EMI Cores B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Overview Applications The KEMET B-20 series bead cores are designed to use on round cables. The wide range of Manganese Zinc (MnZn) and Nickel Zinc (NiZn) options allows for targeting 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. Computers Telecommunications Industrial equipment Adapters Consumer electronics Benefits * MnZn 10 MHz (AM band range) and NiZn 300 MHz (FM band range) options available * Solid construction * Bare and coated types available Part Number System B-20 L- 48 B-A Series Core Material Core Size Outer Dimension (mm) Type B-20 F = Mn-Zn L = Ni-Zn xx = x.x mm Blank = Bare B / B-A = Coated (except 48B) B-L = Insulation resistance testing One world. One KEMET (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 1 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Core Material and Effective Frequency Range There are two ferrite material options for KEMET EMI Cores: Nickel-Zinc (NiZn) and Manganese Zinc (MnZn). Each core material has a different resistance and effective frequency range. The MnZn core material has a lower resistance compared to the NiZn; therefore, adequate insulation is required before use. 1,000 AM band range Impedance () The NiZn core material is typically effective for frequencies in the MHz band range such as the FM-band, while the MnZn core material is typically effective for the kHz band range such as the AMband. See Figure 1. Figure 1 - Effective band range of Mn-Zn and Ni-Zn ferrite core material. (Representative example, measured with same-dimension ring core) 100 Mn-Zn series core 10 1 0.01 It is recommended to measure the actual frequency range effectiveness in the target application. FM band range Ni-Zn series core 0.1 1 10 100 1,000 Frequency (MHz) Environmental Compliance All KEMET EMI cores are RoHS compliant. Dimensions - Millimeters ID OD T See Table 1 for dimensions (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 2 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Magnetic Permeability of Ferrite Material In order to achieve most efficient 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 figure 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 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 Magnetic Permeability S18H S15H 10H 10,000 Lower magnetic permeability: Higher noise suppression effect in the higher frequency range 7H 5H Ni-Zn Series 0 10 kHz 1400L 700L 100 kHz 1 MHz 10 MHz 100 MHz 1 GHz Effective Frequency Range (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 3 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Performance Characteristics Item Performance Characteristics Operating temperature Frequency range Outer diameter Inner diameter Thickness Type -25C to +85C Low frequency and high frequency 2.5 - 9.7 mm 0.8 - 4.8 mm 1.2 - 8.0 mm Bare and coated Table 1 - Ratings & Part Number Reference Weight Dimensions (mm) Part Number 1 Frequency Range1 Type OD ID T (g) 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 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 10 MHz (AM band range) X X X X 300 MHz (FM band range) X X X X X X X Frequency range is for reference only. Please test with actual device before use. Impedance vs. Frequency (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 4 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Impedance vs. Frequency cont. (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 5 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) Impedance vs. Frequency cont. Packaging Part Number 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 B-20L-48B-A B-20L-95B Packaging Type Pieces per Box 60,000 30,000 15,000 Bulk (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com 30,000 15,000 E5009_B-20 * 9/18/2018 6 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) 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 40C 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 fields as this might magnetize the product. Temperature fluctuations 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 specified 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. (c) KEMET Electronics Corporation * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 7 EMI Core - B-20 Bead Cores for Round Cables for Low & High Frequency (Bare & coated) KEMET Electronics 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 * KEMET Tower * One East Broward Boulevard Fort Lauderdale, FL 33301 USA * 954-766-2800 * www.kemet.com E5009_B-20 * 9/18/2018 8