EFD 30/15/9 Core B66423 ● E core with flattened, lower center leg for especially flat transformer design ● For DC/DC converters ● EFD cores are supplied as single units Magnetic characteristics (per set) Σl/A le Ae Amin Ve = 0,99 mm–1 = 68 mm = 69 mm2 = 69 mm2 = 4 690 mm3 Approx. weight 24 g/set Ungapped µe Material AL value AL1min PV N67 nH nH 2050 + 30/– 20 % 1610 1280 N87 2050 + 30/– 20 % 1610 1280 Ordering code W/set 3,00 B66423-G-X167 (200 mT, 100 kHz, 100 ˚C) 2,60 B66423-G-X187 (200 mT, 100 kHz, 100 ˚C) Gapped Material AL value µe N67, N87 nH 160 ± 10 % 250 ± 10 % 315 ± 10 % 125 196 246 g approx. mm 0,71 0,38 0,27 Ordering code ** = 67 (N67) = 87 (N87) B66423-U160-K1** B66423-U250-K1** B66423-U315-K1** The AL value in the table applies to a core set comprising one ungapped core (dimension g = 0) and one gapped core (dimension g > 0). Calculation factors (see page 423 for formulas) Material N67 N87 Validity range: 556 Relationship between air gap – AL value K1 (25 ˚C) K2 (25 ˚C) 125 – 0,712 125 – 0,712 Calculation of saturation current K3 (25 ˚C) 172 176 K4 (25 ˚C) – 0,820 – 0,796 K3 (100 ˚C) K4 (100 ˚C) 166 – 0,881 161 – 0,873 K1, K2: 0,10 mm < s < 2,00 mm K3, K4: 70 nH < AL < 630 nH Siemens Matsushita Components EFD 30/15/9 Accessories B66424 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 Square pins Yoke ● Material: Stainless spring steel (0,45 mm) Coil former Ordering code Sections AN mm2 lN mm AR value µΩ Pins 1 52,3 56,7 37,3 12 Yoke (ordering code per piece, 2 are required) B66424-B1012-D1 B66424-B2000 Coil former Yoke View A Mounting holes Thermosetting plastic Marking of pin 1 CuSn6, tinned Siemens Matsushita Components 557