EFD 25/13/9 Core B66421 l E core with flattened, lower center leg for especially flat transformer design l For DC/DC converters l EFD cores are supplied as single units Magnetic characteristics (per set) 1 S l/A = 0,98 mm l = 57 mm e 2 A = 58 mm e 2 A = 57 mm min 3 V = 3 310 mm e Approx. weight 16,6 g/set Ungapped Material A value m A P Ordering code L e L1min V nH nH W/set N67 2000 + 30/ 20 % 1560 1280 2,10 B66421-G-X167 (200 mT, 100 kHz, 100 C) N87 2000 + 30/ 20 % 1560 1280 1,80 B66421-G-X187 (200 mT, 100 kHz, 100 C) Gapped Material A value m g Ordering code L e approx. ** = 67 (N67) nH mm = 87 (N87) N67, 160 10 % 125 0,55 B66421-U160-K1** N87 250 10 % 195 0,30 B66421-U250-K1** 315 10 % 246 0,22 B66421-U315-K1** 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 (see page 423 for formulas) 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) N67 103 0,734 150 0,820 142 0,881 N87 103 0,734 154 0,796 138 0,873 Validity range: K1, K2: 0,10 mm < s < 1,40 mm K3, K4: 50 nH < A < 410 nH L 554 Siemens Matsushita ComponentsEFD 25/13/9 Accessories B66422 Coil former Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085: F max.operating temperature 155 C), color code green Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3,5 s Winding: see page 156 Squared pins Yoke l Material: Stainless spring steel (0,4 mm) Coil former Ordering code Sections A l A value Pins N N R 2 mm mm mW 1 40,7 50 42,3 10 B66422-B1010-D1 Yoke (ordering code per piece, 2 are required) B66422-B2000 Coil former Yoke 250,2 View A Mounting holes 13,1 0,15 Montagelochung 12 345 10 6 1,3+0,1 1 5 10 9876 5 Duroplast Thermosetting plastic 4 x 5 = 20 Marking of pin 1 Markierung fr Stift 1 18 0,25 18 0,2 11,7+0,2 16,4 min. 0,6 FEK0330-M CuSn6, tinnedCuSn6, verzinnt Siemens Matsushita Components 555 3,50,2 12,8 max. 1,7 5,5+0,2 26 0,3 12 0,2 1,6 0,1 22,5 6,9 0,1