FPC film
C350, C351
C350, C351
Basic features
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FPC is a composite material of polymer and ferrite
■
FPC film is a thin, mechanically flexible film
B68450, B68451
Technical benefits
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■
■
■
■
■
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Stable magnetic characteristics
Low weight: FPC film is 40% lower in density than ferrite
High mechanical strength
Shaping as required: customer-specific solutions possible
Economy: easy transport and storage,
simple, rationalized processing, low mounting volume
C351 film suitable for high-temperature applications (up to 200 C)
Material C351 approved to UL 94-V0 (E 140 693)
Various film thickness (from 0.2 to 0.4 mm), thickness tolerance 15%
Self-adhesive versions (limited shelf life)
Applications
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Implementation of low-profile coils, e.g. for
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– identification systems
– security tags for electronic article surveillance
– sensors
– inductive reading of smart cards
Electromagnetic shielding of coils from metals to prevent interference
EMC: absorption of radiated emissions at frequencies 500 MHz
Compensation of deflection yokes to correct distortion at the corners of TV screens and monitors
Spacing between ferrite cores (as a substitute for air gaps or non-magnetic films) for
– suppression of the leakage field
– adjustment of the biasing curve
Please read
Cautions and warnings
and
Important notes
at the end of this document.
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Ferrites and accessories
Cautions and warnings
Cautions and warnings
Mechanical stress and mounting
Ferrite cores have to meet mechanical requirements during assembling and for a growing number
of applications. Since ferrites are ceramic materials one has to be aware of the special behavior
under mechanical load.
As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast tempera-
ture changing or tensile load. Especially high cooling rates under ultrasonic cleaning and high static
or cyclic loads can cause cracks or failure of the ferrite cores.
For detailed information see data book, chapter
“General - Definitions, 8.1”.
Effects of core combination on A
L
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, chapter
“General - Definitions, 8.1”.
Heating up
Ferrites can run hot during operation at higher flux densities and higher frequencies.
NiZn-materials
The magnetic properties of NiZn-materials can change irreversible in high magnetic fields.
Ferrite Accessories
EPCOS ferrite accessories have been designed and evaluated only in combination with EPCOS
ferrite cores. EPCOS explicitly points out that EPCOS ferrite accessories or EPCOS ferrite cores
may not be compatible with those of other manufacturers. Any such combination requires prior te-
sting by the customer and will be at the customer‘s own risk.
EPCOS assumes no warranty or reliability for the combination of EPCOS ferrite accessories with
cores and other accessories from any other manufacturer.
Processing remarks
The start of the winding process should be soft. Else the flanges may be destroyed.
– Too strong winding forces may blast the flanges or squeeze the tube that the cores can not be
mounted any more.
– Too long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrange-
ment.
– Not following the processing notes for soldering of the J-leg terminals may cause solderability
problems at the transformer because of pollution with Sn oxyde of the tin bath or burned insula-
tion of the wire. For detailed information see chapter
“Processing notes”,
section 2.2.
– The dimensions of the hole arrangement have fixed values and should be understood as
a recommendation for drilling the printed circuit board. For dimensioning the pins, the group
of holes can only be seen under certain conditions, as they fit into the given hole arrangement.
To avoid problems when mounting the transformer, the manufacturing tolerances for positioning
the customers’ drilling process must be considered by increasing the hole diameter.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
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