EPCOS T37

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.
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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.
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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.
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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.
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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. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our
Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more
detailed questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products.
Consequently, we cannot guarantee that all products named in this publication will always be
available.
The aforementioned does not apply in the case of individual agreements deviating from the
foregoing for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current version
of the “General Terms of Delivery for Products and Services in the Electrical Industry”
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DSSP, MiniBlue,
MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, SIFERRIT, SIFI, SIKOREL,
SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are
trademarks registered or pending in Europe and in other countries. Further information will be
found on the Internet at www.epcos.com/trademarks.
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