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Use this drop-down menu to jump to all the product news stories from the Spring 2008 issue of Murata Mail. Resonator TechnologyNew SAW resonator family
Murata is proud to announce the availability of a new family of SAW resonators dedicated to Short Range Devices (SRD) operating in the ISM300 and ISM400 bands: SARCC***M**K(T)X*0. After almost four years since Murata first introduced the three millimeter square package, brand new technology has meant further performance improvements thanks to the efforts of the Kanazawa R & D department. All three of the resonator's main parameters have been improved: the thermal coefficient has been reduced by almost 50%, the resonant loss has improved by approximately 1dB, and the standard initial tolerance is now ±50kHz compared to a typical ±75kHz of the previous device. Upon request, it is also possible to offer a ±50ppm type. The new family will support to achieve the latest ETSI (European Telecommunications Standards Institute) standard concerning frequency error. This in contrast to our competitors who do not have a solution yet that enables them to comply to the standard. The new family, which covers all the most requested frequencies, is available in the standard 3.0x3.0mm size, 6 pin ceramic package and is backward compatible to old devices. Two temperature ranges are available and are named using different suffix: the “KX” is intended for the consumer market and the “TX” offers automotive grade devices suitable for example, for TPMS (Tire Pressure Monitoring System). Last but not least, Murata has decided to apply an aggressive pricing policy and has kept the cost of the newer series similar to the older series with the added assurance of a cost benefit for medium and long term business.
Coil TechnologyRealizing the industry's highest Q
Murata has commercialized a large inductance model for film type ultra small chip coil at 0.6x0.3x0.3mm (EIA Code: 0201size), ideal for high frequency circuits used in compact mobile equipment such as mobile phones: the LQP03 series. A very high Q value at inductance range of 68nH 120nH was realized in the ultra small 0201 size through re-evaluation of the internal structuring and using Murata's own cutting-edge micro-fabrication to form an optimal coil for very small products. Increasing the maximum inductance of the 0201 size chip coil from 56nH to 120nH will contribute to expansion of the scope of applications as well as the production of smaller and thinner electronic equipment. Murata's latest processing technology was applied in order to realize the industry's highest class in terms of high Q in high frequency range, as well as stable inductance in spite of the small 0201 size. Currently, the inductance tolerance is ±5%. We are developing new models of tighter tolerance to add to the current line up. No substance banned by the RoHS directive is used in this product range. With the advance and trend towards more smaller, multi-functional mobile communication equipment including mobile phones, the total number of components used is on the increase. Furthermore, as this type of equipment becomes increasingly smaller in size and profile then the downsizing of chip coils will be necessary. Additionally, the high frequency region in small mobile communication equipment requires a highQin a high frequency range in order to suppress signal attenuation.
Sub-miniature connectorHSC- series cable connector
Murata's innovation in the field of connectors has no end. Recently we introduced our new microwave coaxial connectors; the MXHP32 type cable connector and MM4829-2702 receptacle. At a mating height of only 1.2mm maximum and a footprint of 2.0x2.0mm the new MM4829-2702 has exactly the same size as it's predecessor and both parts are fully compatible. It provides high performance in a wide frequency range (DC to 6GHz), V.S.W.R. at DC to 3GHz is 1.3 maximum, V.S.W.R. at 3GHz to 6GHz is 1.45 maximum. Insertion of nickel plating stripes in the center pin prevents solder from shifting to the contact point. Murata's superior design capability led to the development of the MXHP32 type cable connector. Below figures show the new type product modifications:
Murata's design withstands 30 insertion cycles and has typical adherence strength of 39 N. All comes with a range of handling tools compatible to these parts making both automatic and manual operation possible.
