TOROIDAL INDUCTORS
 VSMT-XX
Vertical Surface
Mount Toroidal Inductors
-
Fully encapsulated Surface Mount 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 surface mount 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 surface mount applications; lead design provides 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. Phosphor-bronze surface
mount 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
500V 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
1,000.0 and above |
L
AND Q
TEST FREQUENCY
7.9 MHz
2.5 MHz
790 KHz
250 KHz |
SIZE
1
2
3
4 |
A
.150
.200
.225
.250 |
B
.250
.300
.350
.500 |
C
.260
.310
.360
.510 |
D
.100
.100
.150
.150 |
PART NUMBER TABLE
| PART |
L
|
|
DCR TYP.
|
Q
|
SRF TYP.
|
RATED Idc
|
| NUMBER |
(uH)
|
SIZE
|
(Ohm)
|
Nom.
|
(MHz)
|
(mA)
|
| VSMT-2.7 |
2.7
|
1
|
0.5
|
92
|
91
|
890
|
| VSMT-3.0 |
3.0
|
1
|
0.5
|
92
|
85
|
890
|
| VSMT-3.3 |
3.3
|
1
|
0.5
|
85
|
80
|
890
|
| VSMT-3.6 |
3.6
|
1
|
0.5
|
90
|
75
|
890
|
| VSMT-3.9 |
3.9
|
1
|
0.6
|
85
|
70
|
820
|
| VSMT-4.3 |
4.3
|
1
|
0.6
|
85
|
66
|
820
|
| VSMT-4.7 |
4.7
|
1
|
0.6
|
80
|
64
|
820
|
| VSMT-5.1 |
5.1
|
1
|
0.6
|
76
|
60
|
820
|
| VSMT-5.6 |
5.6
|
1
|
0.6
|
73
|
57
|
820
|
| VSMT-6.2 |
6.2
|
1
|
0.6
|
78
|
54
|
820
|
| VSMT-6.8 |
6.8
|
1
|
0.6
|
75
|
51
|
760
|
| VSMT-7.5 |
7.5
|
2
|
0.8
|
84
|
48
|
750
|
| VSMT-8.2 |
8.2
|
2
|
0.9
|
85
|
45
|
710
|
| VSMT-9.1 |
9.1
|
2
|
0.9
|
80
|
42
|
710
|
| VSMT-10 |
10
|
2
|
0.9
|
90
|
40
|
710
|
| VSMT-11 |
11
|
2
|
1.0
|
94
|
38
|
670
|
| VSMT-12 |
12
|
2
|
1.1
|
96
|
35
|
640
|
| VSMT-13 |
13
|
2
|
1.1
|
94
|
34
|
640
|
| VSMT-15 |
15
|
2
|
1.2
|
96
|
32
|
610
|
| VSMT-16 |
16
|
2
|
1.2
|
96
|
30
|
610
|
| VSMT-18 |
18
|
2
|
1.3
|
96
|
28
|
590
|
| VSMT-20 |
20
|
2
|
1.4
|
96
|
26
|
570
|
| VSMT-22 |
22
|
2
|
1.5
|
93
|
24
|
550
|
| VSMT-24 |
24
|
2
|
1.5
|
90
|
23
|
550
|
| VSMT-27 |
27
|
2
|
1.6
|
98
|
21
|
530
|
| VSMT-30 |
30
|
2
|
1.7
|
92
|
20
|
510
|
| VSMT-33 |
33
|
2
|
1.8
|
86
|
19
|
500
|
| VSMT-36 |
36
|
2
|
1.9
|
84
|
18
|
490
|
| VSMT-39 |
39
|
2
|
2.0
|
81
|
17
|
470
|
| VSMT-43 |
43
|
2
|
2.0
|
78
|
16
|
470
|
| VSMT-47 |
47
|
2
|
2.2
|
75
|
15
|
450
|
| VSMT-51 |
51
|
3
|
2.5
|
110
|
14
|
450
|
| VSMT-56 |
56
|
3
|
2.4
|
102
|
13
|
460
|
| VSMT-62 |
62
|
3
|
2.6
|
104
|
12
|
440
|
| VSMT-68 |
68
|
3
|
2.9
|
98
|
12
|
420
|
| VSMT-75 |
75
|
3
|
3.0
|
95
|
11
|
410
|
| VSMT-82 |
82
|
3
|
3.1
|
95
|
10
|
400
|
| VSMT-91 |
91
|
3
|
3.2
|
92
|
10
|
400
|
| VSMT-100 |
100
|
3
|
3.3
|
102
|
9.0
|
390
|
| VSMT-110 |
110
|
3
|
3.8
|
105
|
9.0
|
360
|
| VSMT-120 |
120
|
3
|
3.8
|
105
|
8.0
|
360
|
| VSMT-130 |
130
|
3
|
3.9
|
100
|
8.0
|
360
|
| VSMT-150 |
150
|
3
|
4.3
|
103
|
7.0
|
340
|
| VSMT-160 |
160
|
3
|
4.4
|
105
|
7.0
|
340
|
| VSMT-180 |
180
|
3
|
4.9
|
103
|
6.0
|
320
|
| VSMT-200 |
200
|
3
|
5.0
|
100
|
6.0
|
350
|
| VSMT-220 |
220
|
3
|
5.4
|
100
|
5.0
|
330
|
| VSMT-240 |
240
|
3
|
5.7
|
100
|
5.0
|
320
|
| VSMT-270 |
270
|
3
|
3.7
|
110
|
5.0
|
400
|
| VSMT-300 |
300
|
3
|
4.0
|
88
|
4.0
|
390
|
| VSMT-330 |
330
|
3
|
4.1
|
105
|
4.0
|
380
|
| VSMT-360 |
360
|
3
|
4.3
|
110
|
4.0
|
370
|
| VSMT-390 |
390
|
3
|
4.6
|
83
|
3.0
|
360
|
| VSMT-430 |
430
|
3
|
4.8
|
100
|
3.0
|
350
|
| VSMT-470 |
470
|
3
|
5.0
|
90
|
3.0
|
350
|
| VSMT-510 |
510
|
3
|
5.2
|
105
|
3.0
|
340
|
| VSMT-560 |
560
|
3
|
5.5
|
76
|
3.0
|
330
|
| VSMT-620 |
620
|
4
|
5.8
|
78
|
2.8
|
350
|
| VSMT-680 |
680
|
4
|
6.2
|
80
|
2.6
|
340
|
| VSMT-750 |
750
|
4
|
6.4
|
75
|
2.5
|
330
|
| VSMT-820 |
820
|
4
|
6.8
|
65
|
2.3
|
320
|
| VSMT-910 |
910
|
4
|
7.0
|
65
|
2.2
|
320
|
| VSMT-1000 |
1000
|
4
|
7.4
|
110
|
2.1
|
310
|
| VSMT-1100 |
1100
|
4
|
7.8
|
115
|
2.0
|
300
|
| VSMT-1200 |
1200
|
4
|
8.3
|
115
|
1.8
|
290
|
|
