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Use this drop-down menu to jump to all the product news stories from the Spring 2006 issue of Murata Mail. Coils0.4mm by 0.2mm
Our engineers have taken the already tiny EIA 0201 chip coil and reduced its footprint by another 40%! Thickness is down by 30% giving Murata's subminiature (LQP02) series EIA 0402 dimensions of just 0.4x0.2x0.2mm. The trend towards smaller and more multi-functional mobile communications equipment, including cellular 'phones, accelerates. While doing so, products still require high Q components in order to avoid signal attenuation. This in turn, demands progressively smaller Hi Q chip coils. Hence this new development from our R&D people. It took a revamping of our own latest micro-fabrication technologies, plus optimising coil formation and internal structure to produce this, the smallest product of its type in the world. Like most Murata products, these chip coils are RoHS compliant. In spite of the tiny proportions, our processing technology achieves large Q values at high frequencies with stable inductance. The available inductance range is from 0.4 to 10nH in sixteen steps, with tolerance of 0.3nH 5%. Rated currents range from 70 to 160mA and maximumDC resistance from 3.6 to 0.6ohm. We expect to add other values and tighter tolerances in the future.
EMI FiltersSmaller and better EMI filters
Development of Murata materials and processes produces smaller chip ferrite bead inductors (BLM15BA) with higher performance. Our new filters function almost like resistors at noise frequencies, greatly reducing the possibility of resonance while leaving signal wave-forms undistorted. The low DC resistance causes minimal signal attenuation and dimensions are just 1.05x0.5x0.5mm; a 50% reduction in footprint. The effectiveness of the filters depends entirely on the relationship between the construction, material and the operating frequency. Additionally, they need no ground, particularly useful in those awkward situations where providing a ground would be difficult or expensive. Terminations are Pb-free and Ni-Sn plating of the external electrodes provides excellent solder heat resistance. We recommend machine handling and reflow soldering. Packaging is in reels of 10,000 or 50,000; the latter offering enhanced machine efficiency and reduced labour content.
PTC-NTC TechnologyEasy temperature sensing & protection
Prevent thermal runaway and avoid damage to circuitry and ICs without ADC, comparator or software using Murata PTC thermistors (POSISTOR®). Our latest offering (PRF15 POSISTOR®) is just 1.0mm long, 0.5mm high and provides permanent self re-setting protection. It is also the first PTC thermistor in the world in the EIA 0402 format. Protection is easy - a couple of resistors, a transistor and a PRF15 is all you need. Resistance increases sharply as the temperature approaches the 'trigger' temperature. Alternatively, for more complex situations, it is a simple matter to add a control circuit and thermally couple the PRF to the protected item. The reduction in size of the device reduces its thermal capacity, increasing its rate of change with temperature. This versatile POSISTOR can also be used as a thermostat, capable of switching a Transistor or FET. As an example, the notebook PC organiser can utilise about a dozen of these little sensors, because they are very simple and cheap as a second temperature sensor. Simply go to our web-site home page, Select 'Design tools' and then select 'Murata chip NTC Thermistor Output Voltage Simulator'.
Advanced components + free design tools = customer success
Murata thermistor technology is moving fast and our backup service moves with it. Our range grows and changes to meet the needs of our customers. Thermistors have been used in automotive applications almost since they were invented; but today's increasingly electronic/automated functions demand increasing levels of protection; not only in automotive. We lead the world with NTCs and invented the POSISTOR . Posistor ® There are plenty of options. From miniature chips to radial leaded. POSITORS for heater controls, self re-setting over-current protection and over-temperature protections, replace motor start resistors and degauss. Fig.1 shows a simple way to save money and space. Using a number of POSITORS in series, in thermal contact with a number of items to be protected disposes of the IC(s) and logic that would otherwise have to be accommodated and funded. NTC Thermistor NTCs suppress startup inrush currents, provide excellent temperature compensation and make good temperature sensors. Selection is easier now. You may not know about the free design facilities we provide for many products. These don't insult your intelligence, but they do cut the work you have to do to optimise your design. The latest addition is a chip NTC output voltage simulator. This is available on a free CD or as a download from www.murata.com -design tools. Without the simulator, you have maybe five different parameters to juggle. Here, you select your circuit and compare the output voltage, temperature and voltage error of two NTCs in that circuit. If you are left with questions, the file includes a form that you can send to us for expert advice and support.
