Protection with EMC Ferrites

Protection with EMC Ferrites

Effective EMC protection is achieved by the insertion of ferrites. This article takes a quick look at four advantages of using Wurth Electronics ferrites.

Suppressing Unwanted Signals with EMC Ferrites

CE testing of electronic devices in the EMC lab clearly shows whether RF aspects were taken into account within the design process. Even at low clock frequencies e.g. in microprocessor-controlled devices, interferences can occur beyond the useful frequency range. These unwanted signals must be supressed. EMC ferrites are recommended for absorbing high frequency mains-borne interference as a means of retrospective suppression. These components are available in a variety of construction types and provide fast and cost-effective solutions. The performance of the final product is not affected as no redesign is required. Wire wound components and increasingly SMD ferrites are ideal for interference suppression on these circuits. These solutions offer an effective decoupling process directly at the source of interference.

How do EMC ferrites from Würth Elektronik assist in this case?

Ferrites used for EMC suppression are usually nickel-zinc. Their high surface resistance (>106 Ω)prevents leakage current or causing short-circuits. The special feature of these ferrites is that above 100 MHz, the real part of the loss resistance dominates.

The result is a whole series of advantages:

  • As the ferrite operates as an ”absorber“ for frequencies above approx. 10 MHz, the useful signal is affected.
  • The low-pass filter effect of wire wound ferrites or SMD ferrites is achieved solely by itself; no ground potential must exist as a third pole.
  • Wideband interference suppression with just a single component.
  • No capacitive influence on data or signal lines.

Ferrite Design Kits

Want to learn more about Ferrites? Visit our catalog where you can purchase our ferrite design kit and ask questions from the ferrite experts.

Click the links below to find these kits on the Digi-Key Website

Product Index > Kits > EMI, Filter Kits

Product Index > Kits > Inductor Kits


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Information and media in this post was provided by Würth Elektronik.


