Ferrites and accessories
EFD 20/10/7
Core and accessories
Series/Type: B66417, B66418
Date: June 2013
Data SheetData 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. EFD 20/10/7
Core B66417
E core with flattened, lower center leg
for especially flat transformer design
For DC/DC converters
Delivery mode: single units
Magnetic characteristics (per set)
1
l/A = 1.52 mm
l = 47 mm
e
2
A = 31 mm
e
2
A = 31 mm
min
3
V = 1460 mm
e
Approx. weight 7.2 g/set
Ungapped
Material A value P Ordering code
L e V
nH W/set
N49 910 +30/20% 1100 < 0.29 ( 50 mT, 500 kHz, 100 C) B66417G0000X149
N87 1200 +30/20% 1440 < 1.05 (200 mT, 100 kHz, 100 C) B66417G0000X187
N97 1250 +30/20% 1510 < 0.80 (200 mT, 100 kHz, 100 C) B66417G0000X197
Gapped
Material A value g Ordering code
L e
nH approx. mm
N87 100 10% 120 0.49 B66417U0100K187
160 10% 193 0.25 B66417U0160K187
The A value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
L
one gapped core (dimension g > 0).
Calculation factors (for formulas, see E cores: general information )
Material Relationship between Calculation of saturation current
air gap A value
L
K1 (25 C) K2 (25 C) K3 (25 C) K4 (25 C) K3 (100 C) K4 (100 C)
N87 61.1 0.699 85.4 0.796 75.7 0.873
Validity range: K1, K2: 0.10 mm < s < 1.40 mm
K3, K4: 50 nH < A < 410 nH
L
Please read Cautions and warnings and
2 06/13
Important notes at the end of this document.