KEMET-B-20L-34
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EMI Cores
B-20 Bead Cores for Round Cables for
Low & High Frequency (Bare & coated)
Overview
Applications
TheꢀKEMETꢀB-20ꢀseriesꢀbeadꢀcoresꢀareꢀdesignedꢀtoꢀuseꢀonꢀ
roundꢀcables.ꢀTheꢀwideꢀrangeꢀofꢀManganeseꢀZincꢀ(MnZn)ꢀ
andꢀNickelꢀZincꢀ(NiZn)ꢀoptionsꢀallowsꢀforꢀtargetingꢀspecificꢀ
frequencyꢀranges.
• Computers
• Telecommunications
•ꢀ Industrialꢀequipment
• Adapters
• Consumer
electronics
EMIꢀcoresꢀareꢀpartꢀofꢀaꢀfamilyꢀofꢀpassiveꢀcomponents,ꢀ
whichꢀaddressꢀtheꢀissuesꢀofꢀnoiseꢀorꢀelectromagneticꢀ
interferenceꢀ(EMI)ꢀinꢀcircuitsꢀorꢀsystems.
Benefits
•ꢀ MnZnꢀ≤ꢀ10ꢀMHzꢀ(AMꢀbandꢀrange)ꢀandꢀNiZnꢀ≤ꢀ300ꢀMHz
(FMꢀbandꢀrange)ꢀoptionsꢀavailableꢀ
• Solid
construction
•ꢀ Bareꢀandꢀcoatedꢀtypesꢀavailable
Part Number System
B-20
Series
B-20
L-
48
B-A
CoreꢀSize
OuterꢀDimensionꢀ(mm)
Core Material
Type
F = Mn-Zn
Lꢀ=ꢀNi-Zn
xx = x.x mm
Blank = Bare
Bꢀ/ꢀB-Aꢀ=ꢀCoatedꢀ(exceptꢀ48B)
B-Lꢀ=ꢀInsulationꢀresistanceꢀtesting
Built Into Tomorrow
© KEMET Electronics Corporation • One East Broward Boulevard
E5009_B-20 • 8/8/2023
1
EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Core Material and Effective Frequency Range
ThereꢀareꢀtwoꢀferriteꢀmaterialꢀoptionsꢀforꢀKEMETꢀ
EMIꢀCores:ꢀNickel-Zincꢀ(NiZn)ꢀandꢀManganeseꢀ
Zincꢀ(MnZn).ꢀEachꢀcoreꢀmaterialꢀhasꢀaꢀdifferentꢀ
resistanceꢀandꢀeffectiveꢀfrequencyꢀrange.ꢀTheꢀ
MnZn core material has a lower resistance
comparedꢀtoꢀtheꢀNiZn;ꢀtherefore,ꢀadequateꢀ
insulationꢀisꢀrequiredꢀbeforeꢀuse.
Figure 1 – Effective band range of Mn-Zn and Ni-Zn ferrite core material.
(Representative example, measured with same-dimension ring core)
1,000
100
10
AM band range
FM band range
Ni-Zn series core
TheꢀNiZnꢀcoreꢀmaterialꢀisꢀtypicallyꢀeffectiveꢀforꢀ
frequenciesꢀinꢀtheꢀMHzꢀbandꢀrangeꢀsuchꢀasꢀtheꢀ
FM-band,ꢀwhileꢀtheꢀMnZnꢀcoreꢀmaterialꢀisꢀtypicallyꢀ
effectiveꢀforꢀtheꢀkHzꢀbandꢀrangeꢀsuchꢀasꢀtheꢀAM-
band.ꢀSeeꢀFigureꢀ1.
Mn-Zn series core
1
0.01
0.1
1
10
100
1,000
It is recommended to measure the actual
frequencyꢀrangeꢀeffectivenessꢀinꢀtheꢀtargetꢀ
application.
Frequency (MH
z)
Environmental Compliance
AllꢀKEMETꢀEMIꢀcoresꢀareꢀRoHSꢀcompliant.
Dimensions – Millimeters
ID
OD
T
See Table 1 for dimensions
© KEMET Electronics Corporation • One East Broward Boulevard
E5009_B-20 • 8/8/2023
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EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Magnetic Permeability of Ferrite Material
Inꢀorderꢀtoꢀachieveꢀmostꢀefficientꢀnoiseꢀreduction,ꢀitꢀisꢀimportantꢀtoꢀselectꢀtheꢀmaterialꢀaccordingꢀtoꢀtheꢀtargetꢀfrequencyꢀ
band.ꢀDependingꢀonꢀitsꢀmagneticꢀpermeability,ꢀaꢀparticularꢀferriteꢀmaterialꢀwillꢀbeꢀeffectiveꢀinꢀaꢀcertainꢀfrequencyꢀband.
