BLM21AG601SN1

Manufacturer Part NumberBLM21AG601SN1
ManufacturerMurata
BLM21AG601SN1 datasheet
 
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Page 86/163:

EMI Suppression Effect

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!Note
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
!Note
This catalog has only typical specifications. Therefore, you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.

EMI Suppression Effect

!Example of EMI Suppression
in an Actual Circuit
Type of Filter
Signal Wave Form
Signal Waveform
and Noise Spectrum
before Filter Mounting
Signal Waveform 20ns/div
NFW31S Series
(Cut-off frequency 50MHz)
Conventional Chip
Solid type EMI Filter
(NFM41CC 470pF)
Filter Combined
with Conventional LCs
L
L
C
L : Chip Inductor
C : Chip Capacitor
(270pF)
Noise Suppression Effect of NFW31S Series
[Measuring Circuit]
74ALS04
10MHz
(
)
20ns/div

EMI Suppression Effect

1v/div
100
80
60
40
20
0
100
200
300
400
Frequency [ MHz ]
(
)
Noise Spectrum
1V/div
(10:1 Active Probe)
100
Level before
filter mounting
80
60
40
20
0
100
200
300
400
Frequency [MHz]
100
Level before
filter mounting
80
60
40
20
0
100
200
300
400
Frequency [MHz]
100
Level before
filter mounting
80
60
40
20
0
100
200
300
400
Frequency [MHz]
C31E9.pdf 03.3.12
EMI
74ALS00
Suppression Filter
Measuring
Point
Description
500
The NFW31S's steep attenuation
characteristic means excellent EMI
suppression without waveform
cornering.
500
3-terminal capacitors suppress
signal frequencies as EMI
frequencies so the signal waveform
is distorted.
500
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 the NFW31S.
500
85
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