1© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5005_ESD-SR • 3/28/2017
One world. One KEMET
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.
Benets
• Snap-on convenience
• Split construction
• Temperature Index of 65°C
• Meets the requirements of UL94V-0
• CTI: Rank 0
• Broad range by simply adding turns
Applications
• Consumer electronics
EMI Core
5
EMI Cores
Ring Type
　There are two materials of ferrite, Ni-Zn series and Mn-Zn ser ies. Ni-Zn series is e
ive for kHz band range.
　Note that above e band range i s a reference only. Examination of s
with actual instrument is necessary.
　As Mn-Zn series has lower resistance compared to Ni-Zn series, make sure to provide
adequate insulation before use.
Characteristics and how to count turns
　Number of turns are counted by how many times the lead wire pa sses through the inner
hole of the core. Do not count the number of lead wire winding outside the core, as it results
　When desired performance can not be obtained just b y 1 turn, impedance characteristics
value can be raised b y increasing th e turn. In this case, the e frequency band should
be checked that it is in the desired range as adding turns resu lts in lowering down the
Tips on EMI Core Usages
（Represe ntative Example：ESD-R-16C）
Fig.1　How to count turns Fig.2　Relationship between impedance an d turn counts
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
hole of the core
= Turn count
Mn-Zn series vs Ni-Zn series ｜Z｜-f Characteristics (representative example)
(measurement condition: measured with same-dimension ring core)
Fig.3　te
AM band range FM band range
MnZn series core
NiZn series core
Impedance (Ω)
1000
100
10
1
0.01 0.1 1 10 100 1000
Impedance Increase
Resonance point changes to lower band
3T
2T
1T
Frequency (MHz)
Impedance (Ω)
Frequency (MHz)
10000
1 10 100 1000
1000
100
10
1
3T2T1T
Figure 1 – How to count turns
EMI Core
5
EMI Cores
Ring Type
　There are two materials of ferrite, Ni-Zn series and Mn-Zn ser ies. Ni-Zn series is e
ive for kHz band range.
　Note that above e band range i s a reference only. Examination of s
with actual instrument is necessary.
　As Mn-Zn series has lower resistance compared to Ni-Zn series, make sure to provide
adequate insulation before use.
Characteristics and how to count turns
　Number of turns are counted by how many times the lead wire pa sses through the inner
hole of the core. Do not count the number of lead wire winding outside the core, as it results
　When desired performance can not be obtained just b y 1 turn, impedance characteristics
value can be raised b y increasing th e turn. In this case, the e frequency band should
be checked that it is in the desired range as adding turns resu lts in lowering down the
Tips on EMI Core Usages
（Represe ntative Example：ESD-R-16C）
Fig.1　How to count turns Fig.2　Relationship between impedance an d turn counts
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
hole of the core
= Turn count
Mn-Zn series vs Ni-Zn series ｜Z｜-f Characteristics (representative example)
(measurement condition: measured with same-dimension ring core)
Fig.3　te
AM band range FM band range
MnZn series core
NiZn series core
Impedance (Ω)
1000
100
10
1
0.01 0.1 1 10 100 1000
Impedance Increase
Resonance point changes to lower band
3T
2T
1T
Frequency (MHz)
Impedance (Ω)
Frequency (MHz)
10000
1 10 100 1000
1000
100
10
1
3T2T1T
Figure 2 – Relationship between impedance and turn count.
(Representative example: ESD-R-16C)
EMI Core
5
EMI Cores
Ring Type
　There are two materials of ferrite, Ni-Zn series and Mn-Zn ser ies. Ni-Zn series is e
ive for kHz band range.
　Note that above e band range i s a reference only. Examination of s
with actual instrument is necessary.
　As Mn-Zn series has lower resistance compared to Ni-Zn series, make sure to provide
adequate insulation before use.
Characteristics and how to count turns
　Number of turns are counted by how many times the lead wire pa sses through the inner
hole of the core. Do not count the number of lead wire winding outside the core, as it results
　When desired performance can not be obtained just b y 1 turn, impedance characteristics
value can be raised b y increasing th e turn. In this case, the e frequency band should
be checked that it is in the desired range as adding turns resu lts in lowering down the
Tips on EMI Core Usages
（Represe ntative Example：ESD-R-16C）
Fig.1　How to count turns Fig.2　Relationship between impedance an d turn counts
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
hole of the core
= Turn count
Mn-Zn series vs Ni-Zn series ｜Z｜-f Characteristics (representative example)
(measurement condition: measured with same-dimension ring core)
Fig.3　te
AM band range FM band range
MnZn series core
NiZn series core
Impedance (Ω)
1000
100
10
1
0.01 0.1 1 10 100 1000
Impedance Increase
Resonance point changes to lower band
3T
2T
1T
Frequency (MHz)
Impedance (Ω)
Frequency (MHz)
10000
1 10 100 1000
1000
100
10
1
3T2T1T
Figure 3 – Effective band range of MnZn and NiZn ferrite core material.
(Representative example, measured with same-dimension ring core)
Turns and Impedance Characteristics
When the desired performance of an EMI core cannot
be obtained with a single pass through the core, the
impedance characteristics can be changed with multiple
turns.
A turn is counted by the number of lead-wire windings
which pass through the inner hole of the core. Windings
on the outside of the core do not count. See Figure 1 for
examples of one, two, and three turns.
