1© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
One world. One KEMET
EMI Cores
ESD-R-B Toroidal Cores for Round Cables
for Low & High Frequency (with snail-shaped case)
Benets
• MnZn≤10MHz(AMbandrange)andNiZn≤300MHz
(FMbandrange)optionsavailable
• Solid construction
• Easy to install with one M4 screw
• UL94V–2ameretardantratedcase
Overview
The KEMET ESD-R-B series solid toroidal cores are
designedtouseonroundcables.Thewiderangeof
ManganeseZinc(MnZn)andNickelZinc(NiZn)options
allowsfortargetingofspecicfrequencyranges.The
snail-shapedcaseallowsxingthecoreintheapplication
to avoid contact with other components.
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
• Consumer electronics
• Air conditioners
• Power conditioners
• Refrigerators
• Washingmachines
• Industrialequipment
• Medicalequipment
2© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Part Number System
ESD- R- 19 B
Series Shape Type CoreSize
OuterDimensionCode(mm) Core Material
ESD- Ring SeeTable1 B = Mn-Zn
D-B=Ni-Zn
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.
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.
3T2T1T
Figure 1 – How to count turns
Impedance Increase
Resonance point changes to lower band
3T
2T
1T
Impedance (Ω)
Frequency (MHz)
10,000
1 10 100 1,000
1,000
100
10
1
Figure 2 – Relationship between impedance and turn count.
(Representative example: ESD-R-16C)
Impedance (Ω)
Frequency (MHz)
AM band range FM band range
Mn-Zn series core
Ni-Zn series core
1,000
100
10
1
0.01 0.1 1 10 100 1,000
Figure 3 – Effective band range of Mn-Zn and Ni-Zn ferrite core material.
(Representative example, measured with same-dimension ring core)
3© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Magnetic Permeability of Ferrite Material
Inordertoachievemostecient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gure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
10 kHz
0
10,000
20,000
100 kHz 1 MHz 10 MHz 100 MHz 1 GHz
Effective Frequency Range
Magnetic Permeability
Ni-Zn Series
1400L
700L
S18H
S15H
10H
7H
5H
Mn-Zn Series
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
Higher magnetic permeability:
Higher noise suppression effect
in the lower frequency range
4© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Environmental Compliance
AllKEMETEMIcoresareRoHScompliant.
Dimensions – Millimeters
3.0
AøB
D
6.5
Cø5.1
See Table 1 for dimensions
Installation Example
5© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Performance Characteristics
Item Performance Characteristics
Operatingtemperature −25°Cto+60°C
Frequencyrange Lowfrequencyandhighfrequency
Outer diameter 21.5 – 51.5 mm
Inner diameter 8.8 – 21.5 mm
Thickness 13.0 – 17.5 mm
Type Snail-shaped case
Caseameresistantrating UL94 V–2
Material MnZn5HandNiZn700L
Table 1 – Ratings & Part Number Reference
Part
Number
Dimensions (mm) Weight
Case
Color
Compatible
Toroid Core
(Bare Type)
Frequency Range1Material
A B C
Maximum D(g) ≤ 10 MHz
(AM band range)
≤ 300 MHz
(FM band range) MnZN NiZn
ESD-R-19B
21.5 ±1.0
8.8 ±1.0
13.0
18.5 ±1.0
12.1
White
ESD-R-19S
X
5H
—
ESD-R-19D-B
21.5 ±1.0
8.8 ±1.0
13.0
18.5 ±1.0
11.7
Black
ESD-R-19SD
X
—
700L
ESD-R-25B
29.3 ±1.0
13.9 ±1.0
15.0
23.0 ±1.0
21.8
White
ESD-R-25S
X
5H
—
ESD-R-25D-B
29.3 ±1.0
13.9 ±1.0
15.0
23.0 ±1.0
12.9
Black
ESD-R-25SD
X
—
700L
ESD-R-38B
42.4 ±0.8
17.9 ±0.8
16.0
28.0 ±0.8
58.6
White
ESD-R-38D
X
5H
—
ESD-R-38D-B
42.4 ±0.8
17.9 ±0.8
16.0
28.0 ±0.8
58.6
Black
—
X
—
700L
ESD-R-47B
51.5 ±0.7
25.5 ±0.7
17.5
34.0 ±0.7
89.0
White
—
X
5H
—
ESD-R-47D-B
51.5 ±0.7
25.5 ±0.7
17.5
34.0 ±0.7
89.0
Black
—
X
—
700L
Part
Number
A B
C
Maximum
D(g)
Color Compatible
Toroid Core
(Bare Type)
≤ 10 MHz
(AM band range)
≤ 300 MHz
(FM band range)
MnZn NiZn
Dimensions Weight Frequency Range1Material
1 Frequency range is for reference only. Please test with actual device before use.
6© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Impedance vs. Frequency
7© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
Impedance vs. Frequency cont.
Packaging
Part Number Packaging Type Pieces per Box
ESD-R-19B
Tray
640
ESD-R-19D-B
ESD-R-25B 300
ESD-R-25D-B
ESD-R-38B 240
ESD-R-38D-B
ESD-R-47B 90
ESD-R-47D-B
8© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped 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eldsasthismightmagnetizetheproduct.
Temperatureuctuations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
specied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.
9© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard E5002_ESD-R-B • 9/14/2018
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
EMI Core – ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case)
KEMET Electronics Corporation Sales Offi ces
Foracompletelistofourglobalsalesoces,pleasevisitwww.kemet.com/sales.
Disclaimer
Allproductspeci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specicallydisclaims–anywarrantyconcerningsuitabilityforaspeci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.
KEMET is a registered trademark of KEMET Electronics Corporation.