Amidon IRON POWDER TOROIDAL CORES
Iron Powder Material |
Basic Iron Powder |
Material Permeability
�o |
Temperature Stability
(ppm/�C) |
Resonant
Circuit Frequency Range (MHz) |
Color Code |
0 |
Phenolic |
1 |
0 |
100.0 - 300.0 |
Tan |
1 |
Carbonyl C |
20 |
280 |
0.5 - 5.0 |
Blue |
2 |
Carbonyl E |
10 |
95 |
2.0 - 30.0 |
Red |
3 |
Carbonyl HP |
35 |
370 |
0.05 - 0.5 |
Grey |
6 |
Carbonyl SF |
8 |
35 |
10.0 - 50.0 |
Yellow |
7 |
Carbonyl TH |
9 |
30 |
5.0 - 35.0 |
White |
10 |
Carbonyl W |
6 |
150 |
30.0 - 100.0 |
Black |
12 |
Synthetic Oxide |
4 |
170* |
50.0 - 200.0 |
Green/White |
15 |
Carbonyl GS6 |
25 |
190 |
0.10 - 2.0 |
Red/White |
17 |
Carbonyl |
4 |
50 |
50.00 - 200.0 |
Blue/Yellow |
26 |
Special |
75 |
882 |
LF filters, chokes |
Yellow/White |
Material #17 has been developed as a
temperature stable alternative to the #12.
Frequency ranges shown are for best 'Q'/ Useful over broader frequency
ranges with lower 'Q'.
- MATERIAL #0 (�=1): Most commonly used for frequencies above 100 MHz. Available in
toroidal form only. Note: Due to the nature of this material the inductance resulting from
the use of a given AL value may not be as accurate as we would like. Inductance vs. number
of turns will vary greatly depending upon the winding technique.
- MATERIAL #1 (�=20): A Carbonyl 'C' material, very similar to material #3 except that it
has higher volume resistivity and better stability. Available in toroidal form and
shielded coil form.
- MATERIAL #2 (�=10): A Carbonyl 'E' iron powder material having high volume resistivity.
Offers high 'Q' for the 2 MHz to 20 MHz frequency range. Available in toroidal form and
shielded coil form.
- MATERIAL #3 (�=35): A Carbonyl 'HP' material having excellent stability and good 'Q'
for the lower frequencies from 50 KHz to 500 KHz. Available in toroidal form and shielded
coil form.
- MATERIAL #6 (�=8): A Carbonyl 'SF' material. Offers very good 'Q' and temperature
stability for the 20 to 50 MHz frequency range. Available in both toroidal and shielded
coil form.
- MATERIAL #7 (�=9): A Carbonyl 'TH' material. Very similar to the #2 and #6 materials
but offers better temperature stability than either. Available in both toroidal and
shielded coil form.
- MATERIAL #10 (�=6): A powdered iron 'W' material. Offers good 'Q' and high stability
for frequencies from 40 MHz to 100 MHz. Available in toroidal form and shielded coil form.
- MATERIAL #12 (�=4): A Synthetic oxide material which provides good 'Q' and moderate
stability for frequencies from 50 MHz to 200 MHz. If high 'Q' is of prime importance this
material is a good choice. If stability is of a prime importance, consider the #17
material. The #12 material is available in all sizes up to T-94, in toroidal form. Not
available in shielded coil form.
- MATERIAL #15 (�=25): A carbonyl 'GS6' material. Has excellent stability and good 'Q'. A
good choice for commercial broadcast frequencies where good 'Q' and stability are
essential. Available in toroidal form only.
- MATERIAL #17 (�=4): This is a new carbonyl material which is very similar to the #12
material except tatar it has better temperature stability. However, as compared to the #12
material, there is a slight 'Q' loss of about 10% from 50 MHz to 100 MHz. Above 100 MHz,
the 'Q' will gradually deteriorate to approximately 20% lower. It is available in both
toroidal form and the shielded coil form.
- MATERIAL #26 (�=75): A Hydrogen Reduced material. Has highest permeability of all of
the iron powder materials. Used for EMI filters and DC chokes. The #26 is very similar to
the older #41 material but can provide and extended frequency range. See AC Line Filter
and CD Choke sections for size, permeability and frequency range information.
MATERIAL 0 -- Permeability 1, Freq Range 100 MHz -
300 MHz, Color - Tan
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-0 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
3.0 |
T-16-0 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
3.0 |
T-20-0 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
3.5 |
T-25-0 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
4.5 |
T-30-0 |
.307 |
.151 |
.128 |
1.83 |
.065 |
.119 |
6.0 |
T-37-0 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
4.9 |
T-44-0 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
6.5 |
T-50-0 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
6.4 |
T-68-0 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
7.5 |
T-80-0 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
8.5 |
T-94-0 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
10.6 |
T-106-0 |
1.060 |
.570 |
.437 |
6.50 |
.690 |
4.485 |
19.0 |
T-130-0 |
1.300 |
.780 |
.437 |
8.29 |
.730 |
6.052 |
15.0 |
Note:
Due to the nature of the '0' material, the inductance resulting from the use of the
given AL value may vary greatly depending upon the winding technique. This may
cause discrepancy between calculated and measured inductance.
