Bead EMI Cores Type Ring Type Bead Cores [RoHS Compliant] Dimensions (mm) Model 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-95B Frequency range OD ID H up to 100MHz (mainly AM band range) 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 3.0 4.3 4.3 8.0 1.2 4.4 7.0 4.8 4.2 Remarks up to 300MHz (mainly FM band range) (coated) Above frequency range is a reference only. Please test with actual device before use. Shape and Dimensions ID Beads Cores OD H Impedance vs. Frequency B-20F-28 B-20F-38 1000 1000 Impedance () Impedance () 10000 100 10 1 100 10 1 1 10 100 Frequency (MHz) 1000 1 10 100 1000 Frequency (MHz) EMI Core All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. Please request for a specification sheet for detailed product data prior to the purchase. Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9634ESDVOL09E1106E2 EMI Cores Bead Type Ring Type Impedance vs. Frequency B-20F-46 B-20F-57 1000 Impedance () Impedance () 1000 100 10 1 1 10 100 100 10 1 1000 1 Frequency (MHz) B-20L-25 B-20L-34 Impedance () Impedance () 1000 1000 100 10 1 10 100 100 10 1 1000 1 Frequency (MHz) 10 100 1000 Frequency (MHz) B-20L-44 B-20L-48B 1000 1000 Impedance () Impedance () 100 Frequency (MHz) 1000 1 10 100 10 1 100 10 1 1 10 100 1000 Frequency (MHz) 1 10 100 1000 Frequency (MHz) B-20L-95B Impedance () 1000 100 10 1 1 10 100 1000 Frequency (MHz) EMI Core All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. Please request for a specification sheet for detailed product data prior to the purchase. Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 9634ESDVOL09E1106E2