Ferrites and accessories EFD 15/8/5 Core and accessories Series/Type: B66413, B66414 Date: June 2013 Data SheetData Sheet EPCOS AG 2013. Reproduction, publication and dissemination of this data sheet and the information contained therein without EPCOS prior express consent is prohibited.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.