MATERIAL 1 -- Permeability 20, Freq. Range
0.5 MHz to 5 MHz, Color - Blue
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
X
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-1 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
48 |
T-16-1 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
44 |
T-20-1 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
52 |
T-25-1 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
70 |
T-30-1 |
.307 |
.151 |
.128 |
1.83 |
.065 |
.119 |
85 |
T-37-1 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
80 |
T-44-1 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
105 |
T-50-1 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
100 |
T-68-1 |
.69 |
.370 |
.190 |
4.24 |
.196 |
.831 |
115 |
T-80-1 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
115 |
T-94-1 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
160 |
T-106-1 |
1.060 |
.570 |
.437 |
6.50 |
.690 |
4.485 |
325 |
T-130-1 |
1.300 |
.780 |
.437 |
8.29 |
.730 |
6.052 |
200 |
T-157-1 |
1.570 |
.950 |
.570 |
10.05 |
1.140 |
11.457 |
320 |
T-184-1 |
1.840 |
.950 |
.710 |
11.12 |
2.040 |
22.685 |
500 |
T-200-1 |
2.000 |
1.250 |
.550 |
12.97 |
1.330 |
17.250 |
250 |
Note:
MATERIAL 2 -- Permeability 10, Freq. Range
2 MHz to 30 MHz, Color - Red
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-2 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
20 |
T-16-2 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
22 |
T-20-2 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
25 |
T-25-2 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
34 |
T-30-2 |
.307 |
.151 |
.128 |
1.83 |
.065 |
.119 |
43 |
T-37-2 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
40 |
T-44-2 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
52 |
T-50-2 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
49 |
T-68-2 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
57 |
T-80-2 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
55 |
T-94-2 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
84 |
T-106-2 |
1.060 |
.780 |
.437 |
6.50 |
.690 |
4.485 |
135 |
T-130-2 |
1.300 |
.950 |
.437 |
8.29 |
.730 |
6.052 |
110 |
T-157-2 |
1.570 |
.950 |
.570 |
10.05 |
1.140 |
11.457 |
140 |
T-184-2 |
1.840 |
1.250 |
.710 |
11.12 |
2.040 |
22.685 |
240 |
T-200-2 |
2.000 |
1.250 |
.550 |
12.97 |
1.330 |
17.250 |
120 |
T-200A-2 |
2.000 |
1.405 |
1.000 |
12.97 |
2.240 |
29.050 |
218 |
T-225-2 |
2.250 |
1.485 |
.550 |
14.56 |
1.508 |
21.956 |
120 |
T-225A-2 |
2.250 |
1.250 |
1.000 |
14.56 |
2.730 |
39.749 |
215 |
T-300-2 |
3.058 |
1.925 |
.500 |
19.83 |
1.810 |
35.892 |
114 |
T-300A-2 |
3.048 |
1.925 |
1.000 |
19.83 |
3.580 |
70.991 |
228 |
T-400-2 |
4.000 |
2.250 |
.650 |
24.93 |
3.660 |
91.244 |
180 |
T-400A-2 |
4.000 |
2.250 |
1.300 |
24.93 |
7.432 |
185.250 |
360 |
T-520-2 |
5.200 |
3.080 |
.800 |
33.16 |
5.460 |
181.000 |
207 |
MATERIAL 3 -- Permeability 35, Freq. Range
0.05 MHz to 0.5 MHz, Color - Gray
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-3 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
60 |
T-16-3 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
61 |
T-20-3 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
76 |
T-25-3 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
100 |
T-30-3 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
140 |
T-37-3 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
120 |
T-44-3 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
180 |
T-50-3 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
175 |
T-68-3 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
195 |
T-80-3 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
180 |
T-94-3 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
248 |
T-106-3 |
1.060 |
.570 |
.437 |
6.50 |
.690 |
4.485 |
450 |
T-130-3 |
1.300 |
.780 |
.437 |
8.29 |
.730 |
6.052 |
350 |
T-157-3 |
1.570 |
.950 |
.570 |
10.05 |
1.140 |
11.457 |
420 |
T-184-3 |
1.840 |
.950 |
.710 |
11.12 |
2.040 |
22.685 |
720 |
T-200-3 |
2.000 |
1.250 |
.550 |
12.97 |
1.330 |
17.250 |
425 |
T-200A-3 |
2.000 |
1.250 |
1.000 |
12.97 |
2.240 |
29.050 |
460 |
T-225-3 |
2.250 |
1.405 |
.550 |
14.56 |
1.508 |
21.956 |
425 |
MATERIAL 6-- Permeability 8, Freq. Range
10 MHz to 50 MHz, Color - Yellow
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-6 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
17 |
T-16-6 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
19 |
T-20-6 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
22 |
T-25-6 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
27 |
T-30-6 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
36 |
T-37-6 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
30 |
T-44-6 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
