Ferrites and accessories EFD 30/15/9 Core and accessories Series/Type: B66423, B66424 Date: May 2017 EPCOS AG 2017. 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 Other A values/air gaps and materials available on request see Processing remarks on page 4. L Gapped (A values/air gaps examples) L 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 mm) L and one gapped core (dimension g > 0 mm). 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 5/17 Important notes at the end of this document.