EMI Cores
ESD-R-SR Toroidal Cores for Round Cables for
Low Frequency at 150 kHz (Bare, coated & with case)
Overview
Applications
The KEMET ESD-R-SR Series solid toroidal cores are
designed for use on round cables. KEMET’s unique core
material enables high performance in low frequency
range, at 150 kHz. Options are available in bare, coated
and with case types. EMI cores are part of a family of
passive components which address the issues of noise or
electromagnetic interference (EMI) in circuits or systems
• Consumer electronics
• Air conditioners
• Power conditioners
• Refrigerators
• Washing machines
• Business multifunction printers
• Industrial equipment
• General purpose inverters
Benefits
• Proprietary high impedance core material for effective
noise suppression at 150kHz
• Solid construction
• Large-size ring type
• Bare, coated and with case types available
Part Number System
ESD-
R-
31
SR
-P
Series
Shape Type
Core Size
Outer Dimension Code (mm)
Core Material
Type
ESD-
Ring
See Table 1
SR = S15H
SRH = S18H
Blank = Bare
P = Coated
One world. One KEMET
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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EMI Core – ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
Turns and Impedance Characteristics
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.
1T
Adding turns will result in higher impedance while also lowering
the effective frequency range.
10,000
Core Material and Effective Frequency Range
1,000
100
10
1
3T
Impedance Increase
Impedance (Ω)
Resonance point changes to lower band
See Figure 2 for an example.
2T
1T
1
10
100
1,000
Frequency (MHz)
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.
It is recommended to measure the actual
frequency range effectiveness in the target
application.
3T
Figure 2 – Relationship between impedance and turn count.
(Representative example: ESD-R-16C)
See Figure 1 for examples of one, two, and three turns.
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
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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-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & 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
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EMI Core – ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
Environmental Compliance
All KEMET EMI cores are RoHS compliant.
Dimensions – Millimeters
OD
ID
T
See Table 1 for dimensions
Installation Example
© 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-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
Performance Characteristics
Item
Performance Characteristics
Operating temperature
Frequency range
Outer diameter
Inner diameter
Thickness
Type
Case flame resistant rating
Material
−25°C to +85°C
Low frequency
31.0 – 59.0 mm
19.0 – 36.0 mm
12.7 – 21.0 mm
Bare, coated, and case
UL94 V–2
MnZn S15H
Table 1 – Ratings & Part Number Reference
Part
Number
1
Dimensions (mm)
Weight
Type
Color
Compatible
Toroid Core
(Bare Type)
32.5
52.5
83.4
139.5
Bare
Bare
Bare
Bare
—
—
—
—
—
—
—
—
16.0 Maximum
14.0 Maximum
16.0 Maximum
21.0 Maximum
32.9
53.3
84.3
141.5
Coated
Coated
Coated
Coated
Gray
Gray
Gray
Gray
19.0 Maximum
92.0
Case
White with blue tape
OD
ID
T
(g)
ESD-R-31SR
ESD-R-38SR
ESD-R-47SR
ESD-R-57SR
31.0 ±0.8
38.0 ±0.8
47.0 ±1.0
57.0 ±1.5
20.0 ±0.8
19.0 ±0.8
27.0 ±0.8
36.0 ±1.0
14.9 ±0.5
12.7 ±0.5
15.0 ±0.5
20.0 ±0.5
ESD-R-31SR-P
ESD-R-38SR-P
ESD-R-47SR-P
ESD-R-57SR-P
32.0 Maximum
39.5 Maximum
48.5 Maximum
59.0 Maximum
19.0 Minimum
18.0 Minimum
26.0 Minimum
34.0 Minimum
ESD-R-47SRH
51.0 Maximum
24.4 ±1.0
Frequency Range1
≤ 10 MHz
≤ 300 MHz
(AM band range) (FM band range)
Material
MnZN
NiZn
X
X
X
X
S15H
S15H
S15H
S15H
—
—
—
—
—
—
—
—
X
X
X
X
S15H
S15H
S15H
S15H
—
—
—
—
—
X
S18H
—
Frequency range is for reference only. Please test with actual device before use.
Impedance vs. Frequency
Bare Type
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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EMI Core – ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
Impedance vs. Frequency cont.
Bare Type
Coated Type
© 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-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
Impedance vs. Frequency cont.
Case Type
Packaging
Part Number
ESD-R-31SR
ESD-R-38SR
ESD-R-47SR
ESD-R-57SR
ESD-R-31SR-P
ESD-R-38SR-P
ESD-R-47SR-P
ESD-R-57SR-P
ESD-R-47SRH
Packaging Type
Pieces per Box
Tray
300
200
100
60
300
200
100
60
100
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EMI Core – ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & 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
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EMI Core – ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case)
KEMET Electronics Corporation Sales Offices
For a complete list of our global sales offices, please visit www.kemet.com/sales.
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.
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 Traffic 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
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