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. Type * MnZn 100 MHz (AMRing band range) * Consumer electronics and NiZn 300 MHz (FMTips band on EMI Core Usages range) options available EMI Cores * Solid construction 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 range 1 - How to countturns turns be checked that it is in the desired as adding resu When the desired performance of an EMI core cannot be obtained with a single pass throughCharacteristics the core, theand how to count turns Number of turns are counted by how many times the lead wire pa impedance characteristics can be changed with multiple hole of the core. Do not count the number of lead wire winding turns. Represe ntative ExampleESD-R-16C 1000 10000 Impedance () When desired performance can not be obtained just b 10000 lts in lowering down the sses through the inner outside the core, as it results 1000 3T Resonance point changes to lower y 1 turn, impedance characteristics 2T 1T 2T 3T 100 A turn is counted by the number of lead-wire windings e frequency band should value can be raised b y increasing th e turn. In this case, the 1T which pass through the inner hole of thebecore. Windings checked that it is in the desired range as adding turns resu lts in lowering down the 1T 2T Figure 23T- Relationship and turn count. 10 *Number of lead wire woundbetween outside theimpedance core + 1 on the outside of the core do not count. See Figure 1 for = Number of read wire passes through the inner (Representative example: ESD-R-16C) hole of the core ntative ExampleESD-R-16C Represe examples of one, two, and three turns. *Number of lead wire wound outside the core + 1 1 10000 = Turn count 1000 Fig.1 Impedance () Adding turns will result in higher impedance while also lowering the effective frequency range. See Figure 2 for an example. How to count turns 100 1 Fig.1 10 changes to lower band100 Resonance point How to count turns 3T Impedance Increase = Number of read wire passes through the inner hole of the core = Turn count Fig.2 Core Material and Effective Frequency Range Notethethat *Number of lead wire wound outside core +above 1 = Number of read wire passes through the inner with actual instrument hole of the core = Turn count 100 10 1 1 1000 Frequency (MHz) Fig.2 Relationship b Relationship between impedance an d turn count 2T There are two materials of ferrite, Ni-Zn series and Mn-Zn ser 1T There are two materials of ferrite, Ni-Zn series and Mn-Zn ser 2T 3T 10 1T Impedance Increase value can be raised b Impedance () Turns and Impedance Characteristics Tips on EMI Core Usages When desired performance can not be obtained just b Impedance Increase Ring Type ies. Ni-Zn series is Note that above e band range i 1 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 As Mn-Zn series has lower resistance compared to Ni-Zn seri Frequency (MHz) As Mn-Zn series has lower resistance compared to Ni-Zn series, make sure to provide KEMET EMI Cores: Nickel Zinc (NiZn) and insulation before Fig.1 How to adequate count turns insulation before use. Fig.2 adequate Relationship between impedance an use. d turn counts Manganese Zinc (MnZn). Each core material Figure 3 - Effective band range of MnZn and NiZn ferrite core material. Mn-Zn series vs Ni-Zn series Z-f Characteristics (representative example) has a different resistance and effective Mn-Zn series vssame-dimension Ni-Zn series Z-f Characteristics (r (Representative example, measured with ring core) (measurement condition: measured with same-dimension ring core) There are two materials of ferrite, Ni-Zn series and Mn-Zn ser ies. Ni-Zn series is e (measurement condition: measured with same-dimensi frequency range. The MnZn core material 1000 ive for kHz band range. 1000 has a lower resistance compared to the NiZn; e band range i s a reference only. Examination of s Note that above therefore, adequate insulation is required with actual instrument is necessary. AM band range FM band range before use. As Mn-Zn series has lower resistance compared to Ni-Zn series, make AM bandsure rangeto provide NiZn series core adequate insulation before use. 100 Impedance () It is recommended to measure the actual frequency range effectiveness in the target application. NiZn ser Impedance () Impedance () The NiZn core material is typically effective 100 Mn-Zn series vs Ni-Zn series Z-fMnZn Characteristics (representative example) series core for frequencies in the MHz band range such as (measurement condition: measured with same-dimension ring core) MnZn series core the FM-band, while the MnZn core material is 1000 10 typically effective for the kHz band range such as the AM-band. See Figure 3. 10 FM band range AM band range NiZn series core 100 1 0.01 MnZn series core 10 Fig.3 0.1 1 10 1 1000 te KEMET One world. One 0.1 1 10 Frequency1 (MHz) E5009_B-20 * 4/13/2017 0.01 (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com Fig.3 1 100 Frequency (MHz) 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 1000 100 10 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 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 Range1 1000 Impedance () Impedance () 10000 Dimensions (mm) B-20F-38 100 10 Frequency range is for reference only. Please test with actual device before use. 1 1 Coated 1 10 100 1000 1 Frequency (MHz) H 100 MHz (AM band range) 3.0 4.3 4.3 8.0 1.2 4.4 7.0 4.8 4.2 X X X X 10 300 MHz (FM band range) X X X X X 100 Frequency (MHz) 1000 Core (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com E5009_B-20 * 4/13/2017 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 Frequency (c) KEMET Electronics Corporation * P.O. Box 5928 *(MHz) Greenville, SC 29606 (864) 963-6300 * www.kemet.com 10 1 Frequency (MHz) E5009_B-20 * 4/13/2017 3 Impedance () Impedance () 100 10 EMI Cores - B-20 Series Bead Cores 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 (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com E5009_B-20 * 4/13/2017 4 EMI Cores - B-20 Series Bead Cores KEMET Electronic Corporation Sales Offices For a complete list of our global sales offices, please visit www.kemet.com/sales. Disclaimer 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 is a registered trademark of KEMET Electronics Corporation. (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com E5009_B-20 * 4/13/2017 5 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Kemet: B-20L-48B B-20L-34 B-20F-38 B-20F-28 B-20L-44 B-20L-25 B-20F-57 B-20F-46 B-20L-95B