DLFC

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
Female DB
A
A
B
C Pins
1.35 2.25 0.67
9
34,2957,15 17,02
1.65 2.25 0.67
15
41,9157,15 17,02
2.16 2.25 0.67
25
54,8657,15 17,02
C
Typical Attenuation1
-10
Attenuation (dB)
B
DLFC9
DLFC15
DLFC25
Differential Mode
0
Co
mm
10
on
Mo
d
e
20
30
0.1
1
10
100
1000
Frequency (MHz)
1. Measured on HP 8753D network analyzer. Ref: 50 Ohms.
2. Ambient temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 153 Revised 11/26/02
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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