The latest computer which densification goes ahead through, the electromagnetic noise generated in a circuit may affect other circuits, resulting in the malfunctioning of the entire computer. Murata is developing a wide range of noise suppression components for different applications. Our chip ferrite beads and EMIFIL®, three-terminal capacitors, take advantage of bandwidth differences to eliminate noise only. We are also developing common-mode choke coils for use in large-capacity, high-speed signal transmission systems, such as the differential transmission system in particular, and are able to suppress noise without disturbing the signal waveform. We are also focusing on developing application technologies based on these components to provide comprehensive noise suppression solutions.

With the introduction of multicore technology, the number-crunching power of Micro Processor Units (MPUs), the heart of a computer, has been increasing year after year. Tens of amperes of current flows through the power supply line for the MPU. The stability of this power supply is of vital importance for the computer. Murata's low-ESL capacitors (featuring low impedance at high frequencies) and small-size, large-capacity capacitors are mounted directly on the MPU package to support quick computer response and stable power supply.

Modern computers with extremely high CPU capacity have an increasing risk of excessive heat generation, since they have multiple heat sources within a small space. The resistance-temperature characteristics of the PTC thermistor (POSISTOR^®) make it an ideal protective element in this regard. Above a given temperature (Curie point), the PTC thermistor’s resistance increases by 20 to 30% for each 1℃ rise in temperature. It is therefore used in overheating detection systems and protection of electrical circuits against abnormal currents, and helps provide a comfortable computing environment protected against risks of smoke generation and fire.

As the computers become faster and larger in capacity, the track density of their hard disks becomes greater every year. Adjacent tracks are sub-microns away in the latest models. If they experience vibrations or shocks during the WRITE phase, the magnetic head could move to the adjacent track overwriting the existing data. Murata's shock sensor protects users against such a risk. When vibration is detected with a piezoelectric element, the head stops recording data temporarily to protect important data.