Ferrites and accessories EFD 30/15/9 Core and accessories Series/Type: B66423, B66424 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 30/15/9 Core B66423 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 = 0.99 mm l = 68 mm e 2 A = 69 mm e 2 A = 69 mm min 3 V = 4690 mm e Approx. weight 24 g/set Ungapped Material A value P Ordering code L e V nH W/set N87 2050 +30/20% 1610 < 2.6 (200 mT, 100 kHz, 100 C) B66423G0000X187 N97 2150 +30/20% 1690 < 2.2 (200 mT, 100 kHz, 100 C) B66423G0000X197 Gapped Material A value g Ordering code L e nH approx. mm N87 160 10% 125 0.71 B66423U0160K187 250 10% 196 0.38 B66423U0250K187 315 10% 246 0.27 B66423U0315K187 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 125 0.712 176 0.796 161 0.873 Validity range: K1, K2: 0.10 mm < s < 2.00 mm K3, K4: 70 nH < A < 630 nH L Please read Cautions and warnings and 2 06/13 Important notes at the end of this document.