EMI Cores
ESD-R-H Toroidal Cores for Round Cables for
Low & High Frequency & High Heat Resistance (with case)
Overview
Applications
The KEMET ESD-R-H Series solid toroidal cores feature
high heat resistance for round cables. KEMET’s unique
core material enables high performance in low frequency
range with the Manganese Zinc (MnZn) solution and in
high frequency range with the Nickel Zinc (NiZn) option. A
common value is also specifically designed with a cable
holding mechanism for round cable in higher
heat environment.
• Automotive inverters
• Automotive chargers
• Automotive DC/DC converters
• Consumer electronics
• Air conditioners
• Power conditioners
• Refrigerators
• Washing machines
• Industrial equipment
• General purpose inverters
• Robots
• Information and communication devices
• Medical equipment
• Audio-visual equipment
EMI cores are part of a family of passive components which
address the issues of noise or electromagnetic interference
(EMI) in circuits or systems.
Benefits
• Proprietary core material for high performnace in low and
high frequency range
• Solid construction
• Wider operating temperature range from −40°C to +120°C
• UL94 V–0 flame retardant rated case
• Cable holding mechanism for fixing cables with bands and
installation with two M4 screws
One world. One KEMET
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Part Number System
ESD-
R-
12
M-H
Series
Shape Type
Core Size
Outer Dimension Code (mm)
Core Material
ESD-
Ring
See Table 1
Turns and Impedance Characteristics
H / M-H = Mn-Zn
N-H = Ni-Zn
Figure 1 – How to count turns
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.
1T
Figure 2 – Relationship between impedance and turn count.
(Representative example: ESD-R-16C)
Resonance point changes to lower band
Core Material and Effective Frequency Range
1,000
100
10
1
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
MnZn core material has a lower resistance
compared to the Ni-Zn; therefore, adequate
insulation is required before use.
3T
Impedance Increase
Impedance (Ω)
See Figure 2 for an example.
It is recommended to measure the actual
frequency range effectiveness in the target
application.
3T
10,000
Adding turns will result in higher impedance while also lowering
the effective frequency range.
2T
1T
1
10
100
1,000
Frequency (MHz)
Figure 3 – Effective band range of Mn-Zn and Ni-Zn ferrite core material.
(Representative example, measured with same-dimension ring core)
1,000
AM band range
Impedance (Ω)
The Ni-Zn core material is typically effective
for 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.
2T
FM band range
Ni-Zn series core
100
Mn-Zn series core
10
1
0.01
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
0.1
1
10
100
1,000
Frequency (MHz)
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Magnetic Permeability of Ferrite Material
In order to achieve most efficient noise reduction, it is important to select the material according to the target frequency
band. Depending on its magnetic permeability, a particular ferrite material will be effective in a certain frequency band.
A schematic representation of the relationship between the magnetic permeability of each material and the corresponding
effective band range is shown in Figure 1. Materials with higher magnetic permeability are effective in the lower frequency
range, while those with lower magnetic permeability are effective in the higher frequency range. Thus, Mn-Zn products are
mainly used for reducing conduction noise, while Ni-Zn products are commonly used for radiation noise countermeasures.
The effective frequency range varies depending on core shape, size and number of windings. This frequency dependence
of the magnetic permeability as shown in the figure serves for reference purposes only and it should be tested on the actual
device to determine its effectiveness.
S18H, S15H, 10H, 7H, 5H, 1400L and 700L are KEMET’s proprietary ferrite material names.
Other materials can also be available on request.
Figure 4 - Relationship between the magnetic permeability of each material and its effective frequency range
20,000
Higher magnetic permeability:
Higher noise suppression effect
in the lower frequency range
Mn-Zn Series
Magnetic Permeability
S18H
S15H
10H
10,000
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
7H
5H
Ni-Zn Series
0
10 kHz
1400L
700L
100 kHz
1 MHz
10 MHz
100 MHz
1 GHz
Effective Frequency Range
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Environmental Compliance
All KEMET EMI cores are RoHS compliant.
