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RO3144C
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Ideal for 916.5 MHz Remote Control and Data Telemetry Transmitters
Very Low Series Resistance
Quartz Stability
Pb
Complies with Directive 2002/95/EC (RoHS)
916.5 MHz
SAW
Resonator
The RO3144C 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 low power transmitters operating at
916.5 MHz. This SAW resonator is specifically designed for transmitters used in remote control and data
telemetry applications operating in the USA under FCC Part 15 and in Canada under DoC RSS-210.
Absolute Maximum Ratings
Rating
Value
Units
Input Power Level
0
dBm
DC Voltage
12
VDC
Storage Temperature
-40 to +85
°C
260
°C
Soldering Temperature (10 seconds / 5 cycles maximum)
SM5050-8 Case
5X5
Electrical Characteristics
Characteristic
Frequency, +25 °C
Sym
fC
Absolute Frequency
Insertion Loss
Quality Factor
Temperature Stability
Frequency Aging
2, 3, 4, 5
fC
Tolerance from 916.500 MHz
IL
Minimum
50 Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
MHz
±200
kHz
2.5
dB
40
°C
2800
10
Absolute Value during the First Year
|fA|
25
fC
6, 7, 8
FTC
ppm/°C2
ppm/yr
0.032
1, 6
5
Motional Resistance
RM
Motional Inductance
LM
Motional Capacitance
CM
Shunt Static Capacitance
CO
5, 6, 9
LTEST
2, 7
10
1.0
5, 7, 9
Lid Symbolization
Standard Reel Quantity
Units
916.700
26000
Frequency Temperature Coefficient
Test Fixture Shunt Inductance
Maximum
1.2
QU
Unloaded Q
Typical
916.300
2, 5, 6
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
Notes
M
12.7

55.9
µH
.54
fF
2.2
pF
13.5
nH
691 // YWWS
Reel Size 7 Inch
500 Pieces / Reel
Reel Size 13 Inch
3000 Pieces / Reel
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
2.
3.
4.
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 manufacture,
decreasing in subsequent years.
The center frequency, fC, is measured at the minimum insertion loss point,
ILMIN, with the resonator in the 50  test system (VSWR  1.2:1). The
shunt inductance, LTEST, is tuned for parallel resonance with CO at fC.
Typically, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment
manufacturer.
Unless noted otherwise, case temperature TC = +25 ± 2 °C.
©2010-2014 by Murata Electronics N.A., Inc.
RO3144C (R) 5/1/14
6.
7.
8.
9.
Page 1 of 2
The design, manufacturing process, and specifications of this device are
subject to change without notice.
Derived mathematically from one or more of the following directly
measured parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
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 -TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance CO
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: CP  CO - 0.05 pF.
www.murata.com
Electrical Connections
Pin
The SAW resonator is bidirectional and
may be installed with either orientation.
The two terminals are interchangeable
and unnumbered. The callout NC
indicates no internal connection. The NC
pads assist with mechanical positioning
and stability. External grounding of the NC
pads is recommended to help reduce
parasitic capacitance in the circuit.
Parameter Test Circuit
Connection
1
NC
2
Terminal
3
NC
4
NC
5
7
From 50 
Network Analyzer
NC
6
Terminal
7
NC
8
NC
1
8
6
To 50 
Network Analyzer
2
4
5
3
Power Test Circuit
NC
8
1
D 7
7
50  Source
at F C
1
2
6
6
2
3
5
5
3
G
Low-Loss
Matching
Network to
50 
1
NC
2
8
NC
7
3
NC
4
6
5
NC
NC
Example Application Circuits
4
4
P INCIDENT
P REFLECTED
F
Typical Low-Power Transmitter Application
200k 
Modulation
Input
+9VDC
C1
47
L1
(Antenna)
L
1
2
8
J
7
M
6
3
4
5
C2
P
ROXXXXC
Bottom View
H
RF Bypass
470
Typical Local Oscillator Application
I
Q
N
K
+VDC
C1
2
8
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
Min
4.80
4.80
1.30
1.98
1.07
0.50
2.39
mm
Nom
5.00
5.00
1.50
2.08
1.17
0.64
2.54
1.27
0.76
1.55
2.79
0.76
2.36
1.55
2.79
2.79
2.79
+VDC
L1
O
1
Dimension
Output
200k 
Max
5.20
5.20
1.70
2.18
1.27
0.70
2.69
Min
0.189
0.189
0.050
0.078
0.042
0.020
0.094
Inches
Nom
0.197
0.197
0.060
0.082
0.046
0.025
0.100
0.050
0.030
0.061
0.110
0.030
0.093
0.061
0.110
0.110
0.110
7
Max
0.205
0.205
0.067
0.086
0.050
0.028
0.106
6
3
4
5
C2
ROXXXXC
Bottom View
RF Bypass
Equivalent RLC Model
0.05 pF*
Cp
Rm
Lm
Co = Cp + 0.05 pF
*Case Parasitics
Cm
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
fC = f O , T C = T O
0
0
-50
-50
-100
-100
-150
-150
(f-fo ) / fo (ppm)
A
E
C
B
8
-200
-80 -60 -40 -20
-200
0 +20 +40 +60 +80
T = TC - T O ( °C )
©2010-2014 by Murata Electronics N.A., Inc.
RO3144C (R) 5/1/14
Page 2 of 2
www.murata.com
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