Document 152
Tip and Ring Common Mode Filters
These economical filters are designed to help telecom-
munications equipment engineers meet FCC and CCITT
requirements. Available in 1 or 2 line (2 or 4 wire) versions,
Coilcraft tip and ring filters provide >15 dB attenuation of
common mode noise over the 3 Hz to 300 MHz frequency
range.
Part number:
Minimum inductance:
Rated current:
DC resistance:
Dielectric strength
1
:
TRF 2000L (1-line)
TRF 4000L (2-line)
20 µH
500 mA
0.065 Ohms max
1500 Vrms min
1. For TRF 2000, dielectric strength measured from pins 1,8 to 4,5. For
TRF 4000, dielectric strength measured from pins 1,2,7,8 to pins
3,4,5,6.
2. Operating temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
TRF 2000L
Typical Response*
0
Differential Mode
TRF 4000L
C
C
B
B
Attenuation (dB)
10
20
Common mode
D
D
0.030
dia
0,76
8
5
0.030
dia
0,76
8
7
6
5
30
A
40
0.1
1
10
100
1000
1
2
4
A
Frequency (MHz)
1
2
3
4
*
measured on HP 8753D network analyzer
Terminations:
8
Recommended
Board Layout
5
Tin-silver over tin
Recommended
Board Layout
8
5
TRF 2000
8
5
TRF 4000
8
7
6
5
0.040
1,02
(5×)
1
4
E
0.040
1,02
(8×)
E
1
4
F
G
F
1
4
1
2
3
4
A max
0.425
10,80
B max
0.550
13,97
C max
0.475
12,07
D
0.115
2,92
E
0.300
7,62
F
0.100
2,54
G
0.300
7,62
Specifications subject to change without notice.
Please check our website for latest information.
Document 152
Revised 05/27/05
© Coilcraft, Inc. 2010
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