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Ferrites and accessories
EFD 20/10/7
Core and accessories
Series/Type:
B66417, B66418
Date:
September 2006
Data Sheet
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS’ prior express consent is prohibited.
EFD 20/10/7
Core
■ E core with flattened, lower center leg
for especially flat transformer design
■ For DC/DC converters
■ Delivery mode: single units
Magnetic characteristics (per set)
Σl/A = 1.52 mm–1
le = 47 mm
Ae = 31 mm2
Amin = 31 mm2
Ve = 1460 mm3
Approx. weight 7.2 g/set
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B66417
Ungapped
Material
N49
N87
N97
AL value
nH
910 +30/–20%
1200 +30/–20%
1250 +30/–20%
µe
1100
1440
1510
PV
W/set
Ordering code
< 0.29 ( 50 mT, 500 kHz, 100 °C) B66417G0000X149
< 1.05 (200 mT, 100 kHz, 100 °C) B66417G0000X187
< 0.80 (200 mT, 100 kHz, 100 °C) B66417G0000X197
Gapped
Material
N87
AL value
nH
100 ±10%
160 ±10%
µe
120
193
g
approx. mm
0.49
0.25
Ordering code
B66417U0100K187
B66417U0160K187
The AL 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
N87
Relationship between
air gap – AL value
K1 (25 °C) K2 (25 °C)
61.1 –0.699
Calculation of saturation current
K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
85.4
– 0.796
75.7
– 0.873
Validity range:
K1, K2: 0.10 mm < s < 1.40 mm
K3, K4: 50 nH < AL < 410 nH
Please read Cautions and warnings and
Important notes at the end of this document.
2 09/06
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