620 NORTH LINDENWOOD, OLATHE, KANSAS 66062
www.torotelproducts.com (913) 747-6111 FAX (913) 747-6110
COMMON MODE INDUCTORS FOR EMI/RFI APPLICATIONS
Common Mode Inductors are most often used to eliminate line
transmitted noise, such as that caused by transistors, SCR’s,
etc., in switch mode regulated power supplies. Interference
caused by multiple equipment on a common power line can be
minimized by the “split-winding” design, thus reducing the inherent
conducted noise to an acceptable level.
EMI COMMON MODE
SUPPRESSION
1 INDUCTOR 2
Power
Source
3
L1
4
C1
L2
C3
SMPS
L3
C2
•
Maximum operating temperature:
130 ºC.
(ambient + temperature rise)
•
Dielectric strength:
1500 Vrms
•
Winding balance:
±1%
PART
NUMBER
"L"†
(mH)
1.0
3.0
10.0
DCI ‡
(Amps)
6.0
3.5
1.8
DCR†
(Ω)
max.
0.02
0.06
0.24
LEAKAGE
INDUCTANCE
(µH)
12
35
130
TEST
**
LEVEL
(VRMS)
0.08
0.20
0.50
LEAD
DIA.
0.036
0.032
0.032
A typical circuit for the elimination of noise is shown above. The filter contains
two stages, one for common mode noise (L1, C1 and C2) and one for
conducted noise (L2, L3 and C3). Special note should be made of the
phasing dots.
PART
NUMBER
"L"†
(mH)
2.0
4.0
8.0
16.0
DCI ‡
(Amps)
7.5
5.2
3.2
2.6
DCR†
(Ω)
max.
0.02
0.04
0.12
0.16
LEAKAGE
INDUCTANCE
(µH)
25
45
90
180
TEST
**
LEVEL
(VRMS)
0.08
0.20
0.50
1.00
LEAD
DIA.
0.047
0.036
0.032
0.032
*
31G1
*
31G3
*
31G10
† Inductance and DCR values shown are for each winding
Other inductances are available.
‡ DCI is for 40º C temperature rise.
**
Test level is at 1 kHz.
*
32K2
*
32K4
*
32K8
*
32K16
Dimensions are in inches
For LEAD DIA. see tables above
STYLE A
.300
3
1
1.000
4
2
1.130 MAX.
.20
MIN.
.560
MAX.
STYLE A
.300
3
1
1.270
4
2
1.350 MAX.
.20
MIN.
.750
MAX.
LEAD DIA.
LEAD DIA.
STYLE F
.630
MAX.
2
1
.13
MIN.
1.210
MAX.
STYLE F
2
1.200 MAX.
4
3
.830
MAX.
1
.13
MIN.
1.460
MAX.
.800
4
.400
3
.050 DIA.
.900
1.350 MAX.
.600
.050 DIA.
STYLE NA, NB
.300
3
1.000
4
2
LEAD DIA.
.250
MIN.
1
.600
MAX.
STYLE
NA
NB
WITH FOOT
STYLE NA, NB
.300
DESCRIPTION
WITHOUT FOOT
3
1.270
4
.250
MIN.
1
.800
MAX.
1.250
MAX.
These parts may be special
ordered with a
4-40UNC X 5 threads min. insert
1.450
MAX.
2
LEAD DIA.
.020
.020
PART NUMBER ORDERING INFORMATION
*
Add style prefix (from this page) to part number
EXAMPLE:
STYLE
CORE TYPE
30
A 31 G 1
INDUCTANCE
(milihenrys)
SIZE
COMMON MODE INDUCTORS
TOROTEL PRODUCTS INC
620 NORTH LINDENWOOD, OLATHE, KANSAS 66062
www.torotelproducts.com
(913)
747-6111
FAX (913) 747-6110
• Ideally suited as switching regulator and
coupled inductors, common mode chokes,
or in other power filtering applications.
• The temperature rise is less than 30 ºC
when measured at an ambient temperature
of 100 ºC, 0.1 v rms, 10 kHz, and at rated DC
current as shown in theTables below.
• A large selection of sizes provides
maximum performance for minimum size.
• Each unit is magnetically shielded.
CASE
A
MAX.
.280
(7.11)
.340
(8.63)
.415
(10.54)
B
MAX.
