COILCRAFT DLFC9

Document 153
RS-232 EMI Filter Modules
Coilcraft’s EMI filter modules are an easy, effective way
to eliminate the problems of stray electromagnetic interference (EMI) in signal cables running between poorly
filtered equipment.
Available in DB-25, -15 and -9 versions, the modules
plug between an RS-232 cable and an input or output
port. Common mode magnetics filter all lines including
the frame ground, attenuating EMI over the critical
30 - 300 MHz range while leaving data signals totally
undisturbed.
Comparable EMI filters for circuit board mounting are also
available.
Male DB
A
B
C
Pins
DLFC9
1.35
34,29
2.25
57,15
0.67
17,02
9
DLFC15
1.65
41,91
2.25
57,15
0.67
17,02
15
DLFC25
2.16
54,86
2.25
57,15
0.67
17,02
25
Female DB
A
B
C
Typical Attenuation1
Attenuation (dB)
-10
Differential Mode
0
Co
mm
10
on
Mo
de
20
30
0.1
1
10
100
1000
Frequency (MHz)
1. Measured on HP 8753D network analyzer. Ref: 50 Ohms.
2. Operating temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
Specifications subject to change without notice.
© Coilcraft, Inc. 2009
Document 153
Revised 11/26/02