TOROIDAL INDUCTORS
 SMT-XX
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 square low silhouette 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. Tinned
phosphor-bronze surface mount leads are attached and the
entire unit is encapsulated in the housing with epoxy resin.
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
5 |
A
.250
.300
.350
.400
.500 |
B
.200
.200
.275
.275
.275 |
C
.150
.200
.250
.300
.400 |
PART NUMBER TABLE
| PART |
L
|
|
DCR TYP. |
Q
|
SRF
TYP.
|
RATED Idc |
|
NUMBER
|
(uH)
|
SIZE
|
(Ohm)
|
NOM.
|
(MHz)
|
(mA) |
| SMT-2.7 |
2.7 |
1 |
0.5 |
92 |
91 |
890 |
| SMT-3.0 |
3.0 |
1 |
0.5 |
92 |
85 |
890 |
| SMT-3.3 |
3.3 |
1 |
0.5 |
85 |
80 |
890 |
| SMT-3.6 |
3.6 |
1 |
0.5 |
90 |
75 |
890 |
| SMT-3.9 |
3.9 |
1 |
0.6 |
85 |
70 |
820 |
| SMT-4.3 |
4.3 |
1 |
0.6 |
85 |
66 |
820 |
| SMT-4.7 |
4.7 |
1 |
0.6 |
80 |
64 |
820 |
| SMT-5.1 |
5.1 |
1 |
0.6 |
76 |
60 |
820 |
| SMT-5.6 |
5.6 |
1 |
0.6 |
73 |
57 |
820 |
| SMT-6.2 |
6.2 |
1 |
0.6 |
78 |
54 |
820 |
| SMT-6.8 |
6.8 |
1 |
0.6 |
75 |
51 |
760 |
|
| SMT-7.5 |
7.5 |
2 |
0.8 |
84 |
48 |
750 |
| SMT-8.2 |
8.2 |
2 |
0.9 |
85 |
45 |
710 |
| SMT-9.1 |
9.1 |
2 |
0.9 |
80 |
42 |
710 |
| SMT-10 |
10 |
2 |
0.9 |
90 |
40 |
710 |
| SMT-11 |
11 |
2 |
1.0 |
94 |
38 |
670 |
| SMT-12 |
12 |
2 |
1.1 |
96 |
35 |
640 |
| SMT-13 |
13 |
2 |
1.1 |
94 |
34 |
640 |
| SMT-15 |
15 |
2 |
1.2 |
96 |
32 |
610 |
| SMT-16 |
16 |
2 |
1.2 |
96 |
30 |
610 |
| SMT-18 |
18 |
2 |
1.3 |
96 |
28 |
590 |
| SMT-20 |
20 |
2 |
1.4 |
96 |
26 |
570 |
| SMT-22 |
22 |
2 |
1.5 |
93 |
24 |
550 |
| SMT-24 |
24 |
2 |
1.5 |
90 |
23 |
550 |
| SMT-27 |
27 |
2 |
1.6 |
98 |
21 |
530 |
| SMT-30 |
30 |
2 |
1.7 |
92 |
20 |
510 |
| SMT-33 |
33 |
2 |
1.8 |
86 |
19 |
500 |
| SMT-36 |
36 |
2 |
1.9 |
84 |
18 |
490 |
| SMT-39 |
39 |
2 |
2.0 |
81 |
17 |
470 |
| SMT-43 |
43 |
2 |
2.0 |
78 |
16 |
470 |
| SMT-47 |
47 |
2 |
2.2 |
75 |
15 |
450 |
|
| SMT-51 |
51 |
3 |
2.5 |
110 |
14 |
450 |
| SMT-56 |
56 |
3 |
2.4 |
102 |
13 |
460 |
| SMT-62 |
62 |
3 |
2.6 |
104 |
12 |
440 |
| SMT-68 |
68 |
3 |
2.9 |
98 |
12 |
420 |
| SMT-75 |
75 |
3 |
3.0 |
95 |
11 |
410 |
| SMT-82 |
82 |
3 |
3.1 |
95 |
10 |
400 |
| SMT-91 |
91 |
3 |
3.2 |
92 |
10 |
400 |
| SMT-100 |
100 |
3 |
3.3 |
102 |
9.0 |
390 |
| SMT-110 |
110 |
3 |
3.8 |
105 |
9.0 |
360 |
| SMT-120 |
120 |
3 |
3.8 |
105 |
8.0 |
360 |
| SMT-130 |
130 |
3 |
3.9 |
100 |
8.0 |
360 |
| SMT-150 |
150 |
3 |
4.3 |
103 |
7.0 |
340 |
| SMT-160 |
160 |
3 |
4.4 |
105 |
7.0 |
340 |
| SMT-180 |
180 |
3 |
4.9 |
103 |
6.0 |
320 |
|
| SMT-200 |
200 |
4 |
5.0 |
100 |
6.0 |
350 |
| SMT-220 |
220 |
4 |
5.4 |
100 |
5.0 |
330 |
| SMT-240 |
240 |
4 |
5.7 |
100 |
5.0 |
320 |
| SMT-270 |
270 |
4 |
3.7 |
110 |
5.0 |
400 |
| SMT-300 |
300 |
4 |
4.0 |
88 |
4.0 |
390 |
| SMT-330 |
330 |
4 |
4.1 |
105 |
4.0 |
380 |
| SMT-360 |
360 |
4 |
4.3 |
110 |
4.0 |
370 |
| SMT-390 |
390 |
4 |
4.6 |
83 |
3.0 |
360 |
| SMT-430 |
430 |
4 |
4.8 |
100 |
3.0 |
350 |
| SMT-470 |
470 |
4 |
5.0 |
90 |
3.0 |
350 |
| SMT-510 |
510 |
4 |
5.2 |
105 |
3.0 |
340 |
| SMT-560 |
560 |
4 |
5.5 |
76 |
3.0 |
330 |
|
| SMT-620 |
620 |
5 |
5.8 |
78 |
2.8 |
350 |
| SMT-680 |
680 |
5 |
6.2 |
80 |
2.6 |
340 |
| SMT-750 |
750 |
5 |
6.4 |
75 |
2.5 |
330 |
| SMT-820 |
820 |
5 |
6.8 |
65 |
2.3 |
320 |
| SMT-910 |
910 |
5 |
7.0 |
65 |
2.2 |
320 |
| SMT-1000 |
1000 |
5 |
7.4 |
110 |
2.1 |
310 |
| SMT-1100 |
1100 |
5 |
7.8 |
115 |
2.0 |
300 |
| SMT-1200 |
1200 |
5 |
8.3 |
115 |
1.8 |
290 |
|
