This component is compliant
with RoHS directive.
This component was always
RoHS compliant from the first
date of manufacture.
• Ideal for 318 MHz Automotive-Keyless-Entry Transmitters
• Very Low Series Resistance
• Quartz Stability
The RO3118E-1 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 local oscillators operating at
approximately 318 MHz.
Absolute Maximum Ratings
Input Power Level
Storage Temperature Range
Operating Temperature Range
Soldering Temperature (10 seconds / 5 cycles max.)
-40 to +125
-40 to +105
3.0 X 3.0
Frequency (+25 °C)
Tolerance from 315.0 MHz
50W Loaded Q
Frequency Temperature Coefficient
Absolute Value during the First Year
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model Motional Resistance
Shunt Static Capacitance
Test Fixture Shunt Inductance
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
2, 3, 4, 5
2, 5, 6
6, 7, 8
5, 7, 9
5, 6, 9
10 25 40
765 // YWWS
500 Pieces / Reel
3000 Pieces / Reel
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
1. Frequency aging is the change in fC with time and is specified at +65°C or less. 7. Derived mathematically from one or more of the following directly measured
Aging may exceed the specification for prolonged temperatures above +65°C.
parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
Typically, aging is greatest the first year after manufacture, decreasing in
8. Turnover temperature, TO, is the temperature of maximum (or turnover)
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
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°C±2°C.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
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.
9. 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.
10. Tape and Reel Standard Per ANSI / EIA 481.
Copyright © Murata Manufacturing Co., Ltd. All rights reserved. 2007
RO3118E-1 (R) 4/26/19
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