Surface Mount Toroidal Inductor
The Surface Mount Toroidal Inductors manufactured by Engineered Components Company
are designed for RF/low power applications using stable powdered iron core material.
The fully encapsulated inductor provides a low external magnetic field, a high self-
resonant frequency, and a high Q.
The standard inductance value tolerance is +/-5% when measured at the frequencies
specified in Table 1. Inductance values are measured on an HP 4284A LCR meter.
Since inductance varies with AC/DC current values, each end application should be
evaluated to ensure proper readings. The tabulated current ratings (Rated I
DC
) are those
calculated to cause a 25 deg. C rise in case temperature. These inductors are designed
to meet the applicable portions of MIL-C-15305, Grade 1, Class B. The temperature
coefficient of inductance is less than 400ppm/deg. C over the operating temperature
range of -55 to +125 deg. C. Inductors are capable of withstanding 500Vdc@50 uA
applied between the coil and the case.
The inductor is fully encapsulated in epoxy resin and is housed in a Liquid Crystal
Polymer case, off-white in color. The case dimensions are specified in Table 2. The
case marking is applied by silkscreen using blue epoxy paint. The 4 Phosphor-Bronze
or Beryllium Copper leads are tin-lead plated and the 2 active leads are marked on
the case by the coil emblem.
Product Selection Table
PART
L
SIZE DCR
Q
SRF TYP RATED IDC
.
NUMBER
(uH)
(ohms) (nom) (Mhz)
(mA)
SMT-2.7
2.7
1
0.50
90
93
900
SMT-3.0
3.0
1
0.50
90
87
880
3.3
1
0.50
87
81
860
SMT-3.3
SMT-3.6
3.6
1
0.50
87
76
840
SMT-3.9
3.9
1
0.60
85
71
820
SMT-4.3
4.3
1
0.60
85
67
810
SMT-4.7
4.7
1
0.60
80
63
800
SMT-5.1
5.1
1
0.60
78
60
790
SMT-5.6
5.6
1
0.60
78
57
780
SMT-6.2
6.2
1
0.60
75
54
770
SMT-6.8
6.8
1
0.60
75
51
760
SMT-7.5
7.5
2
0.80
92
48
750
SMT-8.2
8.2
2
0.90
92
45
730
SMT-9.1
9.1
2
0.90
92
42
710
SMT-10
10.0
2
0.90
91
40
690
SMT-11
11.0
2
1.0
91
38
670
SMT-12
12.0
2
1.1
91
36
650
SMT-13
13.0
2
1.1
90
34
630
SMT-15
15.0
2
1.2
90
32
610
SMT-16
16.0
2
1.2
90
30
600
SMT-18
18.0
2
1.3
90
28
590
SMT-20
20.0
2
1.4
90
26
570
SMT-22
22.0
2
1.5
89
24
550
SMT-24
24.0
2
1.5
89
22
540
SMT-27
27.0
2
1.6
88
21
530
SMT-30
30.0
2
1.7
88
20
510
SMT-33
33.0
2
1.8
87
19
500
SMT-36
36.0
2
1.9
85
18
490
SMT-39
39.0
2
2.0
83
17
480
SMT-43
43.0
2
2.1
80
16
470
SMT-47
47.0
2
2.2
76
15
470
SMT-51
51.0
3
2.3
110
14
460
Special modules can often be manufactured to provide for customer specific applications.
SMT-
620
B
A
.025
.020 TYP.
C
L
A
C
L
.010
TYP.
1/2C
C
MADE IN
USA
DATE
CODE
A=WIDTH & LENGTH
B=HEIGHT
C=LEAD SPACING
SIZE
1
2
3
4
5
A
B
C
.250 .200 .150
.300 .200 .200
.350 .275 .250
.400 .275 .300
.500 .275 .400
TABLE 2
Package Sizes
YYWW
INDUCTANCE
TEST
(IN uH)
FREQUENCY
2.7-9.1
7.9MHz
10-91
2.5MHz
100-910
790KHz
1000-1200
250KHz
TABLE 1
Test Frequencies
Product Selection Table (cont.)
PART
L
SIZE DCR
Q
SRF TYP RATED IDC
.
NUMBER
(uH)
(ohms) (nom) (Mhz)
(mA)
SMT-56
56.0
3
2.4
106
13
450
SMT-62
62.0
3
2.6
102
12
440
SMT-68
68.0
3
2.8
98
12
420
SMT-75
75.0
3
3.0
96
11
410
SMT-82
82.0
3
3.2
94
10
400
SMT-91
91.0
3
3.4
92
10
400
SMT-100 100
3
3.6
105
9
380
SMT-110 110
3
3.8
104
9
370
SMT-120 120
3
3.9
103
8
360
SMT-130 130
3
4.0
102
8
350
SMT-150 150
3
4.2
102
7
340
SMT-160 160
3
4.4
101
7
330
SMT-180 180
3
4.8
101
6
330
SMT-200 200
4
5.1
100
6
320
SMT-220 220
4
5.4
100
5
320
SMT-240 240
4
5.7
100
5
320
SMT-270 270
4
3.8
100
5
400
SMT-300 300
4
4.0
100
4
390
SMT-330 330
4
4.2
100
4
380
SMT-360 360
4
4.4
100
4
370
SMT-390 390
4
4.6
99
3
360
SMT-430 430
4
4.8
98
3
350
SMT-470 470
4
5.0
97
3
350
SMT-510 510
4
5.2
95
3
340
SMT-560 560
4
5.5
92
3
330
SMT-620 620
5
5.8
88
2.8
350
SMT-680 680
5
6.2
82
2.6
340
SMT-750 750
5
6.5
75
2.5
330
SMT-820 820
5
6.8
70
2.3
320
SMT-910 910
5
7.1
65
2.2
320
SMT-1000 1000
5
7.5
115
2.1
310
SMT-1200 1200
5
8.2
115
1.8
300
Phone: 805-369-0034
Fax:
805-369-0033
Web: www.ec2.com
engineered components company
A Division of Cornucopia Tool & Plastics, Inc. PO Box 1915, 448 Sherwood Rd., Paso Robles CA 93447
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