Automotive Onboard Quartz Crystal


Contributing to Advanced Safe Cruising Technology in Automobiles with Quality Quartz Crystals

Advanced Driver Assistance Systems, or ADAS  , a prominent and promising automotive technology, cannot exist without electronic components. Murata’s quality precision compact quartz crystals provide optimum solutions for fast precision compact ECU. 

We cannot manipulate a car today without electronic control units  (ECUs) ; we cannot run, turn, or stop it without the ECUs. In recent years, a number of sensors, such as cameras and millimeter wave radar, have started to be installed onboard, providing an additional safety function called ADAS. Components essential to the ECU of these sensors are ICs and timing devices; the latter control the behavior of the ICs. Murata has developed precision quartz crystals using its unique manufacturing technologies.

The quartz crystal HCR XRCGB-F-A series, despite its small size of 2.0 × 1.6 mm, exhibits excellent quality, volume-productivity, and cost efficiency, with the world’s first original packaging technology that has never been introduced to existing quartz crystals. It covers a frequency range from 24 MHz to 48 MHz. The design of the crystal blank was optimized to minimize frequency tolerance to ±35 ppm at the standard operating temperature of automobiles (-40°C to +125°C), allowing it to accommodate next-generation onboard LAN, such as Ethernet, and graphic processing ECU. The products comply with the requirements of the RoHS/ELV Directives and the AEC-Q200 standards, the latter of which are the reliability test standards for automotive onboard electronic components.

Quartz crystal HCR XRCGB-F-A series 2.0 × 1.6 mm size

Quartz crystal HCR XRCGB-F-A series
2.0 × 1.6 mm size

The XRCGB-F-A series adopts the Cap Chip structure, a unique non-hermetic seal package, which has already been used in Murata’s ceramic resonator CERALOCK. The product series adopts a simple structure with a resin-sealed metal cap on a monolayer ceramic substrate, but Murata’s manufacturing technologies and quality control accumulated in the development of CERALOCK has culminated in this economical yet quality product series. Common quartz crystals are hermetically sealed with a specifically designed ceramic package, but the presence of even a trace of water could cause unstable characteristics or improper oscillation. The XRCGB-F-A series allows water vapor to permeate the resin seal at a molecular level, which effectively eliminates the possible variation of characteristics that may be caused by the presence of remaining water vapor inside the package. Further, the product can eliminate minute inorganic contaminants (particles), and therefore it can provide components of extremely high quality. Murata will continue to be committed to providing timing devices that will be able to contribute greatly toward automotive downsizing and the enhancement of their performance and quality. 

Item Unit Standard
Nominal frequencies MHz 24 25 27 48
Operating temperature range -40 to +125
Frequency tolerance ppm ±30 ±50
Frequency stability ppm ±35 ±65
Equivalent series resistance ohm 120 100 80 60
Drive level uW 300max.
Load capacitance pF 6

Electrical characteristics at typical frequencies

Glossary

ADAS (Advanced Driving Assistance Sytems) : Systems that use sensing technologies with cameras and millimeter wave radar for monitoring the situation around an automobile and technologies for controlling automotive engine, brake, and steering systems, to improve the safety of driving.
ECU (Electric Control Unit) : A generic term for electronic control circuit systems.
Ethernet : Standards for local area networks (LANs) commonly used in offices and homes. They are in the process of being introduced in automobiles as the next-generation standards for automotive LANs. Among these are 100BASE-TX and BroadR-Reach® set by the IEEE 802.3 and the OPEN Alliance SIG, respectively.
AEC-Q200 : Reliability test standards for automotive electronic components set by the Automotive Electronics Council.
RoHS/ELV Directives : Directives that restrict or prohibit the use of environmentally hazardous substances (lead, mercury, cadmium, hexavalent chromium, two organobromine compounds) in EVs.

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