N51

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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 N51

Please read Cautions and warnings and Important notes at the end of this document. Material properties Preferred application Power transformers Material N51 1) Base material MnZn Symbol Unit Initial permeability (T = 25 °C) μi 3000 ±25% Flux density (H = 1200 A/m, f = 10 kHz) BS (25 °C) BS (100 °C) mT mT 480 380 Coercive field strength (f = 10 kHz) Hc (25 °C) Hc (100 °C) A/m 5 Optimum frequency range kHz 25 … 150 Hysteresis material constant η B 10–6/mT <0.4 Curie temperature T C °C >220 Mean value of αF at 25 … 55 °C 10–6/K 2 Density (typical values) kg/m 3 4800 Relative core losses (typical values) PV 25 kHz, 200 mT, 25 °C kW/m 3 75 100 kHz, 200 mT, 25 °C kW/m 3 450 300 kHz, 100 mT, 25 °C kW/m 3 400 500 kHz, 50 mT, 25 °C kW/m 3 — 25 kHz, 200 mT, 100 °C kW/m 3 110 100 kHz, 200 mT, 100 °C kW/m 3 700 300 kHz, 100 mT, 100 °C kW/m 3 630 500 kHz, 50 mT, 100 °C kW/m 3 — Resistivity ρΩ m6 Core shapes E, ER, ETD 1) Preliminary data N51 SIFERRIT materials

Please read Cautions and warnings and Important notes at the end of this document. N51 Preliminary data SIFERRIT materials Complex permeability versus frequency (measured on R34 toroids, B ≤0.25 mT) FAL0737-R f 100 10 010 10 1MHz 110 210 310 410 µ’’ s , µ’’s 2_ 1_ N51 s s Amplitude permeability versus AC field flux density (measured on R34 toroids, B ≤0.25 mT) FAL0739-8 B µa 1000 2000 3000 4000 6000 0 100 200 300 mT 450 C˚100 ˚C25 f < 10 kHz N51 Initial permeability μi versus temperature (measured on R34 toroids, B ≤0.25 mT) FAL0747-Y T µi C˚_40 1000 2000 3000 4000 6000 0 40 80 120 160 240 N51

Please read Cautions and warnings and Important notes at the end of this document. N51 Preliminary data SIFERRIT materials Dynamic magnetization curves (typical values) (f = 10 kHz, T = 25 °C) FAL0740-B H 0_200 B A/m mT 100 200 300 400 500 0 200 400 600 800 1000 1400 N51 DC magnetic bias measured on E cores (B ≤0.25 mT, f = 10 kHz, T = 25 °C) N51 FAL0758-E DCH 101 103 104 100 51 0 1 102 103 1045 5 A/m µrev = 50µe 100 200 500 1500 1000 Dynamic magnetization curves (typical values) (f = 10 kHz, T = 100 °C) FAL0741-J H 0_200 B A/m mT 100 200 300 400 500 0 200 400 600 800 1000 1400 N51

Please read Cautions and warnings and Important notes at the end of this document. N51 Preliminary data SIFERRIT materials Relative core losses versus AC field flux density (measured on R34 toroids) FAL0742-S B 10 1 kW VP 102 1035m T N51 25 C˚ 100˚C 010 101 210 103 f = 100 kHz f = 25 kHz Relative core losses versus temperature (measured on R34 toroids) FAL0744-9 kW PV m T 20 ˚C10 100 101 210 310 104 N51 100 mT 50 mT 25 mT f = 100 kHz 40 60 80 100 120 200 mT Relative core losses versus frequency (measured on R34 toroids) FAL0745-H f 10 1 010 110 210 310 410 kW VP 102 1035 kHz N51 25 C˚ 100˚C 25 mT 50 mT 100 mT 200 mT 300 mT Relative core losses versus temperature (measured on R34 toroids) FAL0743-1 kW PV m T 20 ˚C40 60 80 100 14010 100 101 210 310 104 N51 300 mT 200 mT 100 mT 50 mT 25 mT f = 25 kHz

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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