BLM18RK471SN1D Murata Electronics, BLM18RK471SN1D Datasheet - Page 137

• Manufacturer Part Number: BLM18RK471SN1D
• Description: EMI Filter 0.2A Flat Style SMD
• Manufacturer: Murata Electronics
• Type: EMI Suppression Filterr

Specifications of BLM18RK471SN1D

• Case Size: 0603
• Maximum Current Rating: 0.2 A
• Termination: Flat Style

Suppression
Example of EMI Suppression
in an Actual Circuit
!Note
(Cut-off frequency 50MHz)
with Conventional LCs
before Filter Mounting
and Noise Spectrum
Solid Type EMI Filter
L: Chip Inductor
C: Chip Capacitor
Conventional Chip
Signal Waveform
Effect
Filter Combined
NFW31S Series
(NFM41CC 470pF)
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.
EMI
L
Type of Filter
C
(270pF)
L
NFW31 Series
Signal Waveform 20ns/div
Signal Wave Form
(
1V/div
)
(
20ns/div
100
1V/div
100
100
100
80
60
40
20
80
60
40
20
80
60
40
20
80
60
40
20
0
0
0
0
)
(10:1 Active Probe)
/ EMI Suppression Effect / Description
100
100
Noise Spectrum
100
100
Measuring Circuit
Frequency ( MHz )
Level before
Frequency (MHz)
Level before
Frequency (MHz)
Level before
Frequency (MHz)
filter mounting
filter mounting
filter mounting
10MHz
200
200
74ALS04
200
200
300
300
300
300
400
400
400
400
500
500
500
500
EMI
Suppression Filter
NFW31S's steep attenuation
characteristic means excellent EMI
suppression without waveform
cornering.
3-terminal capacitors suppress
signal frequencies as EMI
frequencies so the signal waveform
is distorted.
Combinations of inductors and
capacitors can yield a steep
attenuation characteristic, but they
require a great deal more mounting
space.
Moreover, at high frequencies the
EMI suppression is less than that
obtained by NFW31S.
Measuring
Point
74ALS00
135
Mar.28,2011
C31E.pdf