Aꢀschematicꢀrepresentationꢀofꢀtheꢀrelationshipꢀbetweenꢀtheꢀmagneticꢀpermeabilityꢀofꢀeachꢀmaterialꢀandꢀtheꢀcorrespondingꢀ
effectiveꢀbandꢀrangeꢀisꢀshownꢀinꢀFigureꢀ1.ꢀMaterialsꢀwithꢀhigherꢀmagneticꢀpermeabilityꢀareꢀeffectiveꢀinꢀtheꢀlowerꢀfrequencyꢀ
range,ꢀwhileꢀthoseꢀwithꢀlowerꢀmagneticꢀpermeabilityꢀareꢀeffectiveꢀinꢀtheꢀhigherꢀfrequencyꢀrange.ꢀThus,ꢀMn-Znꢀproductsꢀareꢀ
mainlyꢀusedꢀforꢀreducingꢀconductionꢀnoise,ꢀwhileꢀNi-Znꢀproductsꢀareꢀcommonlyꢀusedꢀforꢀradiationꢀnoiseꢀcountermeasures.
Theꢀeffectiveꢀfrequencyꢀrangeꢀvariesꢀdependingꢀonꢀcoreꢀshape,ꢀsizeꢀandꢀnumberꢀofꢀwindings.ꢀThisꢀfrequencyꢀdependenceꢀ
ofꢀtheꢀmagneticꢀpermeabilityꢀasꢀshownꢀinꢀtheꢀfigureꢀservesꢀforꢀreferenceꢀpurposesꢀonlyꢀandꢀitꢀshouldꢀbeꢀtestedꢀonꢀtheꢀactualꢀ
deviceꢀtoꢀdetermineꢀitsꢀeffectiveness.
S18H,ꢀS15H,ꢀ10H,ꢀ7H,ꢀ5H,ꢀ1400Lꢀandꢀ700LꢀareꢀKEMET’sꢀproprietaryꢀferriteꢀmaterialꢀnames.
Otherꢀmaterialsꢀcanꢀalsoꢀbeꢀavailableꢀonꢀrequest.
Figure 2 – 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
S18H
S15H
10H
10,000
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
7H
5H
Ni-Zn Series
1400L
700L
0
10 kHz
100 kHz
1 MHz
10 MHz
100 MHz
1 GHz
Effective Frequency Range
© KEMET Electronics Corporation • One East Broward Boulevard
E5009_B-20 • 8/8/2023
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EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Performance Characteristics
Item
Performance Characteristics
Operatingꢀtemperature
−25°Cꢀtoꢀ+85°C
Frequencyꢀrange
Outer diameter
Inner diameter
Thickness
Lowꢀfrequencyꢀandꢀhighꢀfrequency
2.5 – 9.7 mm
0.8 – 4.8 mm
1.2 – 8.0 mm
Type
Bare and coated
Table 1 – Ratings & Part Number Reference
Dimensions (mm)
Part Number
Frequency Range
1
Weight
(g)
Type
≤ 10 MHz
(AM band
≤ 300 MHz
(FM band range)
OD
ID
T
range)
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-48B-L
2.8 ±0.3
3.8 ±0.3
4.6 ±0.3
5.7 ±0.3
2.5 ±0.3
3.4 ±0.3
4.4 ±0.3
4.8 ±0.3
4.8 ±0.3
1.3 ±0.3
1.5 ±0.3
1.5 ±0.3
1.5 ±0.3
1.0 ±0.3
0.8 ±0.3
1.6 ±0.3
2.4 ±0.3
2.4 ±0.3
3.0 ±0.3
4.3 ±0.3
4.3 ±0.3
8.0 ±0.3
1.2 ±0.3
4.4 ±0.3
7.0 ±0.3
4.8 ±0.3
4.8 ±0.3
0.07
0.21
0.30
0.91
0.03
0.19
0.46
0.34
0.34
Bare
Bare
Bare
Bare
Bare
Bare
Bare
Bare
Bare
X
X
X
X
X
X
X
X
X
B-20L-48B-A
B-20L-95B
4.8 ±0.3
9.7 ±0.3
2.4 ±0.3
4.8 ±0.3
4.8 ±0.3
4.2 ±0.3
0.34
1.09
Coated
Coated
X
X
1
Frequency range is for reference only. Please test with actual device before use.