Oscillator TechnologyReplace crystal oscillators in auto applications
We all know the problems with crystals oscillators! Slow starting, big and heavy, don't like the bumps, drive level problems, need a tank circuit; pricey. They used to have one advantage over ceramic resonators - frequency tolerance. That hasn't been entirely true for a while now. Tighter resonator tolerances than ever before mean that the one crystal advantage is fading, designers can increasingly take advantage of resonator pricing and performance and get the required frequency tolerance. For example, the CSTCE-G-Cand -VC series offer a frequency tolerance of ±0.3% (-40 C to 125 C), cover the range from 8.00 to 20.00MHz, weigh 12mg, occupy a 3.2x1.3 footprint 1.3mm high and are ideal for CAN-BUS applications. There are plenty of other applications for which we have designs. Operating temperature ranges up to 150 C and package sizes down to 3.2x1.3mm; progressively improving frequency accuracy and getting smaller as you read this Murata Mail. We have space here for only a short description of this dynamic development programme. Why not find out more and influence trends with details of your requirements?
SAW FiltersUHF Filters for RFID
Because cellular phones use neighboring bandwidths, filters for UHF band RFID read/write systems must be acutely selective. Our latest 900MHz Band SAW filter design (SAFCH953MA) is focused on exactly this application. RFID (Radio Frequency Identification) can handle more information than barcodes and is expected to speed-up processing at distribution and handling sites. Progressively more companies are using Supply-Chain-Management and RFID can be expected to attract their attention. Tasks like transportation, conveyance, food management, medicine and finance spring readily to mind. Standards are being prepared worldwide to come up with global standardisation policies. At present, the most-used bandwidth is the 2MHz between 952 and 954MHz. There are others and there is the prospect of more to come. Our tiny filter for this band uses a quartz substrate with good temperature characteristics and our own electrode design technology to give low loss and high attenuation. We have kept the transmission loss in the band at less than 4.5dB while maintaining attenuation of 20dB in the nearby cellular phone frequencies. All this in a 3.8x3.8x1.5mm package. Production began early this year and will hit 100,000 a month by this October.
Sensors TechnologyCar navigation sensors
Some years ago, we applied MEMS technology to high-speed data communications systems. Now, our new MEV-50A-R applies that experience to a solid-state gyroscope for automotive navigation systems. This MEMS (Micro - Electro - Mechanical Systems) design is hermetically sealed and capacitive sensing with low temperature-offset drift. It utilises a customised IC and is RoHS compliant. Conscious of the space limitations in automotive applications, the vertical rotating axis package is only 3.3mm high on a 10mmsquare base. The operating temperature range is - -40 to 85 C; start-up drift is ± 0,4 degree per second max for 1s to 5 minutes. Maximum output noise is 10mV peak to peak and dynamic range is 70° per second. Now in the early production phase, we offer engineering samples, a preliminary specification and a recommended external circuit. The unit is designed to fit an S.E.R.-made AQ0176-011 socket, details with the information package.
Sub-Miniature ConnectorImproved and new microwave connectors
Continuous development keeps Murata in the lead in connectors working at DC to 6GHz. Recent progress has introduced new miniature designs and improvements in existing products. A good example of new design is the MM4829-2700RA4 microwave coaxial connector. It offers two-point contact and a 1.2mm mounted height on a 2.0mm x 2.0mm footprint. Maximum VSWR fromDCto 3GHz is only 1.3 and from there to 6GHz 1.45. Our MM8430-2610 integrated switch and connector demonstrates recent improvement. New material in its construction increases resistance to soldering heat from 260 C to 270 C without changing any other characteristics. This design is already generally superior, offering 'wipe & touch' two-point contact; double-sided common-terminal support (most have one only), better immunity to flux invasion and better reliability. Murata comparative testing of the above products shows that our design withstands 500 insertion cycles and has typical adherence strength of 93.42 N. These results are far superior to those of competing manufacturers. Our existing range of tools is compatible with these parts enabling both automatic and manual operation, giving a choice of manual or automatic testing during production or fault finding |
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