©2010-2014 by Murata Electronics N.A., Inc.
RO3118E (R) 4/18/14 Page 1 of 2
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Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Frequency, +25 °C Absolute Frequency
f
C
2, 3, 4, 5
317.925 318.075 MHz
Tolerance from 318.0 MHz
f
C
±75 kHz
Insertion Loss IL 2, 5, 6 1.6 2.2 dB
Quality Factor Unloaded Q
Q
U
9000
50Loaded Q
Q
L
1500
Temperature Stability Turnover Temperature
T
O
6, 7, 8
10 25 40 °C
Turnover Frequency
f
O
f
C
Frequency Temperature Coefficient FTC 0.032
ppm/°C
2
Frequency Aging Absolute Value during the First Year
|f
A
|
1, 6 10 ppm/yr
DC Insulation Resistance between Any Two Terminals 5 1.0 M
RF Equivalent RLC Model Motional Resistance
R
M
5, 7, 9
21
Motional Inductance
L
M
93 µH
Motional Capacitance
C
M
2.7 fF
Shunt Static Capacitance
C
O
5, 6, 9 2.8 pF
Test Fixture Shunt Inductance
L
TEST
2, 7 82 nH
Lid Symbolization 687 // YWWS
Standard Reel Quantity
Reel Size 7 Inch
10
500 Pieces / Reel
Reel Size 13 Inch 3000 Pieces / Reel
• Ideal for 318 MHz Remote Control and Security Transmitters
• Very Low Series Resistance
• Quartz Stability
• Complies with Directive 2002/95/EC (RoHS)
The RO3118E is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization of transmitters and local oscillators
operating at 318 MHz.
Absolute Maximum Ratings
Rating Value Units
Input Power Level 0 dBm
DC Voltage 12 VDC
Storage Temperature Range -40 to +125 °C
Operating Temperature Range -40 to +105 °C
Soldering Temperature (10 seconds / 5 cycles maximum) 260 °C
318.0 MHz
SAW
Resonator
RO3118E
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1. Frequency aging is the change in f
C
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 manufacture,
decreasing in subsequent years.
2. The center frequency, f
C
, is measured at the minimum insertion loss point,
IL
MIN
, with the resonator in the 50 test system (VSWR 1.2:1). The
shunt inductance, L
TEST
, is tuned for parallel resonance with C
O
at f
C
.
Typically, f
OSCILLATOR
or f
TRANSMITTER
is approximately equal to the
resonator f
C
.
3. One or more of the following United States patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment
manufacturer.
5. Unless noted otherwise, case temperature T
C
= +25 ± 2 °C.
6. The design, manufacturing process, and specifications of this device are
subject to change without notice.
7. Derived mathematically from one or more of the following directly
measured parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
8. 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
]. Typically oscillator T
O
is
approximately equal to the specified resonator T
O
.
9. This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance C
O
is the static (nonmotional) capacitance between the two terminals
measured at low frequency (10 MHz) with a capacitance meter. The
measurement includes parasitic capacitance with "NC” pads unconnected.
Case parasitic capacitance is approximately 0.05 pF. Transducer parallel
capacitance can by calculated as: C
P
C
O
-0.05pF.
10. Tape and Reel Standard Per ANSI / EIA 481.
SM3030-6 Case
3.0 X 3.0
Pb
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