Ferrites and accessories
E 42/21/20
Core and accessories
Series/Type:
Date:
B66329, B66243
June 2013
Data Sheet
EPCOS AG 2015. 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 42/21/20
Core
■
To IEC 61246
■
Delivery mode: single units
B66329
Magnetic characteristics
(per set)
l/A
l
e
A
e
A
min
V
e
= 0.41 mm
–1
= 97 mm
= 234 mm
2
= 229 mm
2
= 22700 mm
3
Approx. weight
116 g/set
Ungapped
Mate- A
L
value
rial
nH
N27
N87
N95
N97
4750 +30/–20%
5200 +30/–20%
6700 +30/–20%
5400 +30/–20%
e
B
S
*
mT
P
V
W/set
< 4.4 (200 mT, 25 kHz, 100 °C)
< 12.0 (200 mT, 100 kHz, 100 °C)
Ordering code
B66329G0000X127
B66329G0000X187
1560 320
1690 320
2292 320
1781 320
< 12.60 (200 mT, 100 kHz, 25 °C) B66329G0000X195
< 11.50 (200 mT, 100 kHz, 100 °C)
< 10.2 (200 mT, 100 kHz, 100 °C)
B66329G0000X197
* H = 250 A/m; f = 10 kHz; T = 100 °C
Gapped
Material
g
mm
0.250.02
0.500.05
1.000.05
1.500.05
A
L
value
approx.
nH
1029
603
354
259
e
Ordering code
N27
338
198
116
85
B66329G0250X127
B66329G0500X127
B66329G1000X127
B66329G1500X127
The A
L
value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
one gapped core (dimension g > 0).
Calculation factors
(for formulas, see
“E cores: general information”
)
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N27
N87
Validity range:
354
354
K2 (25 °C)
– 0.770
– 0.770
Calculation of saturation current
K3 (25 °C)
574
555
K4 (25 °C)
– 0.847
– 0.796
K3 (100 °C) K4 (100 °C)
534
521
– 0.865
– 0.873
K1, K2: 0.10 mm < s < 3.00 mm
K3, K4: 160 nH < A
L
< 1500 nH
2
06/13
Please read
Cautions and warnings
and
Important notes
at the end of this document.
E 42/21/20
Accessories
Coil former
GFR polyterephthalate (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 °C), color code black
Valox 420-SE0
®
E121562 (M)
, SABIC INNOVATIVE PLASTICS
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 °C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 °C, 3.5 s
Winding:
see Data Book 2013, chapter “Processing notes, 2.1”
Sections
1
A
N
mm
2
172
l
N
mm
100
A
R
value
20
Pins
18
Ordering code
B66243B1018T001
Material:
B66243
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
06/13
E 42/21/20
Accessories
Coil former
Polyterephthalate GV (UL 94 V-0, insulation class to IEC 60085:
H max. operating temperature 180 °C), color code black
Rynite FR 530
®
E41938 (M)
, E I DUPONT DE NEMOURS & CO INC
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 °C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 °C, 3.5 s
Winding:
see Data Book 2013, chapter “Processing notes, 2.1”
Sections
1
A
N
mm
2
187
l
N
mm
133
A
R
value
24.4
Pins
12
Ordering code
B66243S1012T001
Material:
B66243
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
06/13
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 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 chapter
“Definitions”,
section 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 chapter
“Definitions”,
section 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 destroid.
– 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 oxyd of the tin bath or burned insulation
of the wire. For detailed information see chapter
“Processing notes”,
section 8.2.
– 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.
5
06/13
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