eer cores (9578261802) part number: 9578261802 78 eer core set eer cores, similar to etd cores, have been designed to make optimum use of a given volume of ferrite material for maximum throughput power. the structure, which includes a round center post, approaches a nearly uniform cross- sectional area throughout the core and provides a winding area that minimizes winding losses. eer cores can be supplied with the center post gapped to a mechanical dimension or an a l value. catalog drawing 3d model weight indicated is per pair or set. weight: 11.2 (g) chart legend l/ a ?: ?core constant,??? l e ?: ?effective path length,??? a e ?: ?effective cross- sectional area,??? v e ?: ?effective core volume a l ?: ?inductance factor ? explanation of part numbers: digits 1 & 2 = product class and 3 & 4 = material grade. electrical properties a l (nh) 1800 25% ae(cm 2 ) 0.434 l/ a(cm -1 ) 11.1 l e (cm) 4.8 v e (cm 3 ) 2.083 a min (cm 2 ) 0.425 a l value is measured at 1 khz, b < 10 gauss. fair- rite products corp.?? ? ??one commercial row, wallkill, new york 12589-0288 888-324-7748 ?? ? ?? 845-895-2055 ?? ? ?? fax: 845-895-2629 ?? ? ?? ferrites@fair- rite.com ?? ? ??www.fair- rite.com dim mm mm tol nominal inch inch misc. a 25.5 0.50 1.004 _ b 9.3 0.15 0.366 _ c 7.5 0.25 0.295 _ d 6.4 0.15 0.252 _ e 19.8 min 0.78 min f 7.5 0.25 0.295 _
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