Wielding Base Metal Yields Cheaper, Stable Class X2 Capacitors DAP-4

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Specifications	Wielding Base Metal Yields Cheaper, Stable Class X2 Capacitors DAP-4
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C apacitors directly connected to power supply primary circuits of electronic equipment are at high risk of being exposed to

Specifications	Wielding Base Metal Yields Cheaper, Stable Class X2 Capacitors DAP-4
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Content	C apacitors directly connected to power supply primary circuits of electronic equipment are at high risk of being exposed to high-voltage surges. Therefore, capaci- tors are required to obtain safety standards certification. Film capacitors and disc ce- ramic capacitors are typical products that are awarded with safety standards. The capacitors used in power supply and com- munication circuits that passed these safety standards are sought to be small in size, low in profile, can be installed using sur- face-mount method, and can be operated in high temperatures. Such features are demanded in order to meet the require- ments of weight, thickness, length, and size reduction of electronic equipment, such as personal computers and informa- tion equipment. In response to these trends, Murata Manufacturing Co., Ltd. has been de- signing high withstand voltage monolithic ceramic chip capacitors and obtaining safety standards certification for these products. In 1997, Murata introduced safety standards-certified GB Series mono- lithic ceramic chip capacitor as a Class X2 capacitor for commercial power sup- ply ahead of other manufacturers in the market. The GB Series is being mass pro- duced at present (Photo). Recently, Murata has developed a new GB Series at relatively lower cost through the use of base metal. It achieves an in- creased capacitance by means of a new inner electrode design. The features of this new product are introduced below together with the safety standards applied to the GB Series. Obtaining Safety Standards Certification Safety standards define the safety cri- teria of electronic equipment and com- ponents. Basically, products are mandated to comply with safety standards in order to protect human life and property from hazards, such as electric shock and fire, when the equipment is being used. To im- prove the safety of elec- tronic equipment, a capac- itor connected to a specific location of the device, for example, between the op- posite poles of a power sup- ply primary circuit or be- tween the power lines of a power supply primary cir- cuit and chassis ground, must be certified by safety standards. To obtain safety stan- dards certification, the product must undergo specific tests and must comply with the required criteria to receive a conformity result. In other words, the process enables a capacitor to obtain a certificate indicating conformance to the necessary standards. The GB Series is an IEC60834-14 sub- class X2 capacitor certified product. It is a monolithic ceramic chip capacitor that can be used for commercial power sup- ply equipment, such as AC adaptors and battery chargers. Table 1 presents the GB Series product lineup certified by safety standards. As the GB Series capacitors have been awarded with safety standard certificates, they can be used for audio-video equip- ment, information equipment, and home electronic appliances in major European countries. Strategy to Reduce Cost Fig. 1 provides a comparison between the materials used for the new GB Series products and Murata’s existing products. Murata’s existing products use elec- trodes made of precious metals, such as silver and palladium, involving high pro- duction costs. In the new GB Series prod- ucts, the precious metals have been re- placed with base metals to reduce the pro- duction costs. Here, nickel is used for the inner electrodes and copper is used for the base layer of the outer electrodes. Furthermore, the new GB Series prod- uct can be installed using the surface- mount method with excellent solderabil- ity and wettability as the outer electrode surface is tin-plated. 24AEINovember 2009 Wielding Base Metal Yields Cheaper, Stable Class X2 Capacitors Table 1: Safety standard certified products lineup Fig. 1: Comparison of materials used Product outline of the GB Series capacitor Copyright 2009 Dempa Publications, Inc.
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Following Datasheets	ta0991 (3 pages) ta0992 (2 pages) ta09b1 (3 pages) ta09d3 (2 pages) ta09f2 (2 pages) ta1061 (3 pages) ta1062 (3 pages) ta1071 (3 pages) ta1082 (2 pages) ta10b2 (3 pages)
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