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. * MnZn 100 MHz (AM band range) * Consumer electronics and NiZn 300 MHz (FM band range) Tips on EMI Core Usages options available EMI Cores * Ring Solid construction Type 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 1range - How count turns turns resu be checked that it is in the desired asto adding When the desired performance of an EMI core cannot be Characteristics and how to count turns obtained with a single pass through the core,Number the impedance of turns are counted by how many times the lead wire pa characteristics can be changed with multiple turns. hole of the core. Do not count the number of lead wire winding Represe ntative ExampleESD-R-16C 1000 10000 Impedance () 10000 lts in lowering down the sses through the inner outside the core, as it results 1000 3T Resonance point changes to lower A turn is counted by the number of lead-wire When windings which desired performance can not be obtained just b y 1 turn, impedance characteristics 2T 1T 2T 3T 100 e frequency band should value can be raised b y increasing th e turn. In this case, the pass through the inner hole of the core. Windings on the 1T that it is in the desired range as adding turns resu lts in lowering down the outside of the core do not count. See Figurebe1checked for examples 1T 2T Figure 23T- Relationship between impedance and turn count. 10 *Number of lead wire wound outside the core + 1 = Number of read wire passes through the inner (Representative example: ESD-R-16C) of one, two, and three turns. hole of the core ntative ExampleESD-R-16C Represe Fig.1 How to count turns 100 1 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 10 1 1 10 changes to lower band100 Resonance point How to count turns 3T Fig.2 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 100 1 Impedance Increase 1000 Impedance () Adding turns will result in higher impedance while also lowering the effective frequency range. See Figure 2 for an example. *Number of lead wire wound outside the core + 1 10000 = Turn count = Number of read wire passes through the inner hole of the core = Turn count Fig.1 Impedance Increase value can be raised b Impedance Increase Turns and Impedance Characteristics Tips on EMI Core Usages When desired performance can not be obtained just b Impedance () Ring Type Note that above e band range i 1 ies. Ni-Zn series is 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 KEMET As Mn-Zn series lower resistance compared to Ni-Zn seri Frequency (MHz) As Mn-Zn series has lower resistance compared tohas Ni-Zn series, make sure to provide EMI Cores: Nickel Zinc (NiZn) and Manganese insulation before Fig.1 How to adequate count turns insulation before use. Fig.2 adequate Relationship between impedance an use. d turn counts Zinc (MnZn). Each core material has a different Figure 3 - Effective band range of MnZn and NiZn ferrite core material. Mn-Zn series vs Ni-Zn series Z-f Characteristics (representative example) Mn-Zn series vs Ni-Zn series ring core) Z-f Characteristics (r resistance and effective frequency range. The MnZn (Representative example, measured with same-dimension condition: ring core) There are two materials of ferrite, Ni-Zn(measurement series and Mn-Zn sermeasured with same-dimension ies. Ni-Zn series is e (measurement condition: measured with same-dimensi 1000 core material has a lower resistance compared to ive for kHz band range. 1000 the NiZn; therefore, adequate insulation is required e band range i s a reference only. Examination of s Note that above with actual instrument is necessary. before use. AM band range FM band range make AM bandsure rangeto provide NiZn series core As Mn-Zn series has lower resistance compared to Ni-Zn series, The NiZn core material is typically 100 Z-fMnZn Characteristics (representative example) frequencies in the MHz band range such as the Mn-Zn series vs Ni-Zn series series core (measurement condition: measured with same-dimension ring core) FM-band, while the MnZn core material is typically1000 MnZn series core 10 effective for the kHz band range such as the AMband. See Figure 3. 10 FM band range AM band range Impedance () It is recommended to measure the actual frequency100 range effectiveness in the target application. 10 NiZn series core 1 0.01 MnZn series core 0.1 Fig.3 1 10 100 1000 Frequency (MHz) 1 0.1 One te 1KEMET 10 world. One Frequency1 (MHz) E5009_B-20 * 3/25/2015 0.01 (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com Fig.3 1 NiZn ser Impedance () Impedance () effectiveadequate for insulation before use. 100 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 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 1000 100 10 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 range is for reference only. Please test with actual device before use. Coated 1 1 10 100 Frequency (MHz) 1000 Frequency Range1 1000 Impedance () Impedance () 10000 Dimensions (mm) B-20F-38 H 3.0 4.3 4.3 8.0 1.2 4.4 7.0 4.8 4.2 100 10 1 100 MHz (AM band range) 1 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 * 3/25/2015 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 (MHz) (c) KEMET Electronics Corporation * P.O. Box Frequency 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com 10 1 Frequency (MHz) E5009_B-20 * 3/25/2015 3 Impedance () Impedance () 100 10 Cores EMI Cores - B-20 Series Bead 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 * 3/25/2015 4 EMI Cores - B-20 Series Bead Cores KEMET Corporation World Headquarters Europe Asia Southern Europe Sasso Marconi, Italy Tel: 39-051-939111 Northeast Asia Hong Kong Tel: 852-2305-1168 Mailing Address: P.O. Box 5928 Greenville, SC 29606 Skopje, Macedonia Tel: 389-2-55-14-623 Shenzhen, China Tel: 86-755-2518-1306 www.kemet.com Tel: 864-963-6300 Fax: 864-963-6521 Central Europe Landsberg, Germany Tel: 49-8191-3350800 Corporate Offices Fort Lauderdale, FL Tel: 954-766-2800 Kamen, Germany Tel: 49-2307-438110 North America Northern Europe Harlow, United Kingdom Tel: 44-1279-460122 Taipei, Taiwan Tel: 886-2-27528585 Espoo, Finland Tel: 358-9-5406-5000 Southeast Asia Singapore Tel: 65-6701-8033 2835 KEMET Way Simpsonville, SC 29681 Southeast Lake Mary, FL Tel: 407-855-8886 Northeast Wilmington, MA Tel: 978-658-1663 Central Novi, MI Tel: 248-306-9353 Beijing, China Tel: 86-10-5877-1075 Shanghai, China Tel: 86-21-6447-0707 Seoul, South Korea Tel: 82-2-6294-0550 Penang, Malaysia Tel: 60-4-6430200 Bangalore, India Tel: 91-806-53-76817 West Milpitas, CA Tel: 408-433-9950 Mexico Guadalajara, Jalisco Tel: 52-33-3123-2141 Note: KEMET reserves the right to modify minor details of internal and external construction at any time in the interest of product improvement. KEMET does not assume any responsibility for infringement that might result from the use of KEMET Capacitors in potential circuit designs. 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 * 3/25/2015 5 EMI Cores - B-20 Series Bead Cores Disclaimer This product has been made available through a Private Label Agreement and a Development and Cross-Licensing Agreement between KEMET and NEC TOKIN to expand market and product offerings for both companies and their respective customers. For more information, please visit http://www.kemet.com/nectokin. 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. (c) KEMET Electronics Corporation * P.O. Box 5928 * Greenville, SC 29606 (864) 963-6300 * www.kemet.com E5009_B-20 * 3/25/2015 6