Ferrites and accessories E 40/16/12 Core Series/Type: B66381 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. E 40/16/12 Core B66381 Size based on US lam. size E cores US designation E 21 Delivery mode: single units Magnetic characteristics (per set) 1 l/A = 0.52 mm l = 77 mm e 2 A = 149 mm e 2 A = 143 mm min 3 V = 11500 mm e Approx. weight 58 g/set Ungapped Material A value P Ordering code L e V nH W/set N27 3800 +30/20% 1560 < 2.15 (200 mT, 25 kHz, 100 C) B66381G0000X127 N87 4150 +30/20% 1710 < 5.80 (200 mT, 100 kHz, 100 C) B66381G0000X187 N72 4600 +30/20% 1900 < 1.12 (200 mT, 25 kHz, 100 C) B66381G0000X172 Gapped Material g A value Ordering code L e approx. mm nH N27 0.500.05 411 166 B66381G0500X127 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) N27 239 0.782 378 0.847 351 0.865 Validity range: K1, K2: 0.10 mm < s < 2.50 mm K3, K4: 130 nH < A < 1200 nH L Please read Cautions and warnings and 2 06/13 Important notes at the end of this document.