Adding turns will result in higher impedance while also
lowering the effective frequency range. See Figure 2 for
an example.
Core Material and Effective Frequency Range
There are two ferrite material options for
KEMET EMI Cores: Nickel Zinc (NiZn) and
Manganese Zinc (MnZn). Each core material
has a different resistance and effective
frequency range. The MnZn core material
has a lower resistance compared to the NiZn;
therefore, adequate insulation is required
before use.
The NiZn core material is typically effective
for frequencies in the MHz band range such as
the FM-band, while the MnZn core material is
typically effective for the kHz band range such
as the AM-band. See Figure 3.
It is recommended to measure the actual
frequency range effectiveness in the target
application.
2© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5005_ESD-SR • 3/28/2017
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
Dimensions – Millimeters
ESD-SR
EMI Core
18
Snap-on Type
Snap-on Cores for Round
Cables
[RoHS Compliant]
Snap-on Cores for Round
Cables
[RoHS Compliant]
ESD-SR Series
Temperature Index : 65˚C Flame Class : UL94V-0
CTI : Rank 0
ESD-SR-100
1
10
100
1000
1 10010 1000
Impedance ()
Frequency (MHz)
ESD-SR-110
1
10
100
1000
1 10010 1000
Impedance ()
Frequency (MHz)
1T 1T
Impedance vs. Frequency
ESD–SR–
B
A
D
C
ESD–SR–S
D
AC
B
Shape and Dimensions
Case Color ESD-SR-□□□　（blank）Black
ESD-SR-□□□G　　　　　Gray
ESD-SR-□□□ V　　　　　Violet
※Black only for ESD-SR-S□□
ESD-SR-100 16.5 16.5 21.0 Up to 6.0 7.2 Black, Gray, Violet
ESD-SR-110 14.4 14.2 28.0 Up to 5.0 6.9 Black, Gray, Violet
ESD-SR-S10 15.5 14.0 18.5 Up to 6.0 4.1 Black
ESD-SR-120 16.0 16.4 33.0 Up to 6.0 13.3 Black, Gray, Violet
ESD-SR-150 19.6 20.3 37.4 Up to 7.0 23.4 Black, Gray, Violet
ESD-SR-160 20.2 20.0 39.0 Up to 9.0 22.7 Black, Gray, Violet
ESD-SR-250 31.5 31.6 38.0 Up to 13.0 59.5 Black, Gray, Violet
ESD-SR-S16 23.0 20.0 20.5 Up to 8.0 12.9 Black
ESD-SR-S25 33.0 29.0 15.5 Up to 14.5 21.3 Black
Model Dimensions (mm) φDWeight Color of case
A max. B max. C max. (g)
ESD-SR Series
The Violet case is built-to-order item.
See Table 1 for dimensions
Environmental Compliance
All KEMET EMI cores are RoHS Compliant.
Table 1 – Ratings & Part Number Reference
1 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.
ESD-SR-S
Part Number Dimensions (mm) Weight
(g) Case Color1
A Maximum B Maximum C Maximum ø D
ESD-SR-100
16.5
16.5
21.0
≤ 6.0
7.2
Black, Gray, Violet
ESD-SR-110
14.4
14.2
28.0
≤ 5.0
6.9
Black, Gray, Violet
ESD-SR-S10
15.5
14.0
18.5
≤ 6.0
4.1
Black
ESD-SR-120
16.0
16.4
33.0
≤ 6.0
13.3
Black, Gray, Violet
ESD-SR-150
19.6
20.3
37.4
≤ 7.0
23.4
Black, Gray, Violet
ESD-SR-160
20.2
20.0
39.0
≤ 9.0
22.7
Black, Gray, Violet
ESD-SR-250
31.5
31.6
38.0
≤ 13.0
59.5
Black, Gray, Violet
ESD-SR-S16
23.0
20.0
20.5
≤ 8.0
12.9
Black
ESD-SR-S25
33.0
29.0
15.5
≤ 14.5
21.3
Black
3© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5005_ESD-SR • 3/28/2017
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
Impedance vs. Frequency
1
10
100
1000
1 10010 1000
Impedance ()
1
10
100
1000
1 10010 1000
Impedance ()
1T 1T
1
10
100
1000
1 10010 1000
Impedance ()
1 10010 1000
Impedance ()
3T
2T
1T
1
10
100
10000
1000
1T
1
1 10010 1000
Impedance ()
1
1 10010 1000
Impedance ()
3T
2T
1T
3T
2T
1T
10
100
10000
1000
10
100
10000
1000
1
1 10010 1000
Impedance ()
1
1 10010 1000
Impedance ()
3T
2T
1T
3T
2T
1T
10
100
10000
1000
10
100
10000
1000
4© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5005_ESD-SR • 3/28/2017
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
Impedance vs. Frequency Cont’d
1
1 10010 1000
Impedance ()
Frequency (MHz)
3T
2T
1T
10
100
10000
1000
5© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5005_ESD-SR • 3/28/2017
EMI Cores – ESD-SR Series Snap-on Cores for Round Cables
KEMET Electronic Corporation Sales Of ces
For a complete list of our global sales offi ces, please visit www.kemet.com/sales.
Disclaimer
All product specifi cations, 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 specifi cally disclaims – any warranty concerning suitability for a specifi c 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.