Applicable Part Numbers
DK Part # Mfr Part # Description Series
732-10084-ND 742700 EMI SUPPRESSION AXIAL FERRITE BE WE-AFB
732-10085-ND 742711 SNAP FERRITES -
732-10086-ND 742841 SMD FERRITES WE-CBF HF WE-CBF
732-10146-ND 744230 SMD COMMON MODE LINE FILTERS WE- WE-CNSW
732-10147-ND 744630 COMMON MODE POWER LINE CHOKES WE WE-LF
732-10148-ND 744725 SMD COMMON MODE LINE FILTERS -
732-10150-ND 744800 COMMON MODE POWER LINE CHOKES WE WE-CMBNC
732-10151-ND 744821 COMMON MODE POWER LINE CHOKES WE WE-CMB
732-10152-ND 744825 COMMON MODE POWER LINE CHOKES WE WE-CMB, WE-CMBH
732-10153-ND 782013 AXIAL EMI SUPPRESSION FERRITES W Automotive, AEC-Q200, WE-AEFA
732-10154-ND 782792 SMD EMI SUPPRESSION FERRITE BEAD WE-CBA
732-10180-ND 760801 POWER FACTOR CORRECTION CHOKES W WE-PFC
732-11546-ND 74271151 FERRITE 417OHM HINGED 15.01MM Star-Tec
732-11547-ND 74271151S FERRITE 417OHM HINGED 15.01MM Star-Tec
732-11548-ND 74271251 FERRITE 525OHM HINGED 24.99MM Star-Tec
732-11549-ND 74271251S FERRITE 525OHM HINGED 24.99MM Star-Tec
732-13172-ND 74271733S SNAP FERRITE W/FLEXIBLE CABLE FI Star-Fix
732-13448-ND 74272142 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13457-ND 74272131 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13458-ND 74272132 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13459-ND 74272151 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13460-ND 74272211 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13461-ND 74272221 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13462-ND 74272222 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13463-ND 74272251 STAR-TEC LFS SNAP FERRITE WITH S Star-Tec LFS
732-13464-ND 7427014 WE-TOF EMI SUPPRESSION TOROIDAL WE-TOF
732-13466-ND 74270051 WE-AFB EMI SUPPRESSION AXIAL FER WE-AFB
732-13468-ND 74271633 STAR-GAP SNAP FERRITE FOR RF APP WE-STAR-GAP
732-13478-ND 7427141 SNAP-RING SNAP FERRITE WITH PLAS Snap-Ring
732-13480-ND 742701716 WE-TOF EMI SUPPRESSION TOROIDAL WE-TOF
732-13483-ND 74271622 STAR-GAP SNAP FERRITE FOR RF APP WE-STAR-GAP
732-13485-ND 742724759 STAR-FLAT SNAP FERRITE WITH SAFE WE-FLAT
732-13783-ND 7427502 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13784-ND 74275043 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13785-ND 7427504 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13786-ND 7427501 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13787-ND 74275013 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13788-ND 7427503 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13789-ND 74275022 WE-UKW EMI SUPPRESSION 6-HOLE FE WE-UKW
732-13997-ND 742722 FLAT FERRITE CORES WE-FLAT WE-FLAT
732-14008-ND 74271722S STAR-FIX SNAP FERRITE WITH FLEXI Star-Fix
732-1499-ND 7427246 FERRITE CORE 194 OHM HINGED Star-Flat
732-1500-ND 7427247 FERRITE CORE 192 OHM HINGED Star-Flat
732-1501-ND 7427248 FERRITE CORE 180 OHM HINGED Star-Flat
732-1502-ND 74272475 FERRITE CORE 114 OHM HINGED Star-Flat
732-1503-ND 74271112 FERRITE CORE 321 OHM HINGED 6MM Star-Tec
732-1504-ND 74271131 FERRITE CORE 246 OHM HINGED Star-Tec
732-1505-ND 74271132 FERRITE CORE 241 OHM HINGED Star-Tec
732-1506-ND 74271221 FERRITE CORE 270 OHM HINGED Star-Tec
732-1507-ND 74271222 FERRITE CORE 265 OHM HINGED Star-Tec
732-1508-ND 7427153 FERRITE CORE 165 OHM HINGED 8MM Star-Ring
732-1509-ND 7427151 FERRITE CORE 119 OHM HINGED Star-Ring
732-1510-ND 7427154 FERRITE CORE 130 OHM HINGED 16MM Star-Ring
732-1511-ND 7427155 FERRITE CORE 110 OHM HINGED 27MM Star-Ring