42 |
T-50-6 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
46 |
T-68-6 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
47 |
T-80-6 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
45 |
T-94-6 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
70 |
T-106-6 |
1.060 |
.570 |
.437 |
6.50 |
.690 |
4.485 |
116 |
T-130-6 |
1.300 |
.780 |
.437 |
8.29 |
.730 |
6.052 |
96 |
T-157-6 |
1.570 |
.950 |
.570 |
10.05 |
1.140 |
11.457 |
115 |
T-184-6 |
1.840 |
.950 |
.710 |
11.12 |
2.040 |
22.685 |
195 |
T-200-6 |
2.000 |
1.250 |
.550 |
12.97 |
1.330 |
17.250 |
100 |
T-200A-6 |
2.000 |
1.250 |
1.000 |
12.97 |
2.240 |
29.050 |
180 |
T-225-6 |
2.250 |
1.405 |
.550 |
14.56 |
1.508 |
21.956 |
100 |
MATERIAL 7 -- Permeability 9, Freq. Range
3 MHz to 35 MHz, Color - White
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-25-7 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
29 |
T-37-7 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
32 |
T-50-7 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
43 |
T-68-7 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
52 |
MATERIAL 10-- Permeability 6, Freq. Range
30 MHz to 100 MHz, Color - Black
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-10 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
12 |
T-16-10 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
13 |
T-20-10 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
16 |
T-25-10 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
19 |
T-30-10 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
25 |
T-37-10 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
25 |
T-44-10 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
33 |
T-50-10 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
31 |
T-68-10 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
32 |
T-80-10 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
32 |
T-94-10 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
58 |
MATERIAL 12-- Permeability 4, Freq. Range
50 MHz to 200 MHz, Color - Green & White
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-12 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
7.5 |
T-16-12 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
8.0 |
T-20-12 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
10 |
T-25-12 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
12.0 |
T-30-12 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
16.0 |
T-37-12 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
15.0 |
T-44-12 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
18.5 |
T-50-12 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
18.0 |
T-68-12 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
21.0 |
T-80-12 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
22.0 |
T-94-12 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
32.0 |
MATERIAL 15-- Permeability 25, Freq. Range
0.1 MHz to 2.0 MHz, Color - Red & White
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-15 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
50 |
T-16-15 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
55 |
T-20-15 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
65 |
T-25-15 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
85 |
T-30-15 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
93 |
T-37-15 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
90 |
T-44-15 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
160 |
T-50-15 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
135 |
T-68-15 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
180 |
T-80-15 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
170 |
T-94-15 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
200 |
T-106-15 |
1.060 |
.570 |
.437 |
6.50 |
.690 |
4.485 |
345 |
T-130-15 |
1.300 |
.780 |
.437 |
8.29 |
.730 |
6.052 |
250 |
T-157-15 |
1.570 |
.950 |
.570 |
10.05 |
1.140 |
11.457 |
360 |
MATERIAL 17-- Permeability 4, Freq. Range
20 MHz to 200 MHz, Color - Blue & Yellow
|
Core Number |
O.D.
(inches) |
I.D.
(inches) |
Hgt
(inches) |
le
(cm) |
Ae
(cm)2 |
Ve
(cm)3 |
AL Value
�h/100 Turns |
T-12-17 |
.125 |
.062 |
.050 |
.74 |
.010 |
.007 |
7.5 |
T-16-17 |
.160 |
.078 |
.060 |
.95 |
.016 |
.015 |
8.0 |
T-20-17 |
.200 |
.088 |
.070 |
1.15 |
.025 |
.029 |
10.0 |
T-25-17 |
.255 |
.120 |
.096 |
1.50 |
.042 |
.063 |
12.0 |
T-30-17 |
.307 |
.151 |
.128 |
.183 |
.065 |
.119 |
16.0 |
T-37-17 |
.375 |
.205 |
.128 |
2.32 |
.070 |
.162 |
15.0 |
T-44-17 |
.440 |
.229 |
.159 |
2.67 |
.107 |
.286 |
18.5 |
T-50-17 |
.500 |
.303 |
.190 |
3.03 |
.121 |
.367 |
18.0 |
T-68-17 |
.690 |
.370 |
.190 |
4.24 |
.196 |
.831 |
21.0 |
T-80-17 |
.795 |
.495 |
.250 |
5.15 |
.242 |
1.246 |
32.0 |
T-90-17 |
.942 |
.560 |
.312 |
6.00 |
.385 |
2.310 |
32.0 |