TOROIDAL INDUCTORS
 SMPT-XX
Surface Mount Power Toroidal Inductors
- Stable powdered iron cores
- Low external magnetic field
- Low DCR
- High core saturation current
- Operation -55 to +125°C
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 fully encapsulated units with surface mount leads to realize maximum inductance per unit volume.
These toroidal inductors are designed to provide the utmost in versatility for power applications in computers, filters, instruments, missiles, aircraft, business machines, communications equipment and similar type applications. They are designed for printed circuit board applications; package design provides positive standoff to allow solder fillet formation and flush cleaning of solder-flux residue from under the component after the soldering operation.
These inductors are designed
and manufactured to obtain a wide selection of inductance
values in the smallest possible package sizes. Leads are
attached, the toroid is secured to the mounting platform
and the entire assembly is encapsulated with epoxy resin.
Leads are .010 x .070 phosphor-bronze, tin-plated per MIL-P-81728,
semi-bright. Housing material is flameproof Diallyl Phthalate
per ASTM D 5948, Type SDG-F, and the mounting platform is
a liquid crystal polymer, (LCP) plastic. Diallyl Phthalate
can be used continuously at 450°F; LCP can be used continuously
at 280°C (536°F), has a melt point of 335°C
(635°F), and is inherently flame retardant. Both Diallyl
Phthalate and LCP meet the flammability requirements of
UL 94V-0.
These toroidal inductors are
designed to meet the applicable portions of Specification
MIL-PRF-15305, Grade I, Class B; they are designed for -55
to +125°C operation. Inductors are capable of withstanding
500 V DC @ 50 microamps applied between inductor to case.
Standard inductance tolerance is ±10%; however, units can be supplied to closer tolerances on special order. All measurements of inductance are obtained at 1kHz and 1mA rms. Standard inductance values are shown in the following tables. Since inductance varies with AC/DC current values, each end application should be evaluated to ensure proper specification of inductance value. To assist in selecting optimal inductance during prototyping and breadboarding, toroid inductor kits are available. Inductance is measured on HP 4262A and 4284A/42841A LCR Meters. Tabulated current ratings are those calculated to cause a 40°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 Laser Label. Coil termination occurs at lead centered under label and at lead opposite. Leads at 90o locations are no-connection mounting leads.
PART NUMBER TABLE
PART
NUMBER |
*L
(uH) |
A |
B |
C |
DCR
(ohms) |
RATED
Idc
(Amps) |
Idc for
10% drop
in L
(Amps) |
Idc for
20% drop
in L
(Amps) |
Idc for
30% drop
in L
(Amps) |
| SMPT-1.8 |
1.8 |
0.315 |
.270 |
