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TOROIDAL IRON CORE INDUCTOR DESIGN
Powdered Iron Toroidal Core Inductor Calculation

Calculation to determine the number of turns required for a range of powdered iron core toroids to achieve a particular inductance value.

 

L =          Inductance in uH

       Inductive index in uH per 100 turns as specified by the manufacturer.

N =         Number of turns.

Example

The number of turns required for a 12uH inductor if the  for the selected powdered iron core is 49 (T-50-2).

 

AL Value

 Mix Type

Size 26 3 15 1 2 7 6 10 12 17 0
T-12 n/a 60 50 48 20 18 17 12 7.5 7.5 3
T-16 145 61 55 44 22 n/a 19 13 8 8 3
T-20 180 76 55 52 27 24 22 16 10 10 3.5
T-25 235 100 85 70 34 29 27 19 12 12 4.5
T-30 325 140 93 85 43 37 36 25 16 16 6
T-37 275 120 90 80 40 32 30 25 15 15 4.9
T-44 360 180 160 105 52 46 42 33 18.5 18.5 6.5
T-50 320 175 135 100 49 43 40 31 18 18 6.4
T-68 420 195 180 115 57 52 47 32 21 21 7.5
T-80 450 180 170 115 55 50 45 32 22 22 8.5
T-94 590 248 200 160 84 n/a 70 58 32 n/a 10.6
T-106 900 450 345 325 135 133 116 n/a n/a n/a 19
T-130 785 3350 250 200 110 103 96 n/a n/a n/a 15
T-157 870 420 360 320 140 n/a 115 n/a n/a n/a n/a
T-184 1640 720 n/a 500 240 n/a 195 n/a n/a n/a n/a
T-200 895 425 n/a 250 120 105 100 n/a n/a n/a n/a

Table of AL values for a selection of powdered iron core toroids.

 

Iron Powder Magnetic Core Dimensions
Size Colour Dimensions
O.D. I.D. HEIGHT
in mm in mm in mm
T-200-2 Red 2 50.80 1.25 31.75 0.55 13.97
T-94-2 Red 0.94 23.88 0.56 14.224 0.31 7.874
T-80-2 Red 0.8 20.32 0.5 12.7 0.25 6.35
T-68-2 Red 0.68 17.27 0.37 9.398 0.19 4.826
T-50-2 Red 0.5 12.70 0.3 7.62 0.19 4.826
T-37-2 Red 0.37 9.40 0.21 5.334 0.12 3.048
T-25-2 Red 0.25 6.35 0.12 3.048 0.09 2.286
T-12-2 Red 0.125 3.18 0.06 1.524 0.05 1.27
T-50-10 Black 0.5 12.70 0.3 7.62 0.19 4.826
T-37-10 Black 0.37 9.40 0.21 5.334 0.12 3.048
T-25-10 Black 0.25 6.35 0.12 3.048 0.09 2.286
T-12-10 Black 0.125 3.18 0.06 1.524 0.05 1.27
T-94-9 Yellow 0.94 23.88 0.56 14.224 0.31 7.874

Table of core dimensions for a selection of powdered iron core toroids.

 

Iron Powder Magnetic Core Properties

Mix Color Material μ Temp  f (MHz) Uses
Stability
(ppm/C)
26 Yellow/White Hydrogen Reduced 75 825 DC -10MHz EMI filters, DC chokes
3 Gray Carbonyl HP 35 370 0.05 - 0.500MHz Exc. stability, good Q at low freq.
15 Red/White Carbonyl GS6 25 190 0.10 - 20MHz Exc. stability, good Q
1 Blue Carbonyl C 20 280 0.50 - 50MHz Exc. stability, good Q at low freq.
2 Red Carbonyl E 10 95 2 - 30MHz High Q
7 White Carbonyl TH 9 30 3 - 35MHz Similar to mix 2 and mix 6, exc. temp stability
6 Yellow Carbonyl SF 8 35 10 - 50MHz Very good Q and temp. stability for 20-50 MHz
10 Black Powdered Iron W 6 150 30 - 1000MHz Good Q and stability for 40-100 MHz
12 Green/White Synthetic Oxide 4 170 50 - 2000MHz Good Q, moderate temp. stability
17 Blue/Yellow Carbonyl 4 50 40 - 1800MHz Similar to mix 12, better temp. stability, Q drops about 10% above 50 MHz, 20% above 100 MHz
0 Tan Phenolic 1 0 100 - 3000MHz L varies greatly with winding technique

Table of core properties for powdered iron core.

 

Iron Powder Core Inductor Design Software: http://www.micrometals.com/material/IPIDsgnSoftwaretxt.html

 

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Page last revised 30 January 2016  
 

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