Impedance vs. Frequency
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E5009_B-20 • 8/8/2023
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EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Impedance vs. Frequency cont.
© KEMET Electronics Corporation • One East Broward Boulevard
E5009_B-20 • 8/8/2023
5
EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Impedance vs. Frequency cont.
Packaging
Part Number
Packaging Type
Pieces per Box
B-20F-28
B-20F-38
60,000
30,000
15,000
B-20F-46
B-20F-57
B-20L-25
B-20L-34
Bulk
B-20L-44
30,000
15,000
B-20L-48B
B-20L-48B-L
B-20L-48B-A
B-20L-95B
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E5009_B-20 • 8/8/2023
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EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
Handling Precautions
EMIꢀCoresꢀshouldꢀbeꢀstoredꢀinꢀnormalꢀworkingꢀenvironments.ꢀWhileꢀtheꢀEMIꢀCoresꢀthemselvesꢀareꢀquiteꢀrobustꢀinꢀotherꢀ
environments,ꢀavoidꢀexposureꢀtoꢀhighꢀtemperatures,ꢀhighꢀhumidity,ꢀcorrosiveꢀatmospheresꢀandꢀlongꢀtermꢀstorageꢀforꢀcase,ꢀ
snap-on and split types.
KEMETꢀrecommendsꢀthatꢀmaximumꢀstorageꢀtemperatureꢀnotꢀexceedꢀ40°Cꢀandꢀmaximumꢀstorageꢀhumidityꢀnotꢀexceedꢀ75%ꢀ
relativeꢀhumidity.ꢀAtmospheresꢀshouldꢀbeꢀfreeꢀofꢀchlorine,ꢀsulfurꢀandꢀalkaliꢀbearingꢀcompounds.ꢀAvoidꢀalsoꢀstorageꢀnearꢀ
strongꢀmagneticꢀfieldsꢀasꢀthisꢀmightꢀmagnetizeꢀtheꢀproduct.
Temperatureꢀfluctuationsꢀshouldꢀbeꢀminimizedꢀtoꢀavoidꢀcondensationꢀorꢀcracksꢀonꢀtheꢀparts.ꢀMechanicalꢀshocksꢀcanꢀbringꢀ
to cracks as well.
Export Control
For customers in Japan
Forꢀproductsꢀthatꢀareꢀcontrolledꢀitemsꢀsubjectꢀtoꢀtheꢀ“ForeignꢀExchangeꢀandꢀForeignꢀTradeꢀLaw”ꢀofꢀJapan,ꢀtheꢀexportꢀlicenseꢀ
specifiedꢀbyꢀtheꢀlawꢀisꢀrequiredꢀforꢀexport.
For customers outside Japan
EMIꢀCoreꢀproductsꢀshouldꢀnotꢀbeꢀusedꢀorꢀsoldꢀforꢀuseꢀinꢀtheꢀdevelopment,ꢀproduction,ꢀstockpilingꢀorꢀutilizationꢀofꢀanyꢀ
conventionalꢀweaponsꢀorꢀmass-destructiveꢀweaponsꢀ(nuclearꢀweapons,ꢀchemicalꢀorꢀbiologicalꢀweapons,ꢀorꢀmissiles),ꢀorꢀanyꢀ
other weapons.
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E5009_B-20 • 8/8/2023
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EMI Core – B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated)
KEMET Electronics Corporation Sales Offices
Disclaimer
YAGEOꢀCorporationꢀandꢀitsꢀa ꢀꢀliatesꢀdoꢀnotꢀrecommendꢀtheꢀuseꢀofꢀcommercialꢀorꢀautomotiveꢀgradeꢀproductsꢀforꢀhighꢀreliabilityꢀapplicationsꢀorꢀmannedꢀspaceꢀ ꢀight.
Allꢀproductꢀspeci ꢀcations,ꢀstatements,ꢀinformationꢀandꢀdataꢀ(collectively,ꢀtheꢀ“Information”)ꢀinꢀthisꢀdatasheetꢀareꢀsubjectꢀtoꢀchange.ꢀTheꢀcustomerꢀisꢀresponsibleꢀforꢀ
checkingꢀandꢀverifyingꢀtheꢀextentꢀtoꢀwhichꢀtheꢀInformationꢀcontainedꢀinꢀthisꢀpublicationꢀisꢀapplicableꢀtoꢀanꢀorderꢀatꢀtheꢀtimeꢀtheꢀorderꢀisꢀplaced.ꢀAllꢀInformationꢀgivenꢀ
hereinꢀisꢀbelievedꢀtoꢀbeꢀaccurateꢀandꢀreliable,ꢀbutꢀitꢀisꢀpresentedꢀwithoutꢀguarantee,ꢀwarranty,ꢀorꢀresponsibilityꢀofꢀanyꢀkind,ꢀexpressedꢀorꢀimplied.
StatementsꢀofꢀsuitabilityꢀforꢀcertainꢀapplicationsꢀareꢀbasedꢀonꢀKEMETꢀElectronicsꢀCorporation’sꢀ(“KEMET”)ꢀknowledgeꢀofꢀtypicalꢀoperatingꢀconditionsꢀforꢀsuchꢀ
applications,ꢀbutꢀareꢀnotꢀintendedꢀtoꢀconstituteꢀ–ꢀandꢀKEMETꢀspeci ꢀcallyꢀdisclaimsꢀ–ꢀanyꢀwarrantyꢀconcerningꢀsuitabilityꢀforꢀaꢀspeci ꢀcꢀcustomerꢀapplicationꢀorꢀuse.ꢀ
TheꢀInformationꢀisꢀintendedꢀforꢀuseꢀonlyꢀbyꢀcustomersꢀwhoꢀhaveꢀtheꢀrequisiteꢀexperienceꢀandꢀcapabilityꢀtoꢀdetermineꢀtheꢀcorrectꢀproductsꢀforꢀtheirꢀapplication.ꢀAnyꢀ
technicalꢀadviceꢀinferredꢀfromꢀthisꢀInformationꢀorꢀotherwiseꢀprovidedꢀbyꢀKEMETꢀwithꢀreferenceꢀtoꢀtheꢀuseꢀofꢀKEMET’sꢀproductsꢀisꢀgivenꢀgratis,ꢀandꢀKEMETꢀassumesꢀnoꢀ
obligationꢀorꢀliabilityꢀforꢀtheꢀadviceꢀgivenꢀorꢀresultsꢀobtained.
AlthoughꢀKEMETꢀdesignsꢀandꢀmanufacturesꢀitsꢀproductsꢀtoꢀtheꢀmostꢀstringentꢀqualityꢀandꢀsafetyꢀstandards,ꢀgivenꢀtheꢀcurrentꢀstateꢀofꢀtheꢀart,ꢀisolatedꢀcomponentꢀ
failuresꢀmayꢀstillꢀoccur.ꢀAccordingly,ꢀcustomerꢀapplicationsꢀwhichꢀrequireꢀaꢀhighꢀdegreeꢀofꢀreliabilityꢀorꢀsafetyꢀshouldꢀemployꢀsuitableꢀdesignsꢀorꢀotherꢀsafeguardsꢀ
(suchꢀasꢀinstallationꢀofꢀprotectiveꢀcircuitryꢀorꢀredundancies)ꢀinꢀorderꢀtoꢀensureꢀthatꢀtheꢀfailureꢀofꢀanꢀelectricalꢀcomponentꢀdoesꢀnotꢀresultꢀinꢀaꢀriskꢀofꢀpersonalꢀinjuryꢀorꢀ
propertyꢀdamage.
Althoughꢀallꢀproduct–relatedꢀwarnings,ꢀcautionsꢀandꢀnotesꢀmustꢀbeꢀobserved,ꢀtheꢀcustomerꢀshouldꢀnotꢀassumeꢀthatꢀallꢀsafetyꢀmeasuresꢀareꢀindicatedꢀorꢀthatꢀotherꢀ
measuresꢀmayꢀnotꢀbeꢀrequired.
WhenꢀprovidingꢀKEMETꢀproductsꢀandꢀtechnologiesꢀcontainedꢀhereinꢀtoꢀotherꢀcountries,ꢀꢀtheꢀcustomerꢀmustꢀabideꢀbyꢀtheꢀproceduresꢀandꢀprovisionsꢀstipulatedꢀinꢀallꢀ
applicableꢀexportꢀlawsꢀandꢀregulations,ꢀincludingꢀwithoutꢀlimitationꢀtheꢀInternationalꢀTra ꢀꢀcꢀinꢀArmsꢀRegulationsꢀ(ITAR),ꢀtheꢀUSꢀExportꢀAdministrationꢀRegulationsꢀ
(EAR)ꢀandꢀtheꢀJapanꢀForeignꢀExchangeꢀandꢀForeignꢀTradeꢀAct.
KEMET is a registered trademark of KEMET Electronics Corporation.
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E5009_B-20 • 8/8/2023
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