire wound outside the core + 1
1
10000
= Turn count
= Number of read wire passes through the inner
1
10
100
1000
Resonance point changes to lower band
hole of the core
= Turn count
Fig.1 How to count turns
Fig.2 Relationship b
1000
3T
2T
Frequency (MHz)
Fig.2 Relationship between impedance an
d turn count
1T
2T
Core Material and Effective Frequency Range
There
are two materials of ferrite, Ni-Zn series and Mn-Zn ser
3T
10
e band range i
1
There
are two materials of ferrite, Ni-Zn series and Mn-Zn ser
1T
100
ies. Ni-Zn series is
e
There are two ferrite material options for
with actual instrument is necessary.
10
100
1000
is necessary.
1
KEMET EMI Cores: Nickel Zinc (NiZn) and
As
Mn-Zn series has lower resistance compared
sure
Ni-Zn seri
Frequency (MHz)
As
Mn-Zn series has lower resistance compared to Ni-Zn series,
make
to
to provide
Manganese Zinc (MnZn). Each core material
Fig.1 How to
adequate insulation before use.
adequate
between impedance an
use.
count turns
Fig.2 Relationship
insulation before
d turn counts
has a different resistance and effective
Figure 3 – Effective band range of MnZn and NiZn ferrite core material.
Mn-Zn series vs Ni-Zn series
½ ½
series vs Ni-Zn series
Z -f
Mn-Zn
Characteristics (representative example)
Z -f
(Representative example,
measured with
with same-dimension ring
½ ½
Characteristics (r
measured
same-dimension ring core)
core)
frequency range. The MnZn core material
(measurement condition:
There
are two materials of ferrite, Ni-Zn series and Mn-Zn ser
ies. Ni-Zn series is
e
(measurement condition: measured with same-dimensi
1000
has a lower resistance compared to the NiZn;
ive for kHz band range.
1000
therefore, adequate insulation is required
that above
e band range i
s a reference only. Examination of
s
Note
with actual instrument is necessary.
before use.
AM band range
FM band range
The NiZn core material is typically effective
100
for frequencies in the MHz band range such as
series vs Ni-Zn series
Mn-Zn
½ ½
MnZn series core
Z -f Characteristics (representative example)
(measurement condition: measured with same-dimension ring core)
the FM-band, while the MnZn core material is
MnZn series core
1000
typically effective for the kHz band range such
10
as the AM-band. See Figure 3.
Impedance ( )
adequate insulation before use.
100
As
Mn-Zn series has lower resistance compared to Ni-Zn series,
make sure to
AM band range
provide
NiZn series core
Note
that above
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
with actual instrument
hole of the core
= Turn count
Note
that above
s a reference only. Examination of
e band range i
ive for kHz band range.
s a reference
s
NiZn ser
Impedance ( )
It is recommended to measure the actual
frequency range effectiveness in the target
application.
AM band range
1
Impedance ( )
10
FM band range
100
NiZn series core
MnZn series core
Fig.3
0.01
0.1
1
10
100
1000
1
Frequency (MHz)
0.01
te
One world. One
1
KEMET
0.1
10
Frequency (MHz)
E5005_ESD-SR • 3/28/2017
1
10
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
Fig.3
1
Impedance Increase
When the desired performance of an EMI core cannot
be obtained with a single pass through
Characteristics and how to count turns
the core, the
impedance characteristics can be changed with multiple
Number
of turns are counted by how many times the lead wire pa
turns.
hole of the core. Do not count the number of lead wire winding
Tips on EMI Core Usages
Figure 1 – How to count turns
be checked that it is in the desired range as adding turns resu
10000
y increasing th
e frequency band should
（Rep
10000
lts in lowering down the
（Represe
ntative Example：ESD-R-16C）
1000
EMI
SD-SR Series
b
Flame Class : UL94V-0
Temperature Index : 65˚C
CTI : Rank 0
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
Dimensions –
Shape and Dimensions
bESD–SR–
ESD-SR
Millimeters
bESD–SR–S
ESD-SR-S
D
A
C
B
D
A
C
See Table 1 for dimensions
Case Color
ESD-SR-□□□ （blank）Black
ESD-SR-□□□G Gray
ESD-SR-□□□ V Violet
※Black only for
ESD-SR-S□□
Environmental Compliance
Impedance vs. Frequency
are RoHS Compliant.
All KEMET EMI cores
1000
ESD-SR-100
1000
ESD-SR-110
Impedance ( )
100
Impedance ( )
Table 1 – Ratings & Part Number Reference
1T
1
B
100
1T
Case color code added to end of ESD-SR part number: Blank = black, G = gray, V = violet. ESD-SR-S series only available in black.
