TOROIDAL INDUCTORS
 VMT-XX
Vertical Mount Toroidal Inductors
- Fully encapsulated design
- High Q
- Low external magnetic field
- Stable powdered iron cores
- High Self-resonant frequency
DESIGN NOTES
Toroidal inductors described in this brochure are manufactured of the highest quality raw materials utilizing powdered iron core material; they are provided as rectangular vertical standing units with round leads to realize maximum inductance per unit volume.
These toroidal inductors are designed to provide the utmost in versatility for RF/low power applications in computers, filters, instruments, missiles, aircraft, business machines, communications equipment and similar type applications. They are designed for printed circuit board applications; standoff feet are provided to provide positive standoff to allow flush cleaning of solder-flux residue from under the component after the soldering operation.
These inductors are designed and manufactured to obtain minimum distributed capacity, maximum Q, and the highest self resonant frequency in the smallest possible package size. Copper leads are attached and the entire unit is encapsulated in the housing with epoxy resin. Leads are tin-lead plated per MIL-P-81728, semi-bright. Housing material is a liquid crystal polymer (LCP) plastic. LCP can be used continuously at 280°C (536°F), has a melt point of 335°C (635°F), is inherently flame retardant and meets the flammability requirements of UL 94V-0.
Maximum
power dissipation is 0.5 Watts. Temperature
coefficient of inductance is less than 400ppm/°C
over the operating temperature range of -55 to +125°C.
Inductors are capable of withstanding 500 V DC @ 50 microamps
applied between inductor to case. Standard inductance tolerance
is ±5%. All measurements of inductance and Q are
obtained at frequencies as specified in Specification MIL-PRF-15305.
Standard inductance values are shown in the following tables.
Tabulated current ratings are those calculated to cause
a 25°C
rise in case temperature.
Marking
consists of manufacturer's logo (EC²), part number,
terminal identification and date code of manufacture. All
marking is applied by silk-screen process using blue epoxy
paint in accordance with MIL-STD-130, to meet the permanency
of identification required by MIL-STD-202, Method 215.
L
(IN uh)
2.7 to 10.0
10.0 to 100.0
100.0 to 1,000.0
1,000 and above |
L
AND Q
TEST FREQUENCY
7.9 MHz
2.5 MHz
790 KHz
250 KHz |
Size
1
2
3
4 |
W
.150
.200
.225
.250 |
L
.250
.300
.350
.500 |
H
.250
.300
.350
.500 |
B
N/A
.150
.150
.150 |
A
.200
.250
.250
.400 |
PART NUMBER TABLE
PART
NUMBER |
L
(uH)
|
SIZE
|
DCR
TYP.
(Ohm)
|
Q
NOM.
|
SRF
TYP.
(MHz)
|
RATED
Idc (mA)
|
| VMT-2.7 |
2.7
|
1
|
0.5
|
92
|
91
|
890
|
| VMT-3.0 |
3.0
|
1
|
0.5
|
92
|
85
|
890
|