732-1513-ND 74271622S FERRITE CORE 140 OHM HINGED Star-Gap
732-1514-ND 74271633S FERRITE CORE 100 OHM HINGED 8MM Star-Gap
732-1515-ND 74270111 FERRITE CORE 50 OHM SOLID 3.3MM WE-TOF
732-1517-ND 742701121 FERRITE CORE 123 OHM SOLID 5MM WE-TOF
732-1520-ND 74270162 FERRITE CORE 94 OHM SOLID 6.76MM WE-TOF
732-1522-ND 74270117 FERRITE CORE 161 OHM SOLID 10MM WE-TOF
732-1540-ND 74270033 FERRITE CORE 162 OHM SOLID WE-AFB
732-1541-ND 74270030 FERRITE CORE 158 OHM SOLID 5MM WE-AFB
732-1545-ND 74270037 FERRITE CORE 199 OHM SOLID 5.6MM WE-AFB
732-1551-ND 74270034 FERRITE CORE 160 OHM SOLID 7.3MM WE-AFB
732-1553-ND 74270052 FERRITE CORE 170 OHM SOLID 8MM WE-AFB
732-1558-ND 74270091 FERRITE CORE 170 OHM SOLID 9.5MM WE-AFB
732-1644-ND 742792 KIT DESIGN FERRITE CHIP BEAD WE-CBF
732-1913-ND 74271722 FERRITE CORE 270 OHM HINGED Star-Fix
732-1914-ND 74271733 FERRITE CORE 246 OHM HINGED 8MM Star-Fix
732-1915-ND 742791 KIT FERRITE SMD 1206-1812 SIZES WE-CBF
732-1916-ND 742790 KIT FERRITE SMD 0402-0805 SIZES WE-CBF
732-1920-ND 744864 KIT CHOKE FC SERIES WE-FC
732-2395-ND 7427221 FERRITE CORE 166 OHM SOLID WE-FLAT
732-2404-ND 74272733 FERRITE CORE 62 OHM HINGED 8MM STAR-FIX LFS
732-2405-ND 742730021 FERRITE BEAD 170 OHM RADIAL 4LN WE-MLS
732-2406-ND 742730022 FERRITE BEAD 248 OHM RADIAL 4LN WE-MLS
732-2407-ND 74273002 FERRITE BEAD 249 OHM RADIAL 4LN WE-MLS
732-2408-5-ND 74273001 FERRITE BEAD 264 OHM RADIAL 3LN WE-MLS
732-2409-5-ND 742730023 FERRITE BEAD 334 OHM RADIAL 4LN WE-MLS
732-3086-ND 74272722 FERRITE CORE 40 OHM HINGED STAR-FIX LFS
732-3090-ND 7427727 FERRITE CORE 100 OHM SOLID WE-AFB LFS
732-3302-ND 74275812 FERRITE CORE 200 OHM HINGED 5MM STAR-BUENO
732-3303-ND 74275813 FERRITE CORE 200 OHM HINGED STAR-BUENO
732-3304-ND 74275815 FERRITE CORE 350 OHM HINGED STAR-BUENO
732-3419-ND 74271142 FERRITE CORE 182 OHM HINGED 5MM Star-Tec
732-3420-ND 74271142S FERRITE CORE 182 OHM HINGED 5MM Star-Tec
732-3617-ND 7427153S FERRITE CORE 165 OHM HINGED 8MM Star-Ring
732-3619-ND 74271222S FERRITE CORE 265 OHM HINGED Star-Tec
732-3621-ND 74271221S FERRITE CORE 270 OHM HINGED Star-Tec
732-3623-ND 74271132S FERRITE CORE 241 OHM HINGED Star-Tec
732-3625-ND 74271131S FERRITE CORE 246 OHM HINGED Star-Tec
732-3627-ND 74271112S FERRITE CORE 321 OHM HINGED 6MM Star-Tec
732-3629-ND 74271111S FERRITE CORE 320 OHM HINGED 5MM Star-Tec
732-3635-ND 7427151S FERRITE CORE 119 OHM HINGED Star-Ring
732-3636-ND 7427155S FERRITE CORE 110 OHM HINGED 27MM Star-Ring
732-3637-ND 7427154S FERRITE CORE 130 OHM HINGED 16MM Star-Ring
732-3977-ND 74270024 FERRITE CORE 119 OHM SOLID WE-SAFB
732-3978-ND 74270023 FERRITE CORE 160 OHM SOLID 4MM WE-SAFB
732-3979-ND 742700221 FERRITE CORE 45 OHM SOLID 4MM WE-SAFB
732-3980-ND 74270022 FERRITE CORE 59 OHM SOLID 4MM WE-SAFB
732-3981-ND 74270021 FERRITE CORE 88 OHM SOLID 3MM WE-SAFB
732-3982-ND 74270020 FERRITE CORE 108 OHM SOLID 2.4MM WE-SAFB
732-3983-ND 7427002 FERRITE CORE 125 OHM SOLID 1.2MM WE-SAFB
732-3985-ND 74270015 FERRITE CORE 95 OHM SOLID 2MM WE-SAFB
732-3992-ND 742700726 FERRITE CORE 278 OHM SOLID 4MM WE-SAFB
732-3993-ND 7427007141 FERRITE CORE 45 OHM SOLID 2MM WE-SAFB
732-3996-ND 74271111 FERRITE CORE 320 OHM HINGED 5MM Star-Tec
732-7427143-ND 7427143 SNAP-RING SNAP FERRITE -
732-7427144-ND 7427144 SNAP-RING SNAP FERRITE -
732-78271111-ND 78271111 CAR-TEC SNAP FERRITE ; 316 ; 3.5 WE-CAR-TEC
732-78271111S-ND 78271111S CAR-TEC SNAP FERRITE ; 316 ; 3.5 WE-CAR-TEC
