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©2008 by RF Monolithics, Inc. RF1391C - 3/21/08
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximu
mUnits
Center Frequency at 25°C Absolute Frequency fc1, 2 433.42 MHz
Tolerance from 433.42 MHz ∆fC-120/+200 kHz
Insertion Loss IL 1 3.0 5.0 dB
3 dB Bandwidth BW31, 2 500 600 750 kHz
Rejection at fc - 21.4 MHz (Image)
140 50 dBat fc - 10.7 MHz (LO) 30 40
Ultimate 80
Temperature Operating Case Temp. TC
3, 4
-40 +85 °C
Turnover Temp erature TO15 25 35 °C
Turnover Frequency fOfcMHz
Freq. Temp. Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 5 ≤10 ppm/yr
Impedance @ fc Input ZIN = RIN//CIN Z
IN 1212 Ω // 3.1 pF
Output ZOUT = ROUT//COUT ZOUT 212 Ω // 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 provide 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 wireless 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 th an 40 dB, of the LO and i mage spuri ous respon ses of su perhet recei vers with 10.7 MHz
IF. RFM’s advanced SAW design and fabrication technology is utilized to achieve high
performance and very low loss with simple external impedance matching.
433.4 2 MHz
SAW Filter
RF1391C
SM5050-8 Case
5 x 5
CAUTION: Electrostati c Sensitive Devi ce. Observe p recautions 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 Ω test system with
VSWR ≤ 1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, fc. Note that insertion loss and band-
width and passband shape are dependent on the impedance matching component values and quality.
2. The frequency fc 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, TO, is the temperature of maximum (or turnover) frequency, fo. The nominal frequency at any case temperature, Tc, may
be calculated from: f = fo[1 - FTC (To-T
c
)
2
].
5. Frequency aging is the change in fc with time and is specified at +65°C or less. Aging may exceed the specification for prolonged temperatures
above +65°C. Typically, aging is greatest the first year after m anufacture, decre asing 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 produc t must be approved by the appropriate government agency prior to manufacture or sale.
Pb
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©2008 by RF Monolithics, Inc. RF1391C - 3/21/08
Absolute Maximum Ratings
Rating Value Units
Input Power Level 10 dBm
DC V oltage 12 VDC
S torage 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 50Ω
Electrical Connections
A
1
2
3
B
7
6
5
4
C
D7
6
5
4
E
F
G
1
2
3
88
Dimension mm Inches
Min Nom Max Min Nom Max
A4.8 5.0 5.2 0.189 0.197 0.205
B4.8 5.0 5.2 0.189 0.197 0.205
C1.7 0.067
D2.08 0.082
E1.17 0.046
F0.64 0.025
G2.39 2.54 2.69 0.094 0.100 0.106
Case Dimensions
Pin Connection
1 Input
2 Input Ground
3 Ground
4 Case Gro und
5 Output Gro und
6Output
7 Ground
8 Case Gro und
Optional
1
2
3
8
7
6
54
Input
33 nH
4.3 pF
Output
4.3 pF
33 nH
1
2
3
8Input
Output
C=4.3 pF
L=33 nH
7
6
54C=4.3 pF
L=33 nH
