Ferrites and accessories
E 55/28/21
Core
Series/Type:
Date:
B66335
May 2017
EPCOS AG 2017. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS’ prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
E 55/28/21
Core
■
To IEC 62317-8
■
Delivery mode: single units
B66335
Magnetic characteristics
(per set)
Σl/A
l
e
A
e
A
min
V
e
= 0.35 mm
–1
= 124 mm
= 354 mm
2
= 351 mm
2
= 43900 mm
3
Approx. weight
215 g/set
Ungapped
Mate- A
L
value
rial
nH
N27
N87
N97
5800 +30/–20%
6400 +30/–20%
6700 +30/–20%
μ
e
B
S
*
mT
P
V
W/set
< 8.00 (200 mT, 25 kHz, 100 °C)
< 3.80 (100 mT, 100 kHz, 100 °C)
< 3.34 (100 mT, 100 kHz, 100 °C)
Ordering code
B66335G0000X127
B66335G0000X187
B66335G0000X197
1610 320
1780 320
1868 320
* H = 250 A/m; f = 10 kHz; T = 100 °C
Gapped
(A
L
values/air gaps examples)
Material
g
mm
N27,
N87
0.50
±0.05
1.00
±0.05
1.50
±0.05
2.00
±0.05
A
L
value
approx.
nH
843
496
364
292
μ
e
Ordering code
** = 27 (N27)
**
= 87 (N87)
B66335G0500X1**
B66335G1000X1**
B66335G1500X1**
B66335G2000X1**
234
138
101
81
The A
L
value in the table applies to a core set comprising one ungapped core (dimension g = 0 mm)
and one gapped core (dimension g > 0 mm).
Other A
L
values/air gaps and materials available on request – see Processing remarks on page 4.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
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E 55/28/21
Core
Calculation factors
(for formulas, see
“E cores: general information”
)
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N27
N87
Validity range:
496
496
K2 (25 °C)
–0.764
–0.764
Calculation of saturation current
K3 (25 °C)
836
800
K4 (25 °C)
–0.847
–0.796
K3 (100 °C) K4 (100 °C)
781
765
–0.865
–0.873
B66335
K1, K2: 0.15 mm < s < 3.50 mm
K3, K4: 180 nH < A
L
< 1799 nH
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
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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.
4
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Ferrites and accessories
Cautions and warnings
Display of ordering codes for EPCOS products
The ordering code for one and the same product can be represented differently in data sheets,
data books, other publications and the website of EPCOS, or in order-related documents such as
shipping notes, order confirmations and product labels.
The varying representations of the
ordering codes are due to different processes employed and do not affect the
specifications of the respective products.
Detailed information can be found on the Internet
under www.epcos.com/orderingcodes.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
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