●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9634ESDVOL09E1003E1
Contents
Introduction of EMI Core
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½4
Tips on EMI Core Usages
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½5
New Product
Toroidal Cores for Round Cables with High Heat Resistance
and Cable Holding Mechanism ESD-R-H Series
½½½½½½½½½½½½6
Snap-on Cores for Round Cables with High Heat Resistance
and Cable Holding Mechanism ESD-SR-H Series
½½½½½½½½½½½7
Ring Type
Toroidal Cores (Bare Type)
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½8
Toroidal Cores (Coated Type)
½½½½½½½½½½½½½½½½½½½½½½½½½½½12
Toroidal Cores with Case
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½14
Toroidal Cores with Snail-shaped Case½½½½½½½½½½½½½½½½½½½16
Snap-on Type
Snap-on Cores for Round Cables
½½½½½½½½½½½½½½½½½½½½½½½½½½½18
Flat Type
Solid / Split Cores for Flat Cables
½½½½½½½½½½½½½½½½½½½½½½½½20
Bead Type
Bead Cores
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½28
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9634ESDVOL09E1003E1
EMI Core
Vol.09
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9634ESDVOL09E1003E1
EMI Cores
Ring Type
Introduction of EMI Core
Material Outer Diameter Inner Diameter
（㎜）
（㎜）
Mn-Zn
& Ni-Zn
Mn-Zn
& Ni-Zn
Mn-Zn
& Ni-Zn
Mn-Zn
& Ni-Zn
Mn-Zn
Height
（㎜）
Series Name
Shape
Model
Page
for Round Cables
Bare type
Toroidal Cores
(Bare Type)
Toroidal Cores
(Coated Type)
Toroidal Cores
with Case
Toroidal Cores
with Snail-shaped Case
Toroidal Cores
(ESD-R-H series)
ESD-R
9.5∼38.1
5.0∼19.0
3.0∼28.5
8
Coated type
ESD-R
12.0∼32.0
6.2∼19.0
3.0∼28.8
12
with Case
ESD-R
12.9∼61.0
6.0∼32.4
6.4∼24.0
14
Solid
with Snail-shaped Case
with High Heat Resistance and
Cable Holding Mechanism
ESD-R-B
21.5∼51.5
8.8∼25.5 13.0∼17.5
16
ESD-R-H
52.5
22.7
8.5
6
for Flat Cables
Bare type
Solid Core
for Flat Cables
ESD-FPL
Ni-Zn
14.5∼80.0
0.55∼2.2
2.75∼12.0
20
for Round Cables
with Case
with High Heat Resistance and
Cable Holding Mechanism
Snap-on Core
for Round Cables
(ESD-SR series)
Snap-on Core
for Round Cables
(ESD-SR-H series)
ESD-SR
Ni-Zn
−
φ6∼φ14.5
−
18
ESD-SR-H
Ni-Zn
−
φ9∼φ13
−
7
Split
for Flat Cables
with Metal Clamp
Split Core
for Flat Cables
Split Core
for Flat Cables
ESD-FPD
Ni-Zn
37.0∼80.0
2.0∼2.6
10
21
with Plastic
ESD-FPD-1
Ni-Zn
37.0∼80.0
2.0∼2.6
10
21
Beads
Single Piece Core
Beads Core
B-20
Mn-Zn
& Ni-Zn
2.8∼9.7
0.8∼4.8
1.2∼8.0
28
Case by case product guide
●When
you have worry about damages to cable covering and insulation.
Coated Type Core, Core with Case ...................................................
page 12∼15
●When
you want to retrofit the core
Hinged-Clamp Core
・For Round Cable: ESD-SR, ESD-SR-H series ..............................
・For Flat Cable: ESD-FPD series ......................................................
page 18∼19
page 21
●When
you want to fix the core
Core with Snail Shaped Case
・For Round Cable: ESD-R-B, ESD-R-H series ................................
・For Flat Cable: ESD-FPD-1 series ..................................................
page 16∼17
page 21
EMI Core
4
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9634ESDVOL09E1003E1
EMI Cores
Ring Type
Tips on EMI Core Usages
■Characteristics and how to count turns
Number of turns are counted by how many times the lead wire passes through the inner
hole of the core. Do not count the number of lead wire winding outside the core, as it results
in different turn count. (Fig. 1)
When desired performance can not be obtained just by 1 turn, impedance characteristics
value can be raised by increasing the turn. In this case, the effective frequency band should
be checked that it is in the desired range as adding turns results in lowering down the
effective band range. (Fig. 2)
（Representative Example：ESD-R-16C）
10000
Resonance point changes to lower band
Impedance increase
1000
Impedance ( )
3T
2T
1T
100
1Ｔ
2Ｔ
3Ｔ
10
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
hole of the core
= Turn count
1
1
10
100
1000
Frequency (MHz)
Fig.2 Relationship between impedance and turn counts
Fig.1 How to count turns
■Effective band range depending on core material
There are two materials of ferrite, Ni-Zn series and Mn-Zn series. Ni-Zn series is effective
for MHz band range such as FM band while Mn-Zn series is effective for kHz band range.
Note that above effective band range is a reference only. Examination of effectiveness
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.
Mn-Zn series vs Ni-Zn series ½ ½ Characteristics (representative example)
Z -f
(measurement condition: measured with same-dimension ring core)
1000
AM band range
100
FM band range
Ni-Zn series core
Impedance ( )
Mn-Zn series core
10
1
0.01
0.1
1
10
100
1000
Frequency (MHz)
Fig.3 Effective Band Range of Mn-Zn series / Ni-Zn series ferrite
EMI Core
5
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
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