10
Part Number
ESD-SR-100
ESD-SR-110
ESD-SR-S10
ESD-SR-120
ESD-SR-150
ESD-SR-160
ESD-SR-250
ESD-SR-S16
ESD-SR-S25
Dimensions (mm)
10
A Maximum
B Maximum
16.5
14.2
14.0
1000
16.4
20.3
20.0
31.6
20.0
29.0
C Maximum
21.0
28.0
1
18.5
1
33.0
37.4
39.0
38.0
20.5
15.5
øD
Weight
(g)
Case Color
1
Black, Gray, Violet
Black, Gray, Violet
1000
Black
Black, Gray, Violet
Black, Gray, Violet
Black, Gray, Violet
Black, Gray, Violet
Black
Black
1
1
8
MI Core
16.5
14.4
15.5
10
100
16.0
Frequency (MHz)
19.6
20.2
31.5
23.0
33.0
≤ 6.0
7.2
≤ 5.0
6.9
≤ 6.0
10
4.1
100
≤ 6.0
Frequency (MHz)
13.3
≤ 7.0
23.4
≤ 9.0
22.7
≤ 13.0
59.5
≤ 8.0
12.9
≤ 14.5
21.3
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5005_ESD-SR • 3/28/2017
2
D
A
C
D
A
C
Case Color
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
ESD-SR-□□□ （blank）Black
ESD-SR-□□□G Gray
ESD-SR-□□□ V Violet
※Black only for
ESD-SR-S□□
Impedance vs. Frequency
Impedance vs. Frequency
1000
ESD-SR-100
1000
ESD-SR-110
Impedance ( )
100
Impedance ( )
1T
100
1T
10
10
1
Snap-on TypeEMI
Cores
1
10
Ring Type
Frequency (MHz)
100
1000
1
1
10
Frequency (MHz)
100
1000
Snap-on TypeEMI
Cores
Ring Type
EMI
Impedance vs. Frequency
Core
ESD-SR-S10
18
Snap-on TypeEMI
Cores
1000
Impedance ( )
Impedance ( )
Impedance ( )
10000
ESD-SR-120
ESD-SR-120
3T
2T
1T
ESD-SR-120
3T
2T
3T
1T
10 2T
1T
100
1000
1000
100
Impedance vs. Frequency
1000
100
10
Impedance ( )
Impedance ( )
Impedance ( )
Impedance
Ring Type
vs. Frequency
ESD-SR-S10
1T
10000
100
1000
10
1000
ESD-SR-S10
1T
10000
100
10
1
1T
1
10
100
1000
1
10 1
10
1
10000
ESD-SR-150
1
Frequency (MHz)
100
1000
100
10
Impedance ( )
Impedance ( )
Impedance ( )
1
3T
Impedance ( )
Impedance ( )
Impedance ( )
1000
1
10000
100
1000
10
ESD-SR-150
ESD-SR-150
3T
1T
2T
3T
1T
Frequency (MHz)
100
1000
1
10000
10 1
1000
1
10000
100
1000
10
ESD-SR-160
ESD-SR-160
Frequency (MHz)
10
Frequency (MHz)
100
1000
2T
Frequency
10
(MHz)
100
1000
1
3T
10
2T
10000
10000
ESD-SR-160
1T
3T
2T
3T
1T
2T
Frequency (MHz)
100
1000
100
1000
1
10 1
100
1000
1
10 1
100
10
2T
1
10000
10 1
ESD-SR-250
1T
ESD-SR-250
Frequency (MHz)
100
1000
10
100
10
Frequency (MHz)
100
1000
1
10000
10 1
ESD-SR-S16
1T
10
Frequency (MHz)
100
1000
Impedance ( )
Impedance ( )
Impedance ( )
1
3T
Impedance ( )
Impedance ( )
Impedance ( )
1000
1
10000
100
1000
10
10000
ESD-SR-250
1T
3T
2T
3T
1T
2T
Frequency
10
(MHz)
100
1000
1000
1
10000
100
1000
10
ESD-SR-S16
1
3T
10
Frequency (MHz)
100
1000
10000
ESD-SR-S16
1T
3T
Frequency (MHz)
2T
100
1000
100
1000
100
1000
2T
3T
1T
10
2T
Frequency
100
1
10 1
10
2T
1
10000
10 1
1T
ESD-SR-S25
10
Frequency (MHz)
100
1000
100
1
10 1
(MHz)
100
1000
Impedance ( )
Impedance ( )
Impedance ( )
1000
1
10000
100
1000
10
ESD-SR-S25
1
3T
10
2T
ESD-SR-S25
3T
1T
2T
1T
10
Frequency (MHz)
100
1000
1
10 1
1T
10
Frequency (MHz)
100
1000
Frequency (MHz)
100
1000
1
1
10
Frequency (MHz)
100
1000
10000
100
1000
© KEMET Electronics Corporation
3T
P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
•
100
Frequency (MHz)
2T
1
10 1
1T
10
1
10 1
100
1000
E5005_ESD-SR • 3/28/2017
3
Frequency (MHz)
100
1000
10000
10000
Impedance ( )
3T
2T
Impedance ( )
1000
1000
3T
100
2T
1T
10
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
1T
10
100
Impedance vs. Frequency Cont’d
1
1
10
10000
ESD-SR-S25
Frequency (MHz)
100
1000
1
1
10
Frequency (MHz)
100
1000
Impedance ( )
1000
3T
2T
1T
100
10
1
1
10
Frequency (MHz)
100
1000
EMI Core
19
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5005_ESD-SR • 3/28/2017
4
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
KEMET Electronic Corporation Sales Offices
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Disclaimer
All product specifications, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed.
All Information given herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET specifically disclaims – any warranty concerning suitability for a specific customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no
obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or
property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other
measures may not be required.
KEMET is a registered trademark of KEMET Electronics Corporation.
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5005_ESD-SR • 3/28/2017
5