Dimensions – Millimeters
Case Type
ID
T
OD
See Table 1 for dimensions
Cable Holding Mechanism Case Type (ESD-R-47H)
6.5
28.5 Maximum
3.0
18.5 Maximum
16.5 10
20
52.5
83
Ø22.7
5.2 ±0.2
6.5
ESD-R-47H
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Installation Example
Case Type
Cable Holding Mechanism
Case Type (ESD-R-47H)
Performance Characteristics
Item
Performance Characteristics
Operating temperature
Frequency range
Outer diameter
Inner diameter
Thickness
Type
Case flame resistant rating
Material
−40°C to +120°C
Low frequency and high frequency
15.0 – 61.0 mm
5.0 – 33.2 mm
9.0 – 25.0 mm
Case
UL94 V–0
MnZn 5H, MnZn 10H and NiZn 700L
Table 1 – Ratings & Part Number Reference
Part
Number
Weight
Case Compatible
Toroid Core
Color (Bare Type)
OD
ID
T
Maximum
(g)
ESD-R-12M-H
ESD-R-12N-H
ESD-R-19M-H
ESD-R-19N-H
ESD-R-25M-H
ESD-R-25N-H
ESD-R-38M-H
ESD-R-38N-H
ESD-R-47M-H
ESD-R-47N-H
ESD-R-57M-H
ESD-R-57N-H
15.0 Maximum
15.0 Maximum
22.0 Maximum
22.0 Maximum
29.0 Maximum
29.0 Maximum
42.0 Maximum
42.0 Maximum
51.0 Maximum
51.0 Maximum
61.0 Maximum
61.0 Maximum
5.0 ±1.0
5.0 ±1.0
7.7 ±1.0
7.7 ±1.0
12.7 ±1.0
12.7 ±1.0
16.7 ±1.0
16.7 ±1.0
24.4 ±1.0
24.4 ±1.0
33.2 ±1.0
33.2 ±1.0
9.0
9.0
14.0
14.0
16.0
16.0
17.0
17.0
19.0
19.0
25.0
25.0
2.6
2.6
11.8
11.8
21.8
21.8
56.0
56.0
91.5
91.5
152.0
152.0
White
Black
White
Black
White
Black
White
Black
White
Black
White
Black
—
ESD-R-12S
ESD-R-19S
ESD-R-19SD
ESD-R-25S
ESD-R-25SD
ESD-R-38D
—
ESD-R-47S
—
ESD-R-57S
—
ESD-R-47H
52.5 ±0.7
22.7 ±0.7
18.5
107.0
White
—
OD
ID
T
(g)
Part
Number
1
Dimensions (mm)
Dimensions
Weight
Color
Compatible
Toroid Core
(Bare Type)
Frequency Range1
Material
≤ 10 MHz
≤ 300 MHz
MnZN NiZn
(AM band range) (FM band range)
X
X
X
X
X
X
X
X
X
X
X
X
X
≤ 10 MHz
(AM band range)
≤ 300 MHz
(FM band range)
Frequency Range1
5H
—
5H
—
5H
—
5H
—
5H
—
5H
—
—
700L
—
700L
—
700L
—
700L
—
700L
—
700L
10H
—
MnZn
NiZn
Material
Frequency range is for reference only. Please test with actual device before use.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Impedance vs. Frequency
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Impedance vs. Frequency cont.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Impedance vs. Frequency cont.
Packaging
Part Number
ESD-R-12M-H
ESD-R-12N-H
ESD-R-19M-H
ESD-R-19N-H
ESD-R-25M-H
ESD-R-25N-H
ESD-R-38M-H
ESD-R-38N-H
ESD-R-47M-H
ESD-R-47N-H
ESD-R-57M-H
ESD-R-57N-H
ESD-R-47H
Packaging Type
Pieces per Box
2,000
480
300
Tray
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
200
100
60
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
Handling Precautions
EMI Cores should be stored in normal working environments. While the EMI Cores themselves are quite robust in other
environments, avoid exposure to high temperatures, high humidity, corrosive atmospheres and long term storage for case,
snap-on and split types.
KEMET recommends that maximum storage temperature not exceed 40°C and maximum storage humidity not exceed 75%
relative humidity. Atmospheres should be free of chlorine, sulfur and alkali bearing compounds. Avoid also storage near
strong magnetic fields as this might magnetize the product.
Temperature fluctuations should be minimized to avoid condensation or cracks on the parts. Mechanical shocks can bring
to cracks as well.
Export Control
For customers in Japan
For products that are controlled items subject to the “Foreign Exchange and Foreign Trade Law” of Japan, the export license
specified by the law is required for export.
For customers outside Japan
EMI Core products should not be used or sold for use in the development, production, stockpiling or utilization of any
conventional weapons or mass-destructive weapons (nuclear weapons, chemical or biological weapons, or missiles), or any
other weapons.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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EMI Core – ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case)
KEMET Electronics Corporation Sales Offices
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.
When providing KEMET products and technologies contained herein to other countries, the customer must abide by the procedures and provisions stipulated in all
applicable export laws and regulations, including without limitation the International Traffi c in Arms Regulations (ITAR), the US Export Administration Regulations
(EAR) and the Japan Foreign Exchange and Foreign Trade Act.
KEMET is a registered trademark of KEMET Electronics Corporation.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5003_ESD-R-H • 3/30/2020
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