.410
(10.41)
.500
(12.7)
.630
(16.0)
C
±.010
.260
(6.6)
.350
(8.89)
.440
(11.17)
D
±.010
.160
(4.06)
.250
(6.35)
.340
(8.64)
INSERT
TERMINAL
ARRANGEMENT
A
A
A
B
.138-32
UNC-2B
B
LEAD
DIA.
.012
.012
.016
.016
.020
1
2
3
4
5
.500
.800
.560
.460
(12.70) (20.32) (14.22) (11.68)
.635
.950
(16.12) (24.13)
.670
(17.0)
.570
(14.48)
Dimensions are in inches (mm)
All inductors have split windings for versatility. They
can be connected in series, parallel or individually for
balanced filtering applications.
The ratings in the tables below are for a series-aided
connection of both windings. The inductance of a
parallel connection of these windings will result in
25% of the inductance at twice the rated current. The
DCR will be 25% of the series connection
.
SERIES CONNECTED
PART
INDUCTANCE CURRENT
DCR
NUMBER
Ω
(mH)
*
(DC
Amps
)
(Ω)
CASE
SERIES
1
2
3
4
PARALLEL
1
2
3
4
TERMINAL ARRANGEMENT A
B
DIA.
A
.020
±.010
(0.51)
1.00 ±.25
(25.4 ± 6.35)
SERIES CONNECTED
PART
NUMBER INDUCTANCE CURRENT
DCR
(mH)
*
(DC
Amps)
(Ω)
Ω
CASE
108º
PK-01
PK-02
PK-03
PK-04
PK-05
PK-06
PK-07
PK-08
PK-09
PK-10
PK-11
PK-12
PK-13
PK-14
PK-15
PK-16
PK-17
PK-18
PK-19
PK-20
PK-21
PK-22
PK-23
PK-24
PK-25
PK-26
PK-27
PK-28
PK-29
PK-30
20.0
20.0
20.0
20.0
20.0
15.0
15.0
15.0
15.0
15.0
10.0
10.0
10.0
10.0
10.0
7.5
7.5
7.5
7.5
7.5
5.0
5.0
5.0
5.0
5.0
3.0
3.0
3.0
3.0
3.0
0.06
0.10
0.14
0.22
0.29
0.07
0.12
0.16
0.25
0.33
0.08
0.14
0.20
0.31
0.40
0.10
0.17
0.24
0.38
0.49
0.12
0.21
0.30
0.47
0.60
0.16
0.27
0.38
0.60
0.78
54.00
29.00
20.00
12.40
10.20
40.50
22.00
15.00
9.30
7.70
27.00
14.60
10.00
6.20
5.10
20.30
11.00
7.50
4.70
3.80
13.50
7.30
5.00
3.10
2.60
8.10
4.40
3.00
1.90
1.50
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
PK-31
PK-32
PK-33
PK-34
PK-35
PK-36
PK-37
PK-38
PK-39
PK-40
PK-41
PK-42
PK-43
PK-44
PK-45
PK-46
PK-47
PK-48
PK-49
PK-50
PK-51
PK-52
PK-53
PK-54
PK-55
PK-56
PK-57
PK-58
PK-59
PK-60
PK-61
PK-62
PK-63
2.00
2.00
2.00
2.00
2.00
1.00
1.00
1.00
1.00
1.00
0.75
0.75
0.75
0.75
0.75
0.50
0.50
0.50
0.50
0.50
0.25
0.25
0.25
0.25
0.25
0.10
0.10
0.10
0.10
0.10
0.04
0.04
0.04
0.19
0.33
0.47
0.74
0.95
0.27
0.47
0.66
1.00
1.30
0.31
0.54
0.76
1.20
1.60
0.38
0.66
0.93
1.47
1.90
0.53
0.93
1.30
2.08
2.70
0.78
1.35
1.95
3.08
3.88
1.18
2.03
2.68
5.40
2.90
2.00
1.30
1.00
2.70
1.50
1.00
0.62
0.50
2.00
1.00
0.75
0.47
0.38
1.30
0.66
0.50
0.31
0.25
0.66
0.33
0.25
0.16
0.13
0.30
0.17
0.11
0.07
0.06
0.14
0.07
0.06
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
.020
±.010
(0.51)
72º
2
3
C
DIA.
4
72º
1
108º
D
DIA.
TERMINAL ARRANGEMENT B
B
DIA.
A
1.00 ±.25
(25.4 ± 6.35)
D
DIA.
90º
2
3
120º
C
DIA.
90º
INSERT
.200 DEEP
MIN.
4
1
60º
*Inductance is measured at 0.1 V
rms
and 10 kHz
31
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