Ferrites and accessories SIFERRIT material T37 Date: September 2006 Data Sheet © EPCOS AG 2006. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS’ prior express consent is prohibited. SIFERRIT materials T37 Material properties Preferred application Broadband transformers Material T37 Base material MnZn Symbol Initial permeability (T = 25 °C) Unit μi 6500 ±25% A/m Meas. field strength H Flux density (near BS (25 °C) mT saturation) (f = 10 kHz) BS (100 °C) mT 1200 380 240 Coercive field strength (f = 10 kHz) A/m Hc (25 °C) Hc (100 °C) A/m Optimum frequency range fmin fmax MHz 0.01 … 0.30 Relativeat fmin loss factorat fmax tan δ/μi 10–6 10–6 <2 <60 Hysteresis material constant ηB 10–6/mT <1.1 Curie temperature TC °C Relative temperature coefficient αF at 25 … 55 °C at 5 … 25 °C Mean value of αF at 25 … 55 °C 9 8 >130 10–6/K — — 10–6/K – 0.3 kg/m3 4900 Disaccommodation factor at 25 °C DF 10–6 — Resistivity ρ Ωm Density (typical values) Core shapes 0.2 Toroid 1) Preliminary data Please read Cautions and warnings and Important notes at the end of this document. 2 09/06 SIFERRIT materials T37 Complex permeability versus frequency (measured on R16 toroids, B ≤0.25 mT) Initial permeability μi versus temperature (measured on R22 toroids, B ≤0.25 mT) Variation of initial permeability with temperature (measured on R22 toroids, B ≤0.25 mT) Relative loss factor versus frequency (measured on R16 toroids, B ≤0.25 mT) Please read Cautions and warnings and Important notes at the end of this document. 3 09/06 SIFERRIT materials T37 Dynamic magnetization curves (typical values) (f = 10 kHz, T = 25 °C) Dynamic magnetization curves (typical values) (f = 10 kHz, T = 100 °C) FAL0403-N 450 mT B 350 300 250 200 150 100 50 _0100 DC magnetic bias (measured on RM cores, typical values) (B ≤0.25 mT, f = 10 kHz, T = 25 °C) FAL0728-S 10 4 µ rev 10 3 5 10 2 10 0 5 10 1 A/m 10 2 HDC Please read Cautions and warnings and Important notes at the end of this document. 4 09/06 0 100 200 A/m 400 H SIFERRIT materials Cautions and warnings General Based on IEC 60401-3, the data specified here are typical 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 characteristic material data and the data measured using other core shapes and/or core sizes made of the same material. In the absence of further agreements 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 initial 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. 5 09/06 Important notes The following applies to all products named in this publication: 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application. As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether an EPCOS product with the properties described in the product specification is suitable for use in a particular customer application. 2. We also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified. In customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 3. The warnings, cautions and product-specific notes must be observed. 4. 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