Ferrites and accessories
EFD 15/8/5
Core and accessories
Series/Type: B66413, B66414
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 15/8/5
Core B66413
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 = 2.27 mm
l = 34 mm
e
2
A = 15 mm
e
2
A = 12.2 mm
min
3
V = 510 mm
e
Approx. weight 2.8 g/set
Ungapped
Material A value P Ordering code
L e V
nH W/set
N49 600 +30/20% 1080 < 0.11 ( 50 mT, 500 kHz, 100 C) B66413G0000X149
N87 780 +30/20% 1400 < 0.28 (200 mT, 100 kHz, 100 C) B66413G0000X187
N97 820 +30/20% 1480 < 0.23 (200 mT, 100 kHz, 100 C) B66413G0000X197
Gapped
Material A value g Ordering code
L e
nH approx. mm
N87 100 10% 180 0.17 B66413U0100K187
160 15% 288 0.08 B66413U0160L187
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 29.7 0.676 44.2 0.796 33.2 0.873
Validity range: K1, K2: 0.10 mm < s < 1.00 mm
K3, K4: 30 nH < A < 280 nH
L
Please read Cautions and warnings and
2 06/13
Important notes at the end of this document.