Iron Powder Toroidal Cores (for resonant circuits)

IRON POWDER TOROIDAL CORES
(For Resonant Circuits)

**MATERIAL 0** -- Permeability 1, Freq Range 100 MHz - 300 MHz, Color - Tan
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-0	.125	.062	.050	.74	.010	.007	3.0
T16-0	.160	.078	.060	.95	.016	.015	3.0
T20-0	.200	.088	.070	1.15	.025	.029	3.5
T25-0	.255	.120	.096	1.50	.042	.063	4.5
T30-0	.307	.151	.128	1.83	.065	.119	6.0
T37-0	.375	.205	.128	2.32	.070	.162	4.9
T44-0	.440	.229	.159	2.67	.107	.286	6.5
T50-0	.500	.303	.190	3.03	.121	.367	6.4
T68-0	.690	.370	.190	4.24	.196	.831	7.5
T80-0	.795	.495	.250	5.15	.242	1.246	8.5
T94-0	.942	.560	.312	6.00	.385	2.310	10.6
T106-0	1.060	.570	.437	6.50	.690	4.485	19.0
T130-0	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 A_L value may vary greatly depending upon the winding technique. This may cause discrepancy between calculated and measured inductance.

Table of Contents

Materials

Order information

**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)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-1	.125	.062	.050	.74	.010	.007	48
T16-1	.160	.078	.060	.95	.016	.015	44
T20-1	.200	.088	.070	1.15	.025	.029	52
T25-1	.255	.120	.096	1.50	.042	.063	70
T30-1	.307	.151	.128	1.83	.065	.119	85
T37-1	.375	.205	.128	2.32	.070	.162	80
T44-1	.440	.229	.159	2.67	.107	.286	105
T50-1	.500	.303	.190	3.03	.121	.367	100
T68-1	.69	.370	.190	4.24	.196	.831	115
T80-1	.795	.495	.250	5.15	.242	1.246	115
T94-1	.942	.560	.312	6.00	.385	2.310	160
T106-1	1.060	.570	.437	6.50	.690	4.485	325
T130-1	1.300	.780	.437	8.29	.730	6.052	200
T157-1	1.570	.950	.570	10.05	1.140	11.457	320
T184-1	1.840	.950	.710	11.12	2.040	22.685	500
T200-1	2.000	1.250	.550	12.97	1.330	17.250	250

Note:

Most cores can be very useful well below the lower frequency limits shown here.

Table of Contents

Ordering information

**MATERIAL 2** -- Permeability 10, Freq. Range 2 MHz to 30 MHz, Color - Red
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-2	.125	.062	.050	.74	.010	.007	20
T16-2	.160	.078	.060	.95	.016	.015	22
T20-2	.200	.088	.070	1.15	.025	.029	25
T25-2	.255	.120	.096	1.50	.042	.063	34
T30-2	.307	.151	.128	1.83	.065	.119	43
T37-2	.375	.205	.128	2.32	.070	.162	40
T44-2	.440	.229	.159	2.67	.107	.286	52
T50-2	.500	.303	.190	3.03	.121	.367	49
T68-2	.690	.370	.190	4.24	.196	.831	57
T80-2	.795	.495	.250	5.15	.242	1.246	55
T94-2	.942	.560	.312	6.00	.385	2.310	84
T106-2	1.060	.780	.437	6.50	.690	4.485	135
T130-2	1.300	.950	.437	8.29	.730	6.052	110
T157-2	1.570	.950	.570	10.05	1.140	11.457	140
T184-2	1.840	1.250	.710	11.12	2.040	22.685	240
T200-2	2.000	1.250	.550	12.97	1.330	17.250	120
T200A-2	2.000	1.405	1.000	12.97	2.240	29.050	218
T225-2	2.250	1.485	.550	14.56	1.508	21.956	120
T225A-2	2.250	1.250	1.000	14.56	2.730	39.749	215
T300-2	3.058	1.925	.500	19.83	1.810	35.892	114
T300A-2	3.048	1.925	1.000	19.83	3.580	70.991	228
T400-2	4.000	2.250	.650	24.93	3.660	91.244	180
T400A-2	4.000	2.250	1.300	24.93	7.432	185.250	360
T520-2	5.200	3.080	.800	33.16	5.460	181.000	207

Table of Contents

Ordering information

**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)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-3	.125	.062	.050	.74	.010	.007	60
T16-3	.160	.078	.060	.95	.016	.015	61
T20-3	.200	.088	.070	1.15	.025	.029	76
T25-3	.255	.120	.096	1.50	.042	.063	100
T30-3	.307	.151	.128	.183	.065	.119	140
T37-3	.375	.205	.128	2.32	.070	.162	120
T44-3	.440	.229	.159	2.67	.107	.286	180
T50-3	.500	.303	.190	3.03	.121	.367	175
T68-3	.690	.370	.190	4.24	.196	.831	195
T80-3	.795	.495	.250	5.15	.242	1.246	180
T94-3	.942	.560	.312	6.00	.385	2.310	248
T106-3	1.060	.570	.437	6.50	.690	4.485	450
T130-3	1.300	.780	.437	8.29	.730	6.052	350
T157-3	1.570	.950	.570	10.05	1.140	11.457	420
T184-3	1.840	.950	.710	11.12	2.040	22.685	720
T200-3	2.000	1.250	.550	12.97	1.330	17.250	425
T200A-3	2.000	1.250	1.000	12.97	2.240	29.050	460
T225-3	2.250	1.405	.550	14.56	1.508	21.956	425

