RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 1 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RF1391C-040103
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency at 25C
Absolute Frequency
f
c
1, 2
433.42
MHz
Tolerance from 433.42 MHz
f
C
-120/+200
kHz
Insertion Loss
IL
1
3.0
5.0
dB
3 dB Bandwidth
BW
3
1, 2
500
600
750
kHz
Rejection
at f
c
- 21.4 MHz (Image)
1
40
50
dB
at f
c
- 10.7 MHz (LO)
30
40
Ultimate
80
Temperature
Operating Case Temp.
T
C
3, 4
-40
+85
C
Turnover Temperature
T
O
15
25
35
C
Turnover Frequency
f
O
f
c
MHz
Freq. Temp. Coefficient
FTC
0.032
ppm/C
2
Frequency Aging
Absolute Value during the First Year
|fA|
5
10
ppm/yr
Impedance @ fc
Input Z
IN
= R
IN
//C
IN
Z
IN
1
212
// 3.1 pF
Output Z
OUT
= R
OUT
//C
OUT
Z
OUT
212
// 3.1 pF
Lid Symbolization (Y=year WW=week S=Shift)
415 YWWS
Standard Reel Quantity 7 Inch Reel
500 pieces/reel
Standard Reel Quantity 13 Inch Reel
3000 pieces/reel
Ideal Front-End Filter for Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Complies with Directive 2002/95/EC (RoHS)
The RF1391C is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 433.42 MHz receivers. Receiver designs using this filter include superhet with
10.7 MHz or 500 kHz IF, direct conversion and superregen. Typical applications of these receivers are wire-
less remote-control and security devices operating in Europe under ETSI I-ETS 300 220.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. RFM's ad-
vanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with
simple external impedance matching.
433.42 MHz
SAW Filter
RF1391C
SM5050-8 Case
5 x 5
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50
test system with
VSWR
1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f
c
. Note that insertion loss and band-
width and passband shape are dependent on the impedance matching component values and quality.
2. The frequency f
c
is defined as the midpoint between the 3dB frequencies.
3. Where noted specifications apply over the entire specified operating temperature range.
4. The turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case temperature, T
c
, may
be calculated from: f = f
o
[1 - FTC (T
o
- T
c
)
2
].
5. Frequency aging is the change in fc with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures
above +65C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years.
6. The design, manufacturing process, and specifications of this device are subject to change without notice.
7. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.
8. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
Pb
433.42 MHz SAW Filter
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
E-mail: info@rfm.com
Page 2 of 2
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
http://www.rfm.com
1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
RF1391C-040103
Absolute Maximum Ratings
Rating
Value
Units
Input Power Level
10
dBm
DC Voltage
12
VDC
Storage Temperature
-40 to +85
C
Soldering Temperature
(10 seconds / 5 cycles max.)
260
C
Pin
Connection
1
Input Ground
2
Input
3
to be Grounded
4
Case Ground
5
Output
6
Output Ground
7
to be Grounded
8
Case Ground
Matching Circuit to 50
Electrical Connections
A
1
2
3
B
7
6
5
4
C
D 7
6
5
4
E
F
G
1
2
3
8
8
Dimension
mm
Inches
Min
Nom
Max
Min
Nom
Max
A
4.8
5.0
5.2
0.189
0.197
0.205
B
4.8
5.0
5.2
0.189
0.197
0.205
C
1.7
0.067
D
2.08
0.082
E
1.17
0.046
F
0.64
0.025
G
2.39
2.54
2.69
0.094
0.100
0.106
Case Dimensions
Typical Filter Response
Typical filter responses are shown below. The actual response is dependent on external impedance matching and circuit layout.
PRm
Cor
CH1 S21 LOG 8 dB / REF -30 dB 1:-3.9433 dB 433.500 000 MHz
START 409.5 MHz 5 Mhz/div STOP 459.5 MHz
1
Max
Image
Lo
8 dB/div
PRm
Cor
1
CH1 S21 LOG 5 dB / REF -20 dB 1:-3.9167 dB 433.420 000 MHz
START 432.500 000 MHz STOP 434.500 000 MHz
5 dB/div
200 kHz/div
Min 3dB
Passband
at 25C
1
2
3
8
Input
Output
C=4.3 pF
L=33 nH
7
6
5
4
C=4.3 pF
L=33 nH
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