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Designed for 318.0 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS)
Tape and Reel Standard per ANSI/EIA-481
RO3118A-1
RoHS
Compliant
318.0 MHz
SAW
Resonator
The RO3118A-1 is a one-port surface-acoustic-wave (SAW) resonator packaged in a surface-mount ceramic
case. It provides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters
operating at 318.0 MHz.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
±30
VDC
-40 to +85
°C
260
°C
Case Temperature
Soldering Temperature (10 seconds / 5 cycles maximum)
Electrical Characteristics
Characteristic
Sym
Center Frequency, +25 °C
fC
Absolute Frequency
Insertion Loss
Temperature Stability
Frequency Aging
Typical
317.950
IL
1.5
Unloaded Q
QU
12000
50 Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
fC
Frequency Temperature Coefficient
FTC
0.032
Absolute Value during the First Year
|fA|
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
Minimum
fC
Tolerance from 318.0 MHz
Quality Factor
Notes
SM5035-4
Maximum
Units
318.050
MHz
±50
kHz
2.0
dB
40
°C
2000
10
25
10
1.0
ppm/°C2
ppm/yr
M
Motional Resistance
RM
19.8
Motional Inductance
LM
118
µH
Motional Capacitance
CM
2.1
fF
Shunt Static Capacitance
CO
2.9
pF
79
nH
Test Fixture Shunt Inductance
LTEST
Lid Symbolization (YY= Year, WW = Week, S = Shift)
763, YYWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1. The design, manufacturing process, and specifications of this device are subject to change.
2. US or International patents may apply.
3. RoHS compliant from the first date of manufacture.
©2010-2014 by RFM Integrated Device, Inc.
RO3118A-1 (R) 09/21/2021
Page 1 of 3
www.rfmi.co
Electrical Connections
Equivalent RLC Model
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.
C
Terminal
Case Ground
Case Ground
P
L
Terminal
C
C
C
S
C
M
C
R
M
= 0 .0 5 p F (C a s P a r a s t c s )
= S A W S ta t c C a p a c ta n c
= C S + C P
P
S
M
Temperature Characteristics
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
ELECTRICAL TEST
fC = f O , T C = T O
-50
-50
-100
-100
-150
-150
-200
-80 -60 -40 -20
Case
-200
0 +20 +40 +60 +80
T = TC - T O ( °C )
To 50
Network Analyzer
From 50
Network Analyzer
0
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
T o p V ie w
S id e V ie w
B
C
B o tto m
V ie w
E
)
)
1
A
POWER TEST
P
INCIDENT
50 Source
P
at F C
REFLECTED
CW RF Power Dissipation =
Low-Loss
Matching
Network to
50
2
Terminal
G
1
)
NC
NC
D
Terminal
P INCIDENT - P REFLECTED
I
Typical Application Circuits
I
Typical Low-Power Transmitter Application
H
H
+9VDC
Modulation
Input
J
H
200k
C1
47
K
L1
(Antenna)
L
C2
RF Bypass
RO3XXXA
Bottom View
470
Dimensions
A
Typical Local Oscillator Applications
Output
+VDC
C1
+VDC
L1
Millimeters
Inches
Min
Nom
Max
Min
Nom
Max
4.87
5.00
5.13
0.191
0.196
0.201
B
3.37
3.50
3.63
0.132
0.137
0.142
C
1.45
1.53
1.60
0.057
0.060
0.062
D
1.35
1.43
1.50
0.040
0.057
0.059
E
0.67
0.80
0.93
0.026
0.031
0.036
F
0.37
0.50
0.63
0.014
0.019
0.024
G
1.07
1.20
1.33
0.042
0.047
0.052
C2
RO3XXXA
Bottom View
©2010-2014 by RFM Integrated Device, Inc.
RO3118A-1 (R) 09/21/2021
RF Bypass
Page 2 of 3
www.rfmi.co
Recommended Reflow Profile
1. Preheating shall be fixed at 150~180ºC for 60~90 seconds.
2. Ascending time to preheating temperature 150ºC shall be 30 seconds min.
3. Heating shall be fixed at 220ºC for 50~80 seconds and at 260ºC +0/-5ºC peak (10 seconds).
4. Time: 5 times maximum.
©2010-2014 by RFM Integrated Device, Inc.
RO3118A-1 (R) 09/21/2021
Page 3 of 3
www.rfmi.co
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