1© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5006_ESD-SR-H • 3/28/2017
One world. One KEMET
EMI Core
ESD-SR-H/HL Series Snap-on Cores for Round Cables
with High Heat Resistance and Cable Holding Mechanism
Overview
The KEMET ESD-SR-H/HL Series
snap-on cores feature high heat
resistance and a cable holding
mechanism designed specically for
round cable. KEMET’s unique core
material enables high performance in
low frequency range.
Benets
• Wider operational temperature
range, applicable to automotive
environment: -40°C to +125°C
• Cable holding mechanisms provided
(xing of cables / enclosures with
xing bands possible)
• Unique core material enables high
performance in low frequency range
• Snap-on convenience
• Split construction
Applications
• Automotive (ESP, etc.)
• Information and communication
devices
• Audio-visual equipment
• Consumer electronics
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 (Ni-Zn) and Manganese-
Zinc (Mn-Zn). Each core material has a different
resistance and effective frequency range. The Mn-
Zn core material has lower resistance compared to
the Ni-Zn; therefore, be sure to provide adequate
insulation before use.
For reference, the Ni-Zn core material is typically
effective for the frequencies in the MHz band
range such as the FM-band, while the Mn-Zn core
material is typically effective for the kHz band
range such as the AM-band. See Figure 3.
It is recommended to verify actual effectiveness in
the target application with measurements.
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 Mn-Zn and Ni-Zn ferrite core material.
(Representative example, measured with same-dimension ring core)
2© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5006_ESD-SR-H • 3/28/2017
EMI Core – ESD-SR-H/HL Series Snap-on Cores for Round Cables with High Heat Resistance and Cable Holding Mechanism
Dimensions – Millimeters
See Table 1 for dimensions
Environmental Compliance
All KEMET EMI cores are RoHS Compliant.
RoHS Compliant
Table 1 – Ratings & Part Number Reference
(1) To complete KEMET part number, insert H for -40°C to +100°C type, or HL for -40°C to +125°C type.
Part Number Dimensions (mm) Weight
(g) Case Color
A ø B C D E
ESD-SR-160(1)
19.5
~ 9
19.5
46.5
38.5
23
Black
ESD-SR-250(1)
30
~ 13
30
53
42
63
Black
EMI Core
7
EMI Cores
Ring Type
Dimensions（mm）
Model
ESD-SR-160H
ESD-SR-250H
A
19.5
30
C
19.5
30
D
46.5
53
E
38.5
42
Weight(g)
23
63
Color of case
black
black
φB
～9
～13
Snap-on Cores for Round Cables with High Heat
Resistance and Cable Holding Mechanism
ESD-SR-H Series
[RoHS Compliant]
Snap-on Cores for Round Cables with High Heat
Resistance and Cable Holding Mechanism
ESD-SR-H Series
[RoHS Compliant]
Snap-on Cores for Round Cables with High Heat
Resistance and Cable Holding Mechanism
ESD-SR-H Series
[RoHS Compliant]
Shape and DimensionsImpedance vs. Frequency
[mm]
D
E
A
B
C
1
1000
100
10
1 10 100 1000
Impedance ()
Frequency (MHz)
ESD-SR-H
ESD-SR-160H
ESD-SR-250H
①Wider operational temperature range.
　Applicable to automotive environment (-40℃～+125 ℃)
②Holding mechanisms provided
　(Fixing of cables / enclosures with fixing bands possible)
③
Our unique core material enables high performance in high frequency range
●Automotive (ESP, etc.)
●Information and communication devices,
　
audio-visual equipment, consumer electronics
Features Applications
3© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5006_ESD-SR-H • 3/28/2017
EMI Core – ESD-SR-H/HL Series Snap-on Cores for Round Cables with High Heat Resistance and Cable Holding Mechanism
Impedance vs. Frequency
1
1000
100
10
1 10 100 1000
Impedance ()
Frequency (MHz)
ESD-SR-H/HL
ESD-SR-160H
ESD-SR-250H
ESD-SR-250HL
ESD-SR-160HL
4© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com E5006_ESD-SR-H • 3/28/2017
EMI Core – ESD-SR-H/HL Series Snap-on Cores for Round Cables with High Heat Resistance and Cable Holding Mechanism
KEMET Electronic Corporation Sales Of ces
For a complete list of our global sales of ces, please visit www.kemet.com/sales.
Disclaimer
All product speci 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 speci cally disclaims – any warranty concerning suitability for a speci 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.