B-20 Series Bead Cores

EMI Cores
B-20 Series Bead Cores
Overview
Benefits
Applications
KEMET B-20 Series bead cores are
designed for use on round cable. The
wide range of Manganese Zinc (MnZn)
and Nickel Zinc (NiZn) options allows for
targeting of specific frequency ranges.
EMI cores are part of a family of passive
components which address the issues
of noise or electromagnetic interference
(EMI) in circuits or systems.
• MnZn ≤ 100 MHz (AM band range)
• Consumer electronics
and NiZn ≤ 300 MHz (FM band
range)
Tips on
EMI Core Usages
options
available
EMI Cores
•Ring
Solid
construction
Type
EMI Cores
Ring Type
Characteristics and how to count turns
Number of turns are counted by how many times the lead wire
Tips on EMI Core Usages
hole of the core. Do not count the number of lead wire winding
Characteristics and how to count turns
When desired performance can not be obtained just b
Number of turns are counted by how many times the lead wire pa
sses through the inner
canofbe
raised
b
y increasing th
e the
turn.
In as
this
case, the
hole of the core. Do not count thevalue
number
lead
wire winding
outside
core,
it results
EMI Cores
be checked that it is in the desired range as adding turns resu
y increasing th
y 1 turn, impedance characteristics
e frequency band should
（Rep
e turn. In this case, the
Figure 1range
– How
count turns
turns resu
be checked that it is in the desired
asto
adding
When the desired performance of an EMI core cannot be
Characteristics and how to count turns
obtained with a single pass through the core,
the impedance
Number of turns are counted by how many times the lead wire pa
characteristics can be changed with multiple
turns.
hole of the core. Do not count the number of lead wire winding
Impedance (Ω)
10000
10000
lts in lowering
down the
（Represe ntative Example：ESD-R-16C）
1000
sses through the inner
outside the core, as it results
1000
3T
Resonance point changes to lower
A turn is counted by the number of lead-wire
windings
which
When
desired
performance can not be obtained just b
y 1 turn, impedance characteristics
2T
1T
2T
3T
100
e frequency band should
value
can
be
raised
b
y
increasing
th
e
turn.
In
this
case,
the
pass through the inner hole of the core. Windings on the
1T
that it is in the desired range as adding turns resu
lts in lowering down the
outside of the core do not count. See Figurebe1checked
for examples
1T
2T
Figure
23T– Relationship
between
impedance
and turn count.
10
*Number
of lead wire wound
outside
the
core + 1
= Number of read
wire passes
through the inner
(Representative
example:
ESD-R-16C)
of one, two, and three turns.
hole
of the core ntative Example：ESD-R-16C）
（Represe
10
1
1
Frequency (MHz)
3T
Impedance Increase
1000
Fig.1　How to count turns
Fig.2　Relationship between impedance an
d turn count
2T
There are two materials of ferrite, Ni-Zn series and Mn-Zn ser
100
1T
There are two materials of ferrite, Ni-Zn series and Mn-Zn ser
2T
3T
10
Core Material and Effective Frequency Range
1T
100
*Number of lead wire wound outside the core + 1
1
10000
= Turn count
= Number of read wire passes through the inner
1
10 changes to lower band100
1000
Resonance point
hole of the core
= Turn count
Fig.1　How to count turns
Fig.2　Relationship b
Impedance (Ω)
Adding turns will result in higher impedance while also
lowering the effective frequency range. See Figure 2 for an
example.
Impedance Increase
value can be raised b
Impedance (Ω)
Turns and Impedance Characteristics
Tips on EMI Core Usages
When desired performance can not be obtained just b
Impedance Increase
Ring Type
*Number of lead wire wound　Note
outside thethat
core +above
1
= Number of read wire passes through the inner
with actual instrument
hole of the core
= Turn count
Note that above
e band range
i
1
ies. Ni-Zn series is
e
ive for kHz band range.
e band range i
s a reference only. Examination of
s a reference
s
with actual instrument
is necessary.
10
100
is necessary. 1
1000
There are two ferrite material options for KEMET
As Mn-Zn
series
lower
resistance compared
to Ni-Zn
seri
Frequency
(MHz)
As Mn-Zn series has lower resistance
compared
tohas
Ni-Zn
series,
make sure
to provide
EMI Cores: Nickel Zinc (NiZn) and Manganese
adequate between
insulation
before
Fig.1　How to adequate
count turns insulation before use.