0.290 |
.02 |
1.9 |
0.84 |
1.39 |
1.94 |
| SMPT-2.2 |
2.2 |
0.315 |
.270 |
0.290 |
.02 |
1.8 |
0.76 |
1.26 |
1.75 |
| SMPT-2.7 |
2.7 |
0.415 |
.320 |
0.390 |
.03 |
2.4 |
1.43 |
2.39 |
3.32 |
| SMPT-3.3 |
3.3 |
0.415 |
.320 |
0.390 |
.03 |
2.3 |
1.30 |
2.16 |
3.00 |
| SMPT-3.9 |
3.9 |
0.415 |
.320 |
0.390 |
.03 |
2.2 |
1.19 |
1.99 |
2.76 |
| SMPT-4.7 |
4.7 |
0.415 |
.320 |
0.390 |
.04 |
2.1 |
1.09 |
1.81 |
2.52 |
| SMPT-5.6 |
5.6 |
0.415 |
.320 |
0.390 |
.04 |
2.0 |
0.99 |
1.66 |
2.31 |
| SMPT-6.8 |
6.8 |
0.415 |
.320 |
0.390 |
.04 |
1.9 |
0.90 |
1.50 |
2.09 |
| SMPT-8.2 |
8.2 |
0.415 |
.320 |
0.390 |
.05 |
1.8 |
0.82 |
1.37 |
1.91 |
| SMPT-10 |
10 |
0.415 |
.320 |
0.390 |
.05 |
1.7 |
0.74 |
1.24 |
1.73 |
| SMPT-12 |
12 |
0.470 |
.340 |
0.445 |
.06 |
2.0 |
0.97 |
1.62 |
2.26 |
| SMPT-15 |
15 |
0.470 |
.340 |
0.445 |
.07 |
1.9 |
0.87 |
1.45 |
2.02 |
| SMPT-18 |
18 |
0.470 |
.340 |
0.445 |
.07 |
1.8 |
0.80 |
1.33 |
1.84 |
| SMPT-22 |
22 |
0.570 |
.390 |
0.545 |
.06 |
2.3 |
0.83 |
1.39 |
1.93 |
| SMPT-27 |
27 |
0.570 |
.390 |
0.545 |
.06 |
2.2 |
0.75 |
1.25 |
1.74 |
| SMPT-33 |
33 |
0.620 |
.425 |
0.595 |
.08 |
2.4 |
0.90 |
1.50 |
2.09 |
| SMPT-39 |
39 |
0.620 |
.425 |
0.595 |
.08 |
2.3 |
0.83 |
1.38 |
1.92 |
| SMPT-47 |
47 |
0.620 |
.425 |
0.595 |
.09 |
2.2 |
0.75 |
1.26 |
1.75 |
| SMPT-56 |
56 |
0.670 |
.425 |
0.645 |
.11 |
2.3 |
0.78 |
1.29 |
1.80 |
| SMPT-68 |
68 |
0.607 |
.425 |
0.645 |
.12 |
2.1 |
0.70 |
1.17 |
1.63 |
| SMPT-82 |
82 |
0.670 |
.425 |
0.645 |
.14 |
2.0 |
0.64 |
1.07 |
1.49 |
| SMPT-100 |
100 |
0.670 |
.425 |
0.645 |
.15 |
1.9 |
0.58 |
0.97 |
1.35 |
| SMPT-120 |
120 |
0.820 |
.485 |
0.795 |
.17 |
2.2 |
0.77 |
1.28 |
1.77 |
| SMPT-150 |
150 |
0.820 |
.485 |
0.795 |
.19 |
2.1 |
0.68 |
1.14 |
1.59 |
| SMPT-180 |
180 |
0.820 |
.485 |
0.795 |
.20 |
2.0 |
0.63 |
1.04 |
1.45 |
| SMPT-220 |
220 |
1.070 |
.530 |
1.045 |
.17 |
2.8 |
0.75 |
1.24 |
1.73 |
| SMPT-270 |
270 |
1.070 |
.530 |
1.045 |
.18 |
2.7 |
0.67 |
1.12 |
1.56 |
| SMPT-330 |
330 |
1.070 |
.530 |
1.045 |
.20 |
2.5 |
0.61 |
1.01 |
1.41 |
| SMPT-390 |
390 |
1.188 |
.670 |
1.163 |
.15 |
3.6 |
0.78 |
1.29 |
1.80 |
| SMPT-470 |
470 |
1.188 |
.670 |
1.163 |
.16 |
3.4 |
0.71 |
1.18 |
1.64 |
| SMPT-560 |
560 |
1.370 |
.740 |
1.345 |
.19 |
3.7 |
0.84 |
1.40 |
1.94 |
| SMPT-680 |
680 |
1.370 |
.740 |
1.345 |
.21 |
3.5 |
0.76 |
1.27 |
1.76 |
| SMPT-820 |
820 |
1.688 |
.805 |
1.663 |
.16 |
4.7 |
0.83 |
1.38 |
1.91 |
| SMPT-1000 |
1000 |
1.688 |
.805 |
1.663 |
.18 |
4.4 |
0.75 |
1.25 |
1.73 |
| SMPT-1200 |
1200 |
1.875 |
.835 |
1.850 |
.20 |
4.7 |
0.84 |
1.40 |
1.95 |
| SMPT-1500 |
1500 |
1.875 |
.835 |
1.850 |
.22 |
4.5 |
0.75 |
1.25 |
1.74 |
| SMPT-1800 |
1800 |
1.875 |
.835 |
1.850 |
.25 |
4.3 |
0.69 |
1.14 |
1.59 |
*Nominal L for 0 Idc
ÆRated Idc for a 40°C temperature rise
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