

Toroids: Powdered Iron  Use the table below to calculate inductance and number of turns per the following formulas.
 Where:
 L = inductance in µH A_{L} = µH per 100 turns N = number of full turns 
Size  26  3  15  1  2  7  6  10  12  17  0  T12  n/a  60  50  48  20  18  17  12  7.5  7.5  3.0  T16  145  61  55  44  22  n/a  19  13  8.0  8.0  3.0  T20  180  76  55  52  27  24  22  16  10  10  3.5  T25  235  100  85  70  34  29  27  19  12  12  4.5  T30  325  140  93  85  43  37  36  25  16  16  6.0  T37  275  120  90  80  40  32  30  25  15  15  4.9  T44  360  180  160  105  52  46  42  33  18.5  18.5  6.5  T50  320  175  135  100  49  43  40  31  18  18  6.4  T68  420  195  180  115  57  52  47  32  21  21  7.5  T80  450  180  170  115  55  50  45  32  22  22  8.5  T94  590  248  200  160  84  n/a  70  58  32  n/a  10.6  T106  900  450  345  325  135  133  116  n/a  n/a  n/a  19  T130  785  3350  250  200  110  103  96  n/a  n/a  n/a  15  T157  870  420  360  320  140  n/a  115  n/a  n/a  n/a  n/a  T184  1640  720  n/a  500  240  n/a  195  n/a  n/a  n/a  n/a  T200  895  425  n/a  250  120  105  100  n/a  n/a  n/a  n/a 
26  Yellow/White  Hydrogen Reduced  75  825  DC 1  EMI filters, DC chokes  3  Gray  Carbonyl HP  35  370  0.05  0.50  Exc. stability, good Q at low freq.  15  Red/White  Carbonyl GS6  25  190  0.10  2  Exc. stability, good Q  1  Blue  Carbonyl C  20  280  0.50  5  Exc. stability, good Q at low freq.  2  Red  Carbonyl E  10  95  2 30  High Q  7  White  Carbonyl TH  9  30  3  35  Similar to mix 2 and mix 6, exc. temp stability  6  Yellow  Carbonyl SF  8  35  10 50  Very good Q and temp. stability for 2050 MHz  10  Black  Powdered Iron W  6  150  30  100  Good Q and stability for 40100 MHz  12  Green/White  Synthetic Oxide  4  170  50  200  Good Q, moderate temp. stability  17  Blue/Yellow  Carbonyl  4  50  40  180  Similar to mix 12, better temp. stability, Q drops about 10% above 50 MHz, 20% above 100 MHz  0  Tan  Phenolic  1  0  100  300  L varies greatly with winding technique 

Size  Color  Dimensions (in)  O.D.  I.D.  Height  T2002  Red  2.00  1.25  0.55  T942  Red  0.94  0.56  0.31  T802  Red  0.80  0.50  0.25  T682  Red  0.68  0.37  0.19  T502  Red  0.50  0.30  0.19  T372  Red  0.37  0.21  0.12  T252  Red  0.25  0.12  0.09  T122  Red  0.125  0.06  0.05  T5010  Black  0.50  0.30  0.19  T3710  Black  0.37  0.21  0.12  T2510  Black  0.25  0.12  0.09  T1210  Black  0.125  0.06  0.05  T949  Yellow  0.94  0.56  0.31  T806  Yellow  0.80  0.50  0.25  T686  Yellow  0.68  0.37  0.19  T506  Yellow  0.50  0.30  0.19  T266  Yellow  0.25  0.12  0.09  T126  Yellow  0.125  0.06  0.05 

 






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