Fig.2　Relationship
impedance
an use.
d turn counts
Zinc (MnZn). Each core material has a different
Figure 3 – Effective band range of MnZn and NiZn ferrite core material.
Mn-Zn series vs Ni-Zn series
｜Z｜-f Characteristics
(representative
example)
Mn-Zn
series
vs Ni-Zn
series ring core)
｜Z｜-f Characteristics (r
resistance and effective frequency range. The MnZn
(Representative example, measured
with same-dimension
condition:
ring core)
There are two materials of ferrite, Ni-Zn(measurement
series and Mn-Zn
sermeasured with same-dimension
ies.
Ni-Zn
series
is
e
(measurement condition: measured
with same-dimensi
1000
core material has a lower resistance compared to
ive for kHz band range.
1000
the NiZn; therefore, adequate insulation is required
e band range i
s a reference only. Examination of
s
Note that above
with actual instrument is necessary.
before use.
AM band range
FM band range
As Mn-Zn series has lower resistance compared to Ni-Zn series,
make
AM
bandsure
rangeto provide
NiZn series core
The NiZn core material is typically
100
｜Z｜-fMnZn
Characteristics
(representative example)
frequencies in the MHz band range such as the Mn-Zn series vs Ni-Zn series
series core
(measurement condition: measured with same-dimension ring core)
FM-band, while the MnZn core material is typically1000
MnZn series core
10
effective for the kHz band range such as the AMband. See Figure 3.
10 FM band range
AM band range
Impedance (Ω)
It is recommended to measure the actual frequency100
range effectiveness in the target application.
10
NiZn series core
1
0.01
MnZn series core
0.1
Fig.3　1
10
100
1000
Frequency (MHz)
1
0.1
One
te
1KEMET
10
world. One
Frequency1 (MHz)
E5009_B-20 • 3/25/2015
0.01
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
Fig.3　1
NiZn ser
Impedance (Ω)
Impedance (Ω)
effectiveadequate
for insulation before use. 100
EMI
9.7
B-20L-95B
4.8
4.2
(coated)
●
ove frequency range is a reference only. Please test with actual device before use.
EMI Cores – B-20 Series Bead Cores
hape and Dimensions
Dimensions – Millimeters
ID
Beads Cores
OD
H
See Table 1 for dimensions
Environmental Compliance
All KEMET EMI cores are RoHS Compliant.
Table 1 – Ratings & Part Number Reference
mpedance vs. Frequency
1
2
Part Number
B-20F-28
B-20F-28
B-20F-38
B-20F-46
B-20F-57
B-20L-25
B-20L-34
B-20L-44
B-20L-48B
B-20L-95B2
1000
100
10
OD
ID
2.8
3.8
4.6
5.7
2.5
3.4
4.4
4.8
9.7
1.3
1.5
1.5
1.5
1.0
0.8
1.6
2.4
4.8
Frequency range is for reference only. Please test with actual device before use.
