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
ETD 59/31/22
Core and accessories
Series/Type:
B66397, B66398
2
09/06
Please read Cautions and warnings and
Important notes at the end of this document.
To IEC 61185
For SMPS transformers with optimum
weight/performance ratio at small volume
Delivery mode: single units
Magnetic characteristics (per set)
l/A = 0.38 mm
1
l
e
= 139 mm
A
e
= 368 mm
2
A
min
= 368 mm
2
V
e
= 51200 mm
3
Approx. weight 260 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).
Material
A
L
value
nH
e
P
V
W/set
Ordering code
N27
5000 +30/20%
1500
< 9.62 (200 mT, 25 kHz, 100 C)
B66397G0000X127
N87
5300 +30/20%
1590
< 5.20 (100 mT, 100 kHz, 100 C)
B66397G0000X187
N97
5500 +30/20%
1660
< 4.50 (100 mT, 100 kHz, 100 C)
B66397G0000X197
Material
g
mm
A
L
value
approx.
nH
e
Ordering code
** = 27 (N27)
**
= 87 (N87)
N27,
0.20
0.02
1588
476
B66397G0200X1**
N87
1.00
0.05
508
152
B66397G1000X1**
1.50
0.05
381
114
B66397G1500X1**
2.00
0.05
311
93
B66397G2000X1**
FEK0066-5
22+0,9
31,2
_
0,4
22,1 0,9
_
22,1
0,9
_
43,6+2,2
59,81,4
B66397
Core
ETD 59/31/22
3
09/06
Please read Cautions and warnings and
Important notes at the end of this document.
Calculation factors (for formulas, see "E cores: general information")
Validity range:
K1, K2: 0.10 mm < s < 3.50 mm
K3, K4: 170 nH < A
L
< 1660 nH
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
508
0.708
853
0.847
799
0.865
N87
508
0.708
812
0.796
783
0.873
B66397
Core
ETD 59/31/22
4
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:
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"
Yoke
Material:
Stainless spring steel (0.4 mm)
Coil former
Yoke
Coil former
Ordering code
Sections
A
N
mm
2
l
N
mm
A
R
value
Pins
1
365.6
106.1
10.0
24
B66398W1024T001
Yoke (ordering code per piece, 2 are required)
B66398A2000X000
FEK0363-Y
22,10,2
12,90,3
+0,5
65,2
0,2
_
FEK0365-F-E
1.6+0.15
12 x 5.08 = 60.96
50.8
3.4+0.15
22.4 min.
24.9 max.
42.65 min.
66.9 max.
49.2 max.
4.50.5
41.2 min.
43.7 max.
66.2 max.
1
(for fixing with sheet-steel screw
DIN 7971-St 2.9 x 6.5-C)
Hole arrangement
View in mounting direction
marking
Pin 1
B66398
Accessories
ETD 59/31/22
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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