N87

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Date: September 2006 © EPCOS AG 2006. Reproduction, publication and di ssemination of this publication, enclosures hereto and the information contained therein without EPCOS’ prior express consent is prohibited. Ferrites and accessories SIFERRIT material N87

Please read Cautions and warnings and Important notes at the end of this document. Material properties Preferred application P ower transformers Material N87 Base material MnZn Symbol Unit Initial permeability (T = 25 °C) μi 2200 ±25% Flux density (H = 1200 A/m, f = 10 kHz) BS (25 °C) BS (100 °C) mT mT 490 390 Coercive field strength (f = 10 kHz) Hc (25 °C) Hc (100 °C) A/m 21 Optimum frequency range kHz 25 … 500 Hysteresis material constant ηB 10–6/mT <1.0 Curie temperature T C °C >210 Mean value of αF at 25 … 55 °C 10–6/K 4 Density (typical values) kg/m 3 4850 Relative core losses (typical values) PV 25 kHz, 200 mT, 100 °C kW/m 3 57 100 kHz, 200 mT, 100 °C kW/m 3 375 300 kHz, 100 mT, 100 °C kW/m 3 390 500 kHz, 50 mT, 100 °C kW/m 3 215 Resistivity ρΩ m1 0 Core shapes RM, P, PM, ETD, EFD, E, ER, EP, EQ, ELP, U, Toroid N87 SIFERRIT materials

Please read Cautions and warnings and Important notes at the end of this document. N87 SIFERRIT materials Complex permeability versus frequency (measured on R34 toroids, B ≤0.25 mT) FAL0596-E 110 210 310 410 f 100 ’;sµ ’’µs 102__ 1 100 1012 10MHz ’sµ ’’sµ Amplitude permeability versus AC field flux density (measured on R34 toroids, B ≤0.25 mT) FAL0598-V B aµ 100 200 300 400 mT 500 < 10 kHzf 25 ˚C 1000 2000 3000 4000 6000 100 ˚C Initial permeability μi versus temperature (measured on R34 toroids, B ≤0.25 mT) FAL0597-M T µi 1000 2000 3000 5000 20 60 100 140 180 260 0_60 20_

Please read Cautions and warnings and Important notes at the end of this document. N87 SIFERRIT materials Dynamic magnetization curves (typical values) (f = 10 kHz, T = 25 °C) FAL0599-4 H B -200 0 200 400 600 800 1000 A/m 1400 mT 100 200 300 500 DC magnetic bias of P, RM, PM and E cores (B ≤0.25 mT, f = 10 kHz, T = 25 °C) FAL0601-J µrev 100 101 102 104 100 101 102 104 µe = 1000 500 200 100 A/m DCH Dynamic magnetization curves (typical values) (f = 10 kHz, T = 100 °C) FAL0600-B H B -200 0 200 400 600 800 1000 A/m 1400 100 200 300 400 500 mT DC magnetic bias of P, RM, PM and E cores (B ≤0.25 mT, f = 10 kHz, T = 100 °C) FAL0602-S µrev 100 101 102 104 100 101 102 104 µe = 1000 500 200 100 A/m DCH

Please read Cautions and warnings and Important notes at the end of this document. N87 SIFERRIT materials Relative core losses versus AC field flux density (measured on R34 toroids) VP m kW = 100 kHzf 100 ˚C B 25 ˚C FAL0603-1 010 110 210 310 110 210 310mT Relative core losses versus frequency (measured on R34 toroids) FAL0605-H PV kW f 010 110 210 310 410 101 5 kHz 100 ˚C 1023 10 25 ˚C 200 mT 100 mT 50 mT 25 mT Relative core losses versus temperature (measured on R34 toroids) FAL0604-9 f 210 310 410 kW/m T PV 40 60 80 100 ˚C 120 3 = 100 kHz 200 mT 100 mT 50 mT 100 25 mT

Based on IEC 60401-3, the data specified here are ty pical data for the material in question, which have been determined principally on the basis of toroids (ring cores). The purpose of such characteristic material data is to provide the user with improved means for comparing different materials. There is no direct relationship between characte ristic material data and the data measured using other core shapes and/or core sizes made of the sa me material. In the absence of further agree- ments with the manufacturer, only those specifications given for the core shape and/or core size in question are binding. Effects of core combination on AL value Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparent that the initial permeability is dependent on the stress state of the core. The higher the stresses are in the core, the lower is the value for the init ial permeability. Thus the embedding medium should have the greatest possible elasticity. For detailed information see Data Book 2007, chapter “General – Definitions, 8.2”. Heating up Ferrites can run hot during operation at higher flux densities and higher frequencies.

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