Murata's conductive adhesive-based automotive sheet-like multilayer ceramic capacitors are commercialized

Chip ceramic capacitor

6035 18.432 ceramic

Photocoupler

Electronic equipment installed in a harsh temperature environment such as around the engine compartment of a car requires high reliability and high heat resistance. Murata Manufacturing Co., Ltd. (hereinafter referred to as " Murata "), a leading global electronic component manufacturer, has developed a new external electrode by utilizing the advantages of high temperature resistance of ceramics, and has successfully developed electrical conductivity that can work even in high temperature environments exceeding 150 °C. Carbide multilayer ceramic capacitor GCB series for adhesives.

Figure 1. GCB Series Appearance

In recent years, in order to improve safety and environmental protection considerations, electronic control devices of various functions in the automotive industry have developed rapidly, electronic devices have been increasingly loaded, and electronic devices carried in engine compartments have been increasingly exposed. In a harsh high temperature environment. Temperatures around components mounted near heat sources such as ICs sometimes exceed 150 °C, posing a significant challenge to the life of components.

Conductive adhesives can alleviate the expansion and contraction of boards and components caused by temperature changes, and have a long high temperature cycle working life. Murata has developed a new high-temperature advantage of ceramics. Through the development of new external electrodes, it has successfully developed a GCB series of sheet-like multilayer ceramic capacitors with a maximum operating temperature of 200 ° C and can be encapsulated with conductive adhesives. The use of circuit work in the environment.

Murata's GCB series of external electrodes are electroplated with Ni/Pd, making it the world's first dedicated line of conductive adhesives. This plating structure ensures high adhesion reliability with a conductive adhesive even in a high temperature environment. In addition, since the external electrode is not made of Ag, the short-circuit failure caused by the high-temperature migration of Ag in the existing conductive adhesive-dedicated product (GCG series) can be greatly reduced, and the heat resistance higher than that of the existing product can be achieved.

When the GCB series product and the existing product (GCG series) are placed together in a high temperature environment of 200 ° C, the resistance value between the terminal electrode and the ground is shown in FIG. 3 . As can be seen from the figure, although the value of the connection resistance is increasing with the increase of the standing time, the increase rate of the resistance value of the GCB series products developed by Murata is smaller than that of the existing products, so it has more Excellent characteristics.

In addition to being able to cope with existing products with a maximum operating temperature of 150 ° C, Murata has also commercialized products with a maximum operating temperature of 200 ° C. Both are in line with the reliability test specification AEC-Q200 (the automotive component reliability test specification developed by Automotive Electronics Co., Ltd.) required for automotive components, and are suitable for power transmission systems and safety equipment installed in automotive high temperature environments.

Table 1. GCB Series Product Lineup and Electrical Characteristics

*1 Example of product name: product under development, and informal product name.

It is understood that the Murata GCB series has begun sample supply and is expected to be mass-produced during the year. Compared with existing products, the GCB series has excellent corrosion resistance of its external electrodes in addition to its high temperature environment. At the same time as providing solutions that take advantage of the new external electrodes, Murata will further expand its product lineup and contribute to the development of the electronics industry.