PIEZO FILTERS
CERAMIC FILTERS FOR AM APPLICATIONS
SFU/SFZ/450/455kHz
The following filters were designed to address the needs
of standard AM filtering requirements. These filters are
recommended for use in low cost products where
economically, efficient designs are critical.
SPECIFICATIONS
Part Number
SFU455A
SFU/SFZ/450/455kHz
3dB
Bandwidth
(kHz)
10 (±3)
Ripple
(dB) max.
0
Selectivity
F
0
± 9kHz
4@–10kHz
6@+10kHz
4@+10kHz
6@–10kHz
23dB min.
Termination
Impedance
(Ohms) max.
3k
Spurious
Response
(dB) min.
10 (1~3MHz)
Insertion
Loss
(dB) max.
5
Operating
Temperature
Range
–10°C
to
+80°C
–10°C
to
+80°C
–20°C
to
+80°C
–20°C
to
+80°C
–10°C
to
+80°C
Withstanding
Voltage
Center
Frequency
(kHz)
455 ± 2
462 ± 2
455.5 ± 2
SFU455B
(connected
to an IFT)
SFZ455HL
10 (±3)
4.0 ± 1.0
—
1.5
3k
3k
10 (1~3MHz)
20 (F
0
~3MHz)
20 (F
0
~3MHz)
F
0
20 (1~3MHz)
5
7.0
50V
DC
SFZ455JL
456 ± 2
5.5 ± 1.0
1.5
18dB min.
30@–9kHz
24@+9kHz
3k
7.0
SFZ450C3N
450 ± 1
2.5 (±1)
—
3k
6.5
( ) Typ. value
DIMENSIONS: mm
SFU455
3.5 ± 0.3
7.0 ± 0.3
DIMENSIONS: mm
SFZ455
7.0 ± 0.3
9.0 ± 0.3
7.0 ± 0.3
DIMENSIONS: mm
SFZ450C3N
7.0 ± 0.3
7.0 ± 0.3
9.0 ± 0.3
9.0 ± 0.3
3.5
1.1 ± 0.1
0.8 ± 0.1
0.25
+1.0
–0.5
1.1 +0.1
–0
0.1
3.5 +1.0
–0.5
0.8 ± 0.1
1.75 ± 0.5
6–1.0 D.
1.1 +0.1
–0
0.1
3.5 +1.0
–0.5
0.8 ± 0.1
1.75 ± 0.5
6–1.0 D.
1.75 ± 0.5
0.1
2.5 ± 0.2
Sealing
3 –1.0 D.
0.35
2.5 ± 0.2
3.5 ± 0.5
Sealing
3.5 ± 0.2
3.5 ± 0.5
Sealing
2.5 ± 0.2
2.5 ± 0.2
3.5 ± 0.2
0.35
2.5 ± 0.2
CIRCUIT
CIRCUIT
CIRCUIT
56 pF
3k
S.S.G.
Rg=50
E2
3k
3k
RF
Voltmeter
S.S.G.
Rg=50
3k
RF
Voltmeter
Rg=50
S.S.G.
R
2
R
1
RF
Voltmeter
SFU455B is designed to be connected with an I.F.T.
Rg+R
1
=R
2
=Input/Output Impedance
Available as standard through authorized Murata Electronics Distributors.
448
CG01-I