Table of Contents

Ordering information

**MATERIAL 6**-- Permeability 8, Freq. Range 10 MHz to 50 MHz, Color - Yellow
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-6	.125	.062	.050	.74	.010	.007	17
T16-6	.160	.078	.060	.95	.016	.015	19
T20-6	.200	.088	.070	1.15	.025	.029	22
T25-6	.255	.120	.096	1.50	.042	.063	27
T30-6	.307	.151	.128	.183	.065	.119	36
T37-6	.375	.205	.128	2.32	.070	.162	30
T44-6	.440	.229	.159	2.67	.107	.286	42
T50-6	.500	.303	.190	3.03	.121	.367	46
T68-6	.690	.370	.190	4.24	.196	.831	47
T80-6	.795	.495	.250	5.15	.242	1.246	45
T94-6	.942	.560	.312	6.00	.385	2.310	70
T106-6	1.060	.570	.437	6.50	.690	4.485	116
T130-6	1.300	.780	.437	8.29	.730	6.052	96
T157-6	1.570	.950	.570	10.05	1.140	11.457	115
T184-6	1.840	.950	.710	11.12	2.040	22.685	195
T200-6	2.000	1.250	.550	12.97	1.330	17.250	100
T200A-6	2.000	1.250	1.000	12.97	2.240	29.050	180
T225-6	2.250	1.405	.550	14.56	1.508	21.956	100

Table of Contents

Ordering information

**MATERIAL 7** -- Permeability 9, Freq. Range 3 MHz to 35 MHz, Color - White
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T25-7	.255	.120	.096	1.50	.042	.063	29
T37-7	.375	.205	.128	2.32	.070	.162	32
T50-7	.500	.303	.190	3.03	.121	.367	43
T68-7	.690	.370	.190	4.24	.196	.831	52

Table of Contents

Ordering information

**MATERIAL 10**-- Permeability 6, Freq. Range 30 MHz to 100 MHz, Color - Black
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-10	.125	.062	.050	.74	.010	.007	12
T16-10	.160	.078	.060	.95	.016	.015	13
T20-10	.200	.088	.070	1.15	.025	.029	16
T25-10	.255	.120	.096	1.50	.042	.063	19
T30-10	.307	.151	.128	.183	.065	.119	25
T37-10	.375	.205	.128	2.32	.070	.162	25
T44-10	.440	.229	.159	2.67	.107	.286	33
T50-10	.500	.303	.190	3.03	.121	.367	31
T68-10	.690	.370	.190	4.24	.196	.831	32
T80-10	.795	.495	.250	5.15	.242	1.246	32
T94-10	.942	.560	.312	6.00	.385	2.310	58

Table of Contents

Ordering information

**MATERIAL 12**-- Permeability 4, Freq. Range 50 MHz to 200 MHz, Color - Green & White
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-12	.125	.062	.050	.74	.010	.007	7.5
T16-12	.160	.078	.060	.95	.016	.015	8.0
T20-12	.200	.088	.070	1.15	.025	.029	10
T25-12	.255	.120	.096	1.50	.042	.063	12.0
T30-12	.307	.151	.128	.183	.065	.119	16.0
T37-12	.375	.205	.128	2.32	.070	.162	15.0
T44-12	.440	.229	.159	2.67	.107	.286	18.5
T50-12	.500	.303	.190	3.03	.121	.367	18.0
T68-12	.690	.370	.190	4.24	.196	.831	21.0
T80-12	.795	.495	.250	5.15	.242	1.246	22.0
T94-12	.942	.560	.312	6.00	.385	2.310	32.0

Table of Contents

Ordering information

**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)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-15	.125	.062	.050	.74	.010	.007	50
T16-15	.160	.078	.060	.95	.016	.015	55
T20-15	.200	.088	.070	1.15	.025	.029	65
T25-15	.255	.120	.096	1.50	.042	.063	85
T30-15	.307	.151	.128	.183	.065	.119	93
T37-15	.375	.205	.128	2.32	.070	.162	90
T44-15	.440	.229	.159	2.67	.107	.286	160
T50-15	.500	.303	.190	3.03	.121	.367	135
T68-15	.690	.370	.190	4.24	.196	.831	180
T80-15	.795	.495	.250	5.15	.242	1.246	170
T94-15	.942	.560	.312	6.00	.385	2.310	200
T106-15	1.060	.570	.437	6.50	.690	4.485	345
T130-15	1.300	.780	.437	8.29	.730	6.052	250
T157-15	1.570	.950	.570	10.05	1.140	11.457	360

Table of Contents

Ordering information

**MATERIAL 17**-- Permeability 4, Freq. Range 20 MHz to 200 MHz, Color - Blue & Yellow
Core Number	O.D. (inches)	I.D. (inches)	Hgt (inches)	l_e(cm)	A_e(cm)²	V_e(cm)³	A_L Value µh/100 Turns
T12-17	.125	.062	.050	.74	.010	.007	7.5
T16-17	.160	.078	.060	.95	.016	.015	8.0
T20-17	.200	.088	.070	1.15	.025	.029	10.0
T25-17	.255	.120	.096	1.50	.042	.063	12.0
T30-17	.307	.151	.128	.183	.065	.119	16.0
T37-17	.375	.205	.128	2.32	.070	.162	15.0
T44-17	.440	.229	.159	2.67	.107	.286	18.5
T50-17	.500	.303	.190	3.03	.121	.367	18.0
T68-17	.690	.370	.190	4.24	.196	.831	21.0
T80-17	.795	.495	.250	5.15	.242	1.246	32.0
T90-17	.942	.560	.312	6.00	.385	2.310	32.0

Table of Contents

Ordering information

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