planar cores (7898400321) part number: 7898400321 98 planar ei core set planar ee and ei cores, with their low profile are suitable for board level installation allowing assembly without the need for plastic coilformers and can also allow windings integrated into multi- level pcbs. planar er cores with their low mass and low profile are suitable for surface mount installations in low power filter and transformer applications. planar ee, er and ei cores can be supplied with the center post gapped to a mechanical dimension, or an a l value. catalog drawing 3d model weight: 10.5 (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) 5500 25% ae(cm 2 ) 0.79 l/ a(cm -1 ) 3.3 l e (cm) 2.61 v e (cm 3 ) 2.06 a min (cm 2 ) 0.79 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 21.8 0.40 0.858 _ b 5.7 0.15 0.224 _ c 15.8 0.35 0.622 _ d 3.2 0.15 0.126 _ e 16.8 0.40 0.661 _ f 5 0.20 0.197 _ g 2.5 0.15 0.098 _
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