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TOROIDAL
FERRITE CORE INDUCTOR DESIGN
Ferrite
Toroidal Core Inductor Calculation.
HOME >
OPERATIONAL
>REFERENCES >
Calculation
to determine the number of turns required for a range of ferrite core toroids to achieve a particular inductance value.
L =
Inductance in mH
 =
Inductive index in mH per 100 turns as specified by the
manufacturer.
N =
Number of turns.
Example
The number of turns required for a 1.2mH
inductor if the
for
the selected ferrite core is 150.
|
Core
Number vs AL
Value (nH/t2)
Note: AL
Value +/- 20-30%
|
|
Core
Number
|
Material
( )
|
|
43
|
61
|
63
|
67
|
68
|
72
|
75
|
77
|
F
|
J
|
W
|
H
|
|
FT-23-(
)
|
165
|
25
|
*
|
7.8
|
4
|
*
|
990
|
356
|
*
|
*
|
*
|
*
|
|
FT-37-(
)
|
375
|
55.3
|
*
|
19.7
|
8.8
|
*
|
2110
|
884
|
*
|
*
|
*
|
*
|
|
FT-50-(
)
|
470
|
68
|
*
|
22
|
11
|
1100
|
*
|
990
|
*
|
2750
|
5430
|
8140
|
|
FT-50A-(
)
|
510
|
75
|
*
|
24
|
12
|
*
|
*
|
1080
|
*
|
2990
|
*
|
*
|
|
FT-50B-(
)
|
1025
|
150
|
*
|
48
|
24
|
*
|
*
|
2160
|
*
|
*
|
*
|
*
|
|
FT-82-(
)
|
500
|
75
|
*
|
22.4
|
11.7
|
*
|
*
|
1060
|
*
|
*
|
*
|
*
|
|
FT-87-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
3020
|
6040
|
9060
|
|
FT-87A-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
3624
|
6040
|
12080
|
18100
|
|
FT-114-(
)
|
540
|
79.3
|
*
|
25.4
|
12.7
|
*
|
*
|
1270
|
1902
|
3170
|
*
|
*
|
|
FT-114A-(
)
|
*
|
146
|
*
|
*
|
*
|
*
|
*
|
2340
|
*
|
*
|
*
|
*
|
|
FT-140-(
)
|
952
|
140
|
*
|
45
|
*
|
*
|
*
|
2250
|
*
|
*
|
*
|
*
|
|
FT-140A-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
6736
|
*
|
*
|
|
FT-150-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
2640
|
4400
|
*
|
*
|
|
FT-150A-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
5020
|
8365
|
*
|
*
|
|
FT-193-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
3640
|
6065
|
*
|
*
|
|
FT-193A-(
)
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
*
|
4460
|
7435
|
*
|
*
|
|
FT-240-(
)
|
1160
|
173
|
53
|
53
|
*
|
*
|
*
|
2725
|
*
|
6845
|
*
|
*
|
Table of AL values for a selection of
ferrite
core toroids.
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OF PAGE
Page
last revised 05 May, 2025
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