| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a small size stacked varistor which can control a varistor voltage to a lower voltage, has voltage nonlinear characteristics and limiting the voltage characteristics, with small leakage current, provide a large surge current resistance, and to obtain superior static discharge proof characteristics. <P>SOLUTION: The stacked varistor has a ceramic sintered body which is mainly composed of ZnO, an internal electrode formed inside the ceramic sintered body and an external electrode formed on the external surface of the ceramic sintered body. The ceramic sintered body is doped, with ZnO of 100 mol, of Co of 0.05 to 5 mol in terms of CoO, Mn of 0.001 to 5 mol in terms of MnO, and at least one kind of either Sr or Ba of 0.01 to 5 mol in terms of SrO, BaO. More preferably, W of 0.001 to 1 mol in terms of WO<SB>3</SB>is doped and as the Co element and Mn element, the Co<SB>3</SB>O<SB>4</SB>and Mn<SB>3</SB>O<SB>4</SB>of average grain size of 25 to 100 nm are used. <P>COPYRIGHT: (C)2004,JPO |
