EFD Cores (8978202021)
Part Number: 8978202021
78 EFD CORE SET
EFD (Economical Flat Design) cores have been designed to maximize volume in a low profile geometry. EFD cores allow
maximum throughput power density with reasonably low mass for board level installation.
EFD cores can be supplied with the center post gapped to a mechanical dimension or an A
L
value.
Weight indicated is per pair or set.
Weight: 7 (g)
Chart Legend
Σl/ 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) 1200 ±25%
Ae(cm
2
) 0.31
Σl/ A(cm
-1
) 15.6
l
e
(cm) 4.74
V
e
(cm
3
) 1.44
A
min
(cm
2
) 0.29
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 20 ± 0.55 0.787 _
B 10 ± 0.25 0.394 _
C 6.65 ± 0.20 0.262 _
D 7.7 ± 0.25 0.303 _
E 15.4 ± 0.50 0.606 _
F 8.9 ± 0.30 0.35 _
K 3.6 ± 0.15 0.142 _
