Ferrites and accessories
E 42/21/20
Core and accessories
Series/Type:
Date:
B66329, B66243
September 2006, September 2008, August 2010
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EPCOS AG 2010. Reproduction, publication and dissemination of this publication, enclosures
hereto and the information contained therein without EPCOS’ prior express consent is prohibited.
E 42/21/20
Core
■
To IEC 61246
■
Delivery mode: single units
B66329
Magnetic characteristics
(per set)
6
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
Material
N27
N87
A
L
value
nH
4750 +30/–20%
5200 +30/–20%
P
e
1560
1690
P
V
W/set
< 4.4 (200 mT, 25 kHz, 100 °C)
< 12.0 (200 mT, 100 kHz, 100 °C)
Ordering code
B66329G0000X127
B66329G0000X187
Gapped
Material
g
mm
N27
0.25
r0.02
0.50
r0.05
1.00
r0.05
1.50
r0.05
A
L
value
approx.
nH
1029
603
354
259
P
e
Ordering code
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
09/06
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 2007, chapter “Processing notes, 2.1”
Sections
1
A
N
mm
2
172
l
N
mm
100
A
R
value
P:
20
Pins
18
Ordering code
B66243B1018T001
Material:
B66243
Hole arrangement
View in mounting direction
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
09/06
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 2007, chapter “Processing notes, 2.1”
Sections
1
A
N
mm
2
187
l
N
mm
133
A
R
value
P:
24.4
Pins
12
Ordering code
B66243S1012T001
Material:
B66243
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
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 their special behavior
under mechanical load.
Just like any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing or
tensile load. Especially fast cooling rates under ultrasonic cleaning, high static and 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 the value for the initial permeability. Thus, the embedding medium should offer
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 irreversibly when exposed to strong
magnetic fields.
Processing notes
– The start of the winding process should be soft. Otherwise, the flanges may be destroyed.
– Excessive winding forces may damage the flanges or squeeze the tube so that the cores can no
longer be mounted.
– Excessive soldering time at high temperature (>300 °C) may affect 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 contamination with tin oxide (SnO) from the tin bath or
burned insulation from the wire. For detailed information see Data Book 2007, chapter
"Processing notes, 2.2".
– The dimensions of the pin hole arrangement are fixed and should be understood as an ideal
recommendation for drilling the printed circuit board. In order to avoid problems when mounting
the transformer, customers should make allowances for manufacturing tolerances in the drilling
and pick-and-place processes by increasing the diameter of the pin holes.
5
09/06
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