Common Mode Chokes
for Telecom Applications
Designed for 4-Wire Links ISDN S / T1
For EMI Reduction - Filters Common Mode Noise
500 V
RMS
Minimum Isolation Between Windings
Frequencies 100 kHz to 200MHz
Schematic
Low Frequency Chokes
Electrical Specifications at 25
O
C
LF Choke
OCL
L
L
sec
Part
min.
max.
Number
( mH )
(
µH
)
C
W/W
max.
( pF )
DCR
max.
(
Ω
)
Z
OC
min.
( kΩ )
150 kHz
Z
OC
min.
( kΩ )
300 kHz
Z
OC
min.
( kΩ )
500 kHz
Z
OC
min.
( kΩ )
1MHZ
F-1400
F-1401
F-1402
F-1403
6.0
4.0
4.0
1.0
35.0
30.0
0.7
10.0
22
10
40
10
1.4
0.7
0.7
0.7
5.5
3.3
3.3
0.9
8.0
6.0
6.0
1.6
8.0
8.0
8.0
2.3
9.0
11.0
11.0
3.3
High Frequency Chokes
Electrical Specifications at 25
O
C
HF Choke
Part
Number
OCL
min.
(
µH
)
L
L
sec
max.
(
µH
)
C
W/W
max.
( pF )
DCR
max.
(
Ω
)
Z
OC
min.
( kΩ )
10 MHz
Z
OC
min.
( kΩ )
30 MHz
Z
OC
min.
( kΩ )
70MHz
Z
OC
min.
( kΩ )
100MHZ
F-1600
F-1601
F-1602
24.0
16.0
8.0
0.20
0.20
0.20
15
12
10
0.30
0.30
0.25
0.9
0.7
0.55
1.60
1.35
1.10
1.15
1.05
1.00
0.80
0.65
0.52
*OCL,
LAN Chokes
LEAK-
Electrical Specifications at 25 C
AGE
Turns
OCL
Part
Ratio
min.
INDU
Number
(
µH
)
O
F-135X Schematic
L
L
sec
max.
(
µH
)
C
W/W
max.
( pF )
DCR
max.
(
Ω
)
HI-POT
min.
( V
RMS
)
Package
Style
F-1351
F-1352
1:1:1:1
1:1:1:1
18
36
.3
.3
65
200
25
25
500
500
8 Pin
8 Pin
Impedance Curve for F-1351 / 1352
4000
Typical
3000
Z
2000
(
Ω
)
1000
0
10
20
40
60 80 100
Frequency ( MHz )
200
300
300
Minimum
Specifications subject to change without notice.
For other values & Custom Designs, contact factory.
CHOKES -7/97
Rhombus
Industries Inc.
31
15801 Chemical Lane, Huntington Beach, CA 92649-1595
Tel: (714) 898-0960
•
Fax: (714) 896-0971
RHOMBUS-IND [ Rhombus Industries Inc. ]
