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TOROIDAL FERRITE CORE INDUCTOR DESIGN
Ferrite Toroidal Core Inductor Calculation

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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Page last revised 07 February 2016  
 

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