732-78271112-ND 78271112 CAR-TEC SNAP FERRITE ; 316 ; 4.5 WE-CAR-TEC
732-78271112S-ND 78271112S CAR-TEC SNAP FERRITE ; 316 ; 4.5 WE-CAR-TEC
732-78271131-ND 78271131 CAR-TEC SNAP FERRITE ; 235 ; 6.0 WE-CAR-TEC
732-78271131S-ND 78271131S CAR-TEC SNAP FERRITE ; 235 ; 6.0 WE-CAR-TEC
732-78271132-ND 78271132 CAR-TEC SNAP FERRITE ; 235 ; 7.0 WE-CAR-TEC
732-78271132S-ND 78271132S CAR-TEC SNAP FERRITE ; 235 ; 7.0 WE-CAR-TEC
732-9640-ND 74271211 FERRITE CORE 425 OHM HINGED 21MM Star-Tec
732-9641-ND 74271211S FERRITE CORE 425 OHM HINGED 21MM Star-Tec
7427114-ND 7427114 FERR SLV SNAP W/CASE 5.0MM GRY SNAP-SLEEVE
7427122-ND 7427122 FERRITE CORE 273 OHM HINGED -
‎74271833-ND‎ 74271833 FERRITE CORE 113 OHM HINGED 8MM Star-Gap
DK Part # Mfr Part # Description Series
732-1917-ND 744028 KIT INDUCTOR TPC SMALL SIZES WE-TPC
732-10155-ND 744032 SMD INDUCTORS WE-LQ WE-LQ
732-1918-ND 744043 KIT INDUCTOR TPC MED SIZES WE-TPC
732-1919-ND 744062 KIT INDUCTOR TPC LARGE SIZES WE-TPC
732-10159-ND 744070 SMD TINY POWER INDUCTORS WE-TPC WE-TPC
732-10174-ND 744300 SMD HIGH CURRENT FLAT WIRE INDUC WE-HCM
732-2229-ND 744332 KIT INDUCTOR WE-HCC SMD WE-HCC
732-10087-ND 744705 TOROIDAL LINE CHOKES WE-FI WE-FI
732-10088-ND 744713 ROD CORE INDUCTORS WE-SD WE-SD
732-1645-ND 744720 KIT DESIGN FOR LINEAR TECH WE-PD for Linear Tech
732-1923-ND 744721 KIT CHOKES FOR EXAR
732-1656-ND 744722 KIT INDUCTOR FOR MPS WE-TPC
744724-ND 744724 KIT DESIGN FOR NATIONAL REF WE-PD for National Semiconductor
732-4494-ND 744728 DESIGN KIT INDUCTORS FOR TI
732-10179-ND 744731 SHIELDED RADIAL LEADED WIRE WOUN WE-TIS
732-10177-ND 744741 RADIAL LEADED WIRE INDUCTORS WE- WE-TI
732-10178-ND 744743 RADIAL LEADED WIRE INDUCTORS WE- WE-TI
732-1926-ND 744770 KIT INDUCTOR PD SERIES LARGE WE-PD
732-10162-ND 744773 SMD POWER INDUCTORS WE-PD2 - 453 WE-PD2
732-10163-ND 744775 SMD POWER INDUCTORS WE-PD2 - 785 WE-PD2
732-1924-ND 744777 KIT INDUCTOR PD SERIES MED SIZES WE-PD
732-1925-ND 744778 KIT INDUCTOR PD SERIES SMALL WE-PD
732-744779-ND 744779 DESIGN KIT WE-PDF SMT SHIELDED P WE-PDF
732-10176-ND 744870 SEPIC APPLICATIONS WE-DD WE-DD
732-10175-ND 744894 SMD SHIELDED COUPLED INDUCTORS W WE-TDC
732-784701-ND 784701 DESIGN KIT PD2A & PD2SA SMT POWE WE-PD2A
732-784770-ND 784770 DESIGN KIT WE-PDA SMT POWER INDU WE-PDA
732-10164-ND 784773 SMD POWER INDUCTORS WE-PD2A - 45 WE-PD2A
732-10165-ND 784775 SMD POWER INDUCTORS WE-PD2A - 78 WE-PD2A
732-784778-ND 784778 WE-PDA SMT POWER INDUCTOR 2 SIZE WE-PDA
732-10156-ND 7440402 SMD POWER INDUCTORS WE-LQS - 252 WE-LQS
732-10157-ND 7440405 SMD POWER INDUCTORS WE-LQS - 504 WE-LQS
732-10160-ND 7440894 SMD POWER INDUCTORS WE-SPC WE-SPC
732-10161-ND 7447713 SMD POWER INDUCTORS WE-PD - 1030 WE-PD
732-10084-ND 742700 EMI SUPPRESSION AXIAL FERRITE BE EMI SUPPRESSION AXIAL FERRITE BE
732-10085-ND 742711 SNAP FERRITES SNAP FERRITES
732-10086-ND 742792 KIT DESIGN FERRITE CHIP BEAD KIT DESIGN FERRITE CHIP BEAD
732-10153-ND 742841 SMD FERRITES WE-CBF HF SMD FERRITES WE-CBF HF
732-10154-ND 782792 SMD EMI SUPPRESSION FERRITE BEAD SMD EMI SUPPRESSION FERRITE BEAD
732-13997-ND 742722 FLAT FERRITE CORES WE-FLAT FLAT FERRITE CORES WE-FLAT
732-1644-ND 782013 AXIAL EMI SUPPRESSION FERRITES W AXIAL EMI SUPPRESSION FERRITES W
732-1915-ND 742791 KIT FERRITE SMD 1206-1812 SIZES KIT FERRITE SMD 1206-1812 SIZES
732-1916-ND 742790 KIT FERRITE SMD 0402-0805 SIZES KIT FERRITE SMD 0402-0805 SIZES
732-10184-ND 744762A/RFI FERRITE SMD INDUCTORS WE-RFI WE-RFI