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Noise Filter
SEMIFILT
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SUMITOMO
Noise Filter
SEMIFILT
CONTENTS
Surface mount, small outline Noise Filter
SEMIFILT LGM Series - T Type / Type
SEMIFILT SC Series - Distributed Constant Type Noise Filter
SEMIFILT SGM Series - Small in size with a high D.C. current rating
SEMIFILT RGM Series - CR Filter for Noise Reduction
Characteristic Comparison Data
Application Notes
High Frequency Ceramic Capacitor 1005 Series
High Frequency Ceramic Capacitor 1608,1610,1612,1410 Series
High Frequency Ceramic Capacitor Application Note
Soldering Conditions/Surface Mounting Example
Embossed Taping & Packing Specifications
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1
SEMIFILT LGM Series -T Type / Type
20125
LC
High performance noise filter composed
of two different materials optimized for L
and C.
P
The LGM20 Series has compact physi-
cal dimensions 2.0 1.25mm.
The LGM20 Series has large attenua-
tion in wide frequency band.
The LGM20 Series remove the noise
with keeping the original signal wave
form because of its sharp cutoff.
Noise reduction in variety of circuits.
example
P
Type
Circuit type P: type T:T type
Cutoff frequency (MHz)
Model Name
Cut-off Frequency Typ.
MHz
LGM20P030
30
LGM20P050
50
LGM20T100
100
mm
2.0 0.2
1.25 0.2
0.8 0.2
0.4 0.3
0.3 0.2
Rated Current Rated Voltage Insulator Resistance Temperature Range
DC mA
DC V
M
;200 12
Top View
L
10min.
Side View
25~+85
;0.6
Resist
0.4 0.3
1.4 Through Hole
2.8 (unit:mm)
Connect to
ground
pattern of
mounting
side
Ground
pattern
0 IN OUT
-5
-10 LGM20P050
-15
GND
-20 T Type
-25
-30 LGM20P030
-35
IN OUT
-40
-45 LGM20T100
-50
1 10 100 1000 10000
Frequency MHz
GND
Type
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2
SEMIFILT SC Series-Distributed Constant Type Filter
DCT Type Noise Filter
C
C
LC
SEMIFILT
FILT
L
L
SEMIFILT
SEMI-
SC
The composition of conventional noise
filters consists of a combination of induc-
tance (L) and capacitance (C).
Typically, the equivalent circuit for these
filters is one of the "Lumped Constant
Circuit" type where a by-pass capacitor
is used in conjunction with an inductor.
See Figure 2.
The new "DCT" noise filters (SEMIFILT)
are unique in that they employ a
"Distributed Constant Circuit" type where
the capacitance and inductance are
combined to form an integrated capaci-
Noise
tive/inductive circuit as shown in Figure 1.
When conventional noise filters (Lumped
Constant type) are not achieving suffi-
cient noise reduction,our SC series can
directly replace these filters without any
adverse effects on circuit characteristics.
SEMIFILT SC series are available in sev-
eral series,each covering various fre-
quency ranges.
SEMIFILT SC series have also shown
excellent protection against EMI noise
from various external electronic appli-
ances.
Noise
- fig.
- fig.
Conceptual Structure of SC/SP Series
SC DCT noise filters (SEMIFILT SC
LC
Series)are constructed by winding two
conductors with an interlayer of dielectric
material. High attenuation characteristics
are achieved by continuous integration of
the L and C.
LFC R
Dielectric
Conductor
Conductor
Dielectric
Via Hole
Conductor
LFC R
Directional Noise Reduction Effect
(Bypass effect)
High frequency noise injected through
terminal generates an electromotive
force.
Due to the proximity of the ground con-
nection, line responds as a bypass
capacitor and shunts the unwanted noise
to ground.
(Inductor effect)
In the alternate case, when a high fre-
quency noise is injected into terminal ,
the bypass effect is decreased. This is
due to the fact that line at its terminat-
ed end is responding more as an induc-
tor, with less bypass capacitance. The
high frequency noise is attenuated by the
inductive effect of the main line itself.
Noise
No. Terminal
No. Terminal
GND
No. Terminal
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SEMIFILT SC Series Overview
SC
LFC
SMD
Sumitomo offers distributed constant
type, surface mount and small outline
noise filters with exceptional EMI attenu-
ation characteristics. The facter that
enabled this breakthrough is Sumitomo's
patented LFC (Low temperature
Fireable Ceramics) technology.
800
2012 t0.8
2012 t1.6
3216 t2.5
No reflection of wave form regardless
of signal speed.
High attenuation covering wide fre-
quency bandwidth.
Acts as impedance matching parts in
the signal line.
Clock output signal line.
In/out video signal line for super high
resolution mode.
High speed signal line.
example
800
Series Name
Capacitance pF
SC-K,U
Cut-off Frequency MHz SC-J,F
Size 2012 t0.8
2012 t1.6
3216 t2.5
SC-J
Noise
Source
SC-F,U,K
SC-J
SC-J Series
Rated Voltage Rated Current Insulator Resistance
All Models
DC V
DC mA
M
25 200 10 3min.
SC-F
SC-F Series
Temperature Range
40~+85
Rated Voltage Rated Current Insulator Resistance
All Models
DC V
DC mA
M
25 200 10 3min.
SC-U
SC-U Series
Temperature Range
40~+85
All Models
Rated Voltage
DC V
25
Rated Current Insulator Resistance D.C. Resistance Temperature Range
DC mA
M
m
200
10 4min.
300max
40 ~+85
SC-K
SC-K Series
All Models
Rated Voltage
DC V
25
Rated Current Insulator Resistance D.C. Resistance Temperature Range
DC mA
M
m
200
10 4min.
300max
40 ~+85
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