Coated
1
1
10
100
Frequency (MHz)
1000
Frequency Range1
1000
Impedance ()
Impedance ()
10000
Dimensions (mm)
B-20F-38
H
3.0
4.3
4.3
8.0
1.2
4.4
7.0
4.8
4.2
100
10
1
≤ 100 MHz
(AM band range)
1
X
X
X
X
10
≤ 300 MHz
(FM band range)
X
X
X
X
X
100
Frequency (MHz)
1000
Core
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5009_B-20 • 3/25/2015
2
EMI Cores – B-20 Series Bead Cores
Impedance vs. Frequency
Impedance vs. Frequency
B-20F-28
1000
1000
Impedance ()
Impedance ()
10000
100
10
EMI Cores
Bead
Type1 1
10
100
Frequency (MHz)
Ring Type
B-20F-38
100
10
1
1000
1
10
100
Frequency (MHz)
1000
EMI Cores
Bead
Type
Impedance
Ring
Type vs. Frequency
EMI
Core
B-20F-46
28
EMI Cores
Bead
Type
1000
1000
100
1
ImpedanceImpedance
()
Impedance
()
()
Impedance vs. Frequency
1000
100
10
100
10
1
10
1
1000
1000
100
10
100
10
1
10
1000
1
1000
100
10
100
10
1
10
1
1000
1
1000
100
1000
100
10
100
10
1
B-20F-46
1
1000
100
10
10
100
1000
10
100
1000
10
100
1000
Frequency (MHz)
B-20L-25
1
Frequency (MHz)
B-20L-25
1
Frequency (MHz)
B-20L-25
1
10
100
1000
10
100
1000
10
100
1000
Frequency (MHz)
B-20L-44
1
Frequency (MHz)
B-20L-44
1
Frequency (MHz)
B-20L-44
1
10
100
1000
10
100
1000
10
100
1000
1
10
100
1000
1
10
100
1000
Frequency (MHz)
B-20L-95B
1
Frequency (MHz)
B-20L-95B
1
Frequency (MHz)
100
10
1
10
1000
1
ImpedanceImpedance
()
Impedance
()
()
ImpedanceImpedance
()
Impedance
()
()
1
1000
100
1000
100
1000
100
1
ImpedanceImpedance
()
Impedance
()
()
ImpedanceImpedance
()
Impedance
()
()
1000
100
ImpedanceImpedance
()
Impedance
()
()
Impedance
Ring
Type vs. Frequency
B-20F-46
ImpedanceImpedance
()
Impedance
()
()
1000
1000
100
1
1000
100
10
100
10
1
10
1000
1
1000
100
10
100
10
1
10
1
1
B-20F-57
B-20F-57
B-20F-57
1
10
100
1000
10
100
1000
10
100
1000
10
100
1000
10
100
1000
10
100
1000
1
10
100
1000
1
10
100
1000
1
10
100
1000
Frequency (MHz)
B-20L-34
1
Frequency (MHz)
B-20L-34
1
Frequency (MHz)
B-20L-34
1
Frequency (MHz)
B-20L-48B
1
Frequency (MHz)
B-20L-48B
1
Frequency (MHz)
B-20L-48B
Frequency (MHz)
Frequency (MHz)
Frequency (MHz)
B-20L-95B
(MHz)
© KEMET Electronics Corporation • P.O. Box Frequency
5928 • Greenville,
SC 29606 (864) 963-6300 • www.kemet.com
10
1
Frequency (MHz)
E5009_B-20 • 3/25/2015
3
Impedance ()
Impedance ()
100
10 Cores
EMI Cores – B-20 Series Bead
Impedance vs. Frequency Cont’d
1
Impedance ()
1000
1
10
100
1000
10
100
1000
Frequency (MHz)
100
10
1
1
10
100
Frequency (MHz)
1000
B-20L-95B
100
10
1
1
Frequency (MHz)
EMI Core
29
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5009_B-20 • 3/25/2015
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EMI Cores – B-20 Series Bead Cores
KEMET Corporation
World Headquarters
Europe
Asia
Southern Europe
Sasso Marconi, Italy
Tel: 39-051-939111
Northeast Asia
Hong Kong
Tel: 852-2305-1168
Mailing Address:
P.O. Box 5928
Greenville, SC 29606
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Tel: 389-2-55-14-623
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Tel: 86-755-2518-1306
www.kemet.com
Tel: 864-963-6300
Fax: 864-963-6521
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Landsberg, Germany
Tel: 49-8191-3350800
Corporate Offices
Fort Lauderdale, FL
Tel: 954-766-2800
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Tel: 49-2307-438110
North America
Northern Europe
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Tel: 44-1279-460122
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Tel: 886-2-27528585
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Tel: 358-9-5406-5000
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2835 KEMET Way
Simpsonville, SC 29681
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Tel: 52-33-3123-2141
Note: KEMET reserves the right to modify minor details of internal and external construction at any time in the interest of product improvement. KEMET does not
assume any responsibility for infringement that might result from the use of KEMET Capacitors in potential circuit designs. KEMET is a registered trademark of
KEMET Electronics Corporation.
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5009_B-20 • 3/25/2015
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EMI Cores – B-20 Series Bead Cores
Disclaimer
This product has been made available through a Private Label Agreement and a Development and Cross-Licensing Agreement between KEMET and NEC TOKIN to expand market
and product offerings for both companies and their respective customers. For more information, please visit http://www.kemet.com/nectokin.
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.
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
E5009_B-20 • 3/25/2015
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