Piezoelectric TechnologyTight tolerance CERALOCK® for automotive
Think Murata when you think automotive and check out the ceramic resonator CSTCR-G-C, CSTCE-G-C and CSTCE-V-C series. The conventional ceramic resonator exhibits relatively larger variations in temperature characteristics and materials. Therefore, the total frequency tolerance was generally ±1.0 to 2.0%. The frequency tolerance is sufficient for microcomputer operation, but is not sufficient when it is used as a communication clock. In order to realize tighter frequency tolerance we developed materials with flatter temperature characteristics by combining conventional ceramic material development technology and design technology. Furthermore, continued improvement of our original ceramic processing technology has resulted in our ceramic resonators exhibiting smaller initial frequency tolerance than conventional components. As a result, we have made remarkable progress in applying our ceramic resonators to automotive LAN applications. Figure 2 shows the tight tolerance CERALOCK , CSTCR-G-C, CSTCEG-C and CSTCE-V-C series for the automotive market. These products are available in CAN-BUS. The total frequency tolerance of the conventional CERALOCK was ±9,000 ppm. In this tight tolerance series, the total frequency tolerance is ±3,000 ppm. The items of the frequency tolerance are: initial frequency tolerance, frequency shift by temperature (-40 to +125 deg.C) and frequency aging. Future Technical Trend and Directions In the future, more and more ECUs in automobiles will be connected with automotive LANs, mainly CAN BUS. Murata has been developing products with tighter frequency tolerance to cover all CANBUS clock.
EMI FiltersHigh-impedance, small chip ferrite beads
Murata is boasting the industry's highest impedance in the 0603 (0201 EIA) size, at 0.6 x 0.3 x 0.3mm L xWx T by commercializing the BLM03AG102SN1 chip ferrite bead. This product is a small chip ferrite bead having the industry-highest impedance of 1000Ω (at 100MHz). Replacing the existing 1005 size chip ferrite beads with the new 0603 (0201 EIA) size model realizes the smaller size of components and reduces mounting space by approximately 60%. In this way, it can contribute significantly to making the equipment in which they are used smaller and lighter in weight, and is expected to have higher noise suppression effect in products that require compactness and space efficiency, such as power amplifier modules for mobile phones. We have realized higher impedance at 0603 (0201 EIA) size by improving the coil structure in the element using ferrite multilayer technology that Murata has been nurturing. There are five items in the line up of Murata's BLM03A series, with impedance values of 10, 70, 120, 240 and 600O (at 100MHz) for noise suppression on general signal lines and already in mass production. Chip ferrite beads are widely used for noise filters to suppress EMI or prevent abnormal oscillation in various types of electronic equipment. Murata has been commercializing and properties to accommodate those applications. Since electronic equipment has become smaller with more advanced features, there are greater demands for smaller and more effective noise filters to suppress EMI. Murata has commercialized the 1005 (0402 EIA) size chip fer rite beads of impedance 1000Ω (at 100MHz), but the demands for smaller and higher impedance components are becoming stronger. Murata increased the impedance of its existing 0603 (0201 EIA) size products and to reduce the size of its existing 1005 size. As a result, we have succeeded in achieving the 0603 (0201 EIA) size an impedance 1000Ω (at 100MHz).
Thermistor TechnologyTo serve and to protect
Protection of your circuitry and IC's (PowerMOSFETs) against over-heating has never been so easy with Murata's chip PTC thermistors (POSISTOR ), the PRF18 series e.g. the PRF18BB471QB5RB. The latest in line is just 1.6mm long, 0.8mm high and has 2 temperature sensing points. This SMD type is very useful when size and weight matter. Due to the small size the thermal response is excellent and the solid construction provides top mechanical vibration-and impact resistance. The sensing temperature at 4.7kohm is 65-145°C ±5°C and now at 47kohm 80-150°C ±7°C. Sensing multiple points is easy when PRF's are connected in serie, and work like an automatic overheat sensing system for each point. The sensing temperature can be removed, added or changed without changing the control IC and circuit.
Murata expanded its line of thermistors for over-current protection. The series you need are the PRG18 and/or the PRG21 series. Murata's range of PRG18/21 is now additionally offering 180mA, 220mA, 330mA, 420mA of hold current at 25 °C in an 0805 format (PRG21) and also providing 120mA, 155mA of hold current at 25 °C in the smaller 0603 case size (PRG18). Just install your Posistor ® in line and it works as a resettable fuse against over-current. Small size, price and excellent stabillity are the key advantages over polymer PTCs. The Murata thermistors protect your application across a wide range of hold and trip current values. |
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