PCH5.6/3.7 B65931C0000X033
Ferrite core B65931
SMP MAG D 2015-02-20
Please read Cautions and warnings and Page 3 of 5
Important notes at the end of this document.
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 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 2007, chapter “General – Definitions, 8.1”.
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.
NiZn-materials
The magnetic properties of NiZn-materials can change irreversible in high magnetic fields.
Processing notes
The start of the winding process should be soft. Else the flanges may be destroyed.
To strong winding forces may blast the flanges or squeeze the tube that the cores can no more be mount.
To long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrangement.
Not following the processing notes for soldering of the J-leg terminals may cause solderability problems at the
transformer because of pollution with Sn oxide of the tin bath or burned insulation of the wire. For detailed
information see Data Book 2007, chapter “Processing notes, 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.
