EMI Cores
ESD-SR-H/HL Snap-on Cores for Round Cables for
High Frequency (with High Heat Resistance & Cable
Holding Mechanism case)
Overview
The KEMET ESD-SR-H/HL Series snap-on toroidal
cores feature high heat resistance and a cable holding
mechanism designed specifically for round cables.
KEMET’s unique core material enables high performance in
high frequency range.
EMI cores are part of a family of passive components which
address the issues of noise or electromagnetic interference
(EMI) in circuits or systems.
Applications
•
•
•
•
•
•
•
Automotive inverters
Automotive chargers
Automotive DC/DC converters
LED head lights
Information and communication devices
Audio-visual equipment
Consumer electronics
Benefits
• Proprietary core material for high performance in high
frequency range
• Split construction
• Easy to install through its snap-on mecanism
• Quick solution for post-cable assembly noise issue
• Wider operating temperature range from −40°C to +100°C
for H type and −40°C to +125°C for HL type
(ideal for automotive environment)
• Cable holding mechanism for fixing cables with bands
• UL94 V–0 flame retardant rated case
• AEC–Q200 (HL type)
Part Number System
ESD-
Series
ESD-
SR-
Form Type
Snap-on
160
Core Size
Outer Dimension Code (mm)
See Table 1
H
Case Type
High heat resistance
H = −40°C to 100°C
HL = −40°C to 125°C
Built Into Tomorrow
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5006_ESD-SR-H • 11/22/2021
1
EMI Core – ESD-SR-H/HL Snap-on Cores for Round Cables for High Frequency
(with High Heat Resistance & Cable Holding Mechanism case)
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.
Figure 1 – How to count turns
1T
2T
3T
Figure 2 – Relationship between impedance and turn count.
(Representative example: ESD-R-16C)
10,000
Resonance point changes to lower band
Impedance (Ω)
Impedance Increase
1,000
3T
2T
1T
100
10
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
MnZn core material has a lower resistance
compared to the Ni-Zn; therefore, adequate
insulation is required before use.
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.
It is recommended to measure the actual
frequency range effectiveness in the target
application.
Impedance (Ω)
1
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
100
FM band range
Ni-Zn series core
Mn-Zn series core
10
1
0.01
0.1
1
10
100
1,000
Frequency (MHz)
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5006_ESD-SR-H • 11/22/2021
2
EMI Core – ESD-SR-H/HL Snap-on Cores for Round Cables for High Frequency
(with High Heat Resistance & Cable Holding Mechanism case)
Magnetic Permeability of Ferrite Material
In order to achieve 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 or metal 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 4.
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. Metal materials, however, are effective
throughout the broadband frequency range, in low as well as high frequencies.
The effective frequency range varies depending on core shape, size, and number of turns. This frequency dependence of the
magnetic permeability as shown in the figure serves for reference purposes only. It should be tested on the actual device to
determine its effectiveness.
S18H, S15H, 10H, 7H, 7HT, 5H, 5HT, 1400L, and 700L are KEMET’s proprietary ferrite material names. Other materials are
available upon request.
Figure 4 - Relationship between the magnetic permeability of each material and its effective frequency range
Higher magnetic permeability:
Higher noise suppression effect in the broadband frequency range
Nanocrystalline Core
20,000
Magnetic Permeability
Mn-Zn Series
S18H
S15H
Higher magnetic permeability:
Higher noise suppression effect
in the lower frequency range
10,000
10H
7H, 7HT
5H, 5HT
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
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
E5006_ESD-SR-H • 11/22/2021
3
EMI Core – ESD-SR-H/HL Snap-on Cores for Round Cables for High Frequency
(with High Heat Resistance & Cable Holding Mechanism case)
Environmental Compliance
All KEMET EMI cores are RoHS compliant.
Dimensions – Millimeters
D
E
A
B
C
ESD-SR-HL series are indicated by a white dot printing on the case.
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
E5006_ESD-SR-H • 11/22/2021
4
EMI Core – ESD-SR-H/HL Snap-on Cores for Round Cables for High Frequency
(with High Heat Resistance & Cable Holding Mechanism case)
Performance Characteristics
Item
Operating Temperature
Frequency Range
Outer Diameter
Inner Diameter
Length
Type
Case Flame Resistant Rating
Material
Performance Characteristics
H : −40°C to +100°C
HL: −40°C to +125°C
High frequency
19.5 – 30.0 mm
9.0 – 13.0 mm
46.5 – 53.0 mm
Case
UL94 V–0
NiZn 700L and NiZn 1400L
Table 1 – Ratings & Part Number Reference
Part
Number
ESD-SR-160H
ESD-SR-160HL
ESD-SR-250H
ESD-SR-250HL
1
Dimensions (mm)
A
19.5 ±1.0
19.5 ±1.0
30.0 ±1.0
30.0 ±1.0
Weight
D
46.5 ±1.0
46.5 ±1.0
53.0 ±1.0
53.0 ±1.0
B
ø 9.0 ±1.0
ø 9.0 ±1.0
ø 13.0 ±1.0
ø 13.0 ±1.0
C
19.5 ±1.0
19.5 ±1.0
30.0 ±1.0
30.0 ±1.0
E
38.5 ±1.0
38.5 ±1.0
42.0 ±1.0
42.0 ±1.0
(g)
23
23
63
63
Case
Color
Black
Black
Black
Black
Frequency
Range
1
≤ 300 MHz
(FM band range)
X
X
X
X
Material
MnZN
–
–
–
–
NiZn
1400L
700L
1400L
700L
Frequency range is for reference only. Please test with actual device before use.
Impedance vs. Frequency
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
E5006_ESD-SR-H • 11/22/2021
5
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