| VMT-3.3 |
3.3
|
1
|
0.5
|
85
|
80
|
890
|
| VMT-3.6 |
3.6
|
1
|
0.5
|
90
|
75
|
890
|
| VMT-3.9 |
3.9
|
1
|
0.6
|
85
|
70
|
820
|
| VMT-4.3 |
4.3
|
1
|
0.6
|
85
|
66
|
820
|
| VMT-4.7 |
4.7
|
1
|
0.6
|
80
|
64
|
820
|
| VMT-5.1 |
5.1
|
1
|
0.6
|
76
|
60
|
820
|
| VMT-5.6 |
5.6
|
1
|
0.6
|
73
|
57
|
820
|
| VMT-6.2 |
6.2
|
1
|
0.6
|
78
|
54
|
820
|
| VMT-6.8 |
6.8
|
1
|
0.6
|
75
|
51
|
760
|
| VMT-7.5 |
7.5
|
2
|
0.8
|
84
|
48
|
750
|
| VMT-8.2 |
8.2
|
2
|
0.9
|
85
|
45
|
710
|
| VMT-9.1 |
9.1
|
2
|
0.9
|
80
|
42
|
710
|
| VMT-10 |
10
|
2
|
0.9
|
90
|
40
|
710
|
| VMT-11 |
11
|
2
|
1.0
|
94
|
38
|
670
|
| VMT-12 |
12
|
2
|
1.1
|
96
|
35
|
640
|
| VMT-13 |
13
|
2
|
1.1
|
94
|
34
|
640
|
| VMT-15 |
15
|
2
|
1.2
|
96
|
32
|
610
|
| VMT-16 |
16
|
2
|
1.2
|
96
|
30
|
610
|
| VMT-18 |
18
|
2
|
1.3
|
96
|
28
|
590
|
| VMT-20 |
20
|
2
|
1.4
|
96
|
26
|
570
|
| VMT-22 |
22
|
2
|
1.5
|
93
|
24
|
550
|
| VMT-24 |
24
|
2
|
1.5
|
90
|
23
|
550
|
| VMT-27 |
27
|
2
|
1.6
|
98
|
21
|
530
|
| VMT-30 |
30
|
2
|
1.7
|
92
|
20
|
510
|
| VMT-33 |
33
|
2
|
1.8
|
86
|
19
|
500
|
| VMT-36 |
36
|
2
|
1.9
|
84
|
18
|
490
|
| VMT-39 |
39
|
2
|
2.0
|
81
|
17
|
470
|
| VMT-43 |
43
|
2
|
2.0
|
78
|
16
|
470
|
| VMT-47 |
47
|
2
|
2.2
|
75
|
15
|
450
|
| VMT-51 |
51
|
3
|
2.5
|
110
|
14
|
450
|
| VMT-56 |
56
|
3
|
2.4
|
102
|
13
|
460
|
| VMT-62 |
62
|
3
|
2.6
|
104
|
12
|
440
|
| VMT-68 |
68
|
3
|
2.9
|
98
|
12
|
420
|
| VMT-75 |
75
|
3
|
3.0
|
95
|
11
|
410
|
| VMT-82 |
82
|
3
|
3.1
|
95
|
10
|
400
|
| VMT-91 |
91
|
3
|
3.2
|
92
|
10
|
400
|
| VMT-100 |
100
|
3
|
3.3
|
102
|
9.0
|
390
|
| VMT-110 |
110
|
3
|
3.8
|
105
|
9.0
|
360
|
| VMT-120 |
120
|
3
|
3.8
|
105
|
8.0
|
360
|
| VMT-130 |
130
|
3
|
3.9
|
100
|
8.0
|
360
|
| VMT-150 |
150
|
3
|
4.3
|
103
|
7.0
|
340
|
| VMT-160 |
160
|
3
|
4.4
|
105
|
7.0
|
340
|
| VMT-180 |
180
|
3
|
4.9
|
103
|
6.0
|
320
|
| VMT-200 |
200
|
3
|
5.0
|
100
|
6.0
|
350
|
| VMT-220 |
220
|
3
|
5.4
|
100
|
5.0
|
330
|
| VMT-240 |
240
|
3
|
5.7
|
100
|
5.0
|
320
|
| VMT-270 |
270
|
3
|
3.7
|
110
|
5.0
|
400
|
| VMT-300 |
300
|
3
|
4.0
|
88
|
4.0
|
390
|
| VMT-330 |
330
|
3
|
4.1
|
105
|
4.0
|
380
|
| VMT-360 |
360
|
3
|
4.3
|
110
|
4.0
|
370
|
| VMT-390 |
390
|
3
|
4.6
|
83
|
3.0
|
360
|
| VMT-430 |
430
|
3
|
4.8
|
100
|
3.0
|
350
|
| VMT-470 |
470
|
3
|
5.0
|
90
|
3.0
|
350
|
| VMT-510 |
510
|
3
|
5.2
|
105
|
3.0
|
340
|
| VMT-560 |
560
|
3
|
5.5
|
76
|
3.0
|
330
|
| VMT-620 |
620
|
4
|
5.8
|
78
|
2.8
|
350
|
| VMT-680 |
680
|
4
|
6.2
|
80
|
2.6
|
340
|
| VMT-750 |
750
|
4
|
6.4
|
75
|
2.5
|
330
|
| VMT-820 |
820
|
4
|
6.8
|
65
|
2.3
|
320
|
| VMT-910 |
910
|
4
|
7.0
|
65
|
2.2
|
320
|
| VMT-1000 |
1000
|
4
|
7.4
|
110
|
2.1
|
310
|
| VMT-1100 |
1100
|
4
|
7.8
|
115
|
2.0
|
300
|
| VMT-1200 |
1200
|
4
|
8.3
|
115
|
1.8
|
290
|
|
