Data Sheet
Data Sheet
Date:
September 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS' prior express consent is prohibited.
Ferrites and accessories
E 42/21/20
Core and accessories
Series/Type:
B66329, B66243
2
09/06
Please read Cautions and warnings and
Important notes at the end of this document.
To IEC 61246
Delivery mode: single units
Magnetic characteristics (per set)
l/A = 0.41 mm
1
l
e
= 97 mm
A
e
= 234 mm
2
A
min
= 229 mm
2
V
e
= 22700 mm
3
Approx. weight 116 g/set
Ungapped
Gapped
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")
Validity range:
K1, K2: 0.10 mm < s < 3.00 mm
K3, K4: 160 nH < A
L
< 1500 nH
Material
A
L
value
nH
e
P
V
W/set
Ordering code
N27
4750 +30/20%
1560
< 4.4 (200 mT, 25 kHz, 100 C)
B66329G0000X127
N87
5200 +30/20%
1690
< 12.0 (200 mT, 100 kHz, 100 C)
B66329G0000X187
Material
g
mm
A
L
value
approx.
nH
e
Ordering code
N27
0.25
0.02
1029
338
B66329G0250X127
0.50
0.05
603
198
B66329G0500X127
1.00
0.05
354
116
B66329G1000X127
1.50
0.05
259
85
B66329G1500X127
Material
Relationship between
air gap A
L
value
Calculation of saturation current
K1 (25 C)
K2 (25 C)
K3 (25 C)
K4 (25 C)
K3 (100 C)
K4 (100 C)
N27
354
0.770
574
0.847
534
0.865
N87
354
0.770
555
0.796
521
0.873
B66329
Core
E 42/21/20
3
09/06
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former
Material:
GFR polyterephthalate (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 C), color code black
Valox 420-SE0
[E45329 (M)], GE PLASTICS B V
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 2007, chapter "Processing notes, 2.1"
Sections
A
N
mm
2
l
N
mm
A
R
value
Pins
Ordering code
1
172
100
20
18
B66243A1018T001
Hole arrangement
View in mounting direction
B66243
Accessories
E 42/21/20
4
09/06
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former
Material:
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 2007, chapter "Processing notes, 2.1"
Sections
A
N
mm
2
l
N
mm
A
R
value
Pins
Ordering code
1
187
133
24.4
12
B66243S1012T001
FEK0467-3-E
27.5
1.3+0.1
4 x 7.5
5
27.5
20.2+0.2
350.2
12.4+0.2
1
3
5 7 11 9
2
4
6
8 12 10
15.2+0.2
6.8 min.
26.4
410.2
40.5
46
1
22.8+0.3
37+0.3
Hole arrangement
View in mounting direction
B66243
Accessories
E 42/21/20
5
09/06
Ferrites and accessories
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 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 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 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 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.
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