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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 T57
Please read Cautions and warnings and Important notes at the end of this document. Material properties Preferred application Broadband transformers Material T57 Base material MnZn Symbol Unit Initial permeability (T = 25 °C) μi 4000 ±25% Meas. field strength Flux density (near saturation) (f = 10 kHz) H BS (25 °C) BS (100 °C) A/m mT mT 1200 430 270 Coercive field strength (f = 10 kHz) Hc (25 °C) Hc (100 °C) A/m A/m Optimum frequency range fmin fmax MHz 0.01 … 0.5 Relative at fmin loss factorat fmax tan δ/μi 10–6 10–6 <70 Hysteresis material constant ηB 10–6/mT <0.3 Curie temperature T C °C >140 Relative temperature coefficient at 25 … 55 °C at 5 … 25 °C αF 10–6/K Mean value of α F at 25 … 55 °C 10–6/K 0.5 Density (typical values) kg/m 3 4900 Disaccommodation factor at 25 °C DF 10 –6 — Resistivity ρΩ m3 Core shapes RM, P, EP, Toroid T57 SIFERRIT materials
Please read Cautions and warnings and Important notes at the end of this document. T57 SIFERRIT materials Complex permeability versus frequency (measured on R17 toroids, B ≤0.25 mT) FAL0645-B 110 210 310 410 f 100 ’;sµ ’’µs 102__ 1 100 1012 10MHz ’sµ ’’sµ Variation of initial permeability with temperature (measured on R17 toroids, B ≤0.25 mT) FAL0647-S T µii 1µ- i1µ 02 0 40 ˚C 80 µi1 4000 _40 20 _70_ 60_ 50_ 40_ 30_ 20_ 10_ Initial permeability μi versus temperature (measured on R17 toroids, B ≤0.25 mT) FAL0646-J T µi 2000 4000 6000 12000 20 60 100 ˚C160 0_60 20 _ Relative loss factor versus frequency (measured on R17 toroids, B ≤0.25 mT) FAL0648-1 µ i tan δ f 110 210 310 410kHz 10 5_
Please read Cautions and warnings and Important notes at the end of this document. T57 SIFERRIT materials Dynamic magnetization curves (typical values) (f = 10 kHz, T = 25 °C) FAL0649-9 H B -200 0 200 400 600 800 1000 A/m 1400 100 200 300 400 500 mT Reversible permeability versus temperature (measured on toroids at f = 100 kHz, HDC = 27.5 A/m, B = 6 mT) FAL0651-K T µrev ˚C0_ 20_40 500 1000 1500 2000 2500 3500 4000 20 40 60 100 Dynamic magnetization curves (typical values) (f = 10 kHz, T = 100 °C) FAL0650-C H B A/m mT 0 200 400 600 800 1000 1400 100 200 300 400 500 200_
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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