ceramic capacitors

Abstract

This invention provides a ceramic capacitor having a ceramic upper cover layer and a ceramic lower cover layer each with a thickness of 38 micrometers to 100 micrometers; a single ceramic intermediate layer with a thickness of 12 micrometers to 50 micrometers; an end edge of the ceramic capacitor with a thickness of 80 micrometers to 180 micrometers; an end electrode extending to the coverage area of ​​the ceramic upper cover layer or the ceramic lower cover layer with a length of 270 micrometers to 500 micrometers; and the total area of ​​the coverage area projected vertically onto the same inner electrode layer being 12.5% ​​to 25% of the top surface of the inner electrode layer. The ceramic capacitor can effectively withstand electrostatic transients of at least 8 kilovolts, thus making it an excellent electrostatic discharge protection element.

Claims

1. A ceramic capacitor comprising a ceramic body, a ceramic upper cover layer and a ceramic lower cover layer opposite to each other, and a laminate located between the ceramic upper cover layer and the ceramic lower cover layer, wherein the laminate comprises a plurality of overlapping ceramic intermediate layers and a plurality of inner electrode layers; and two end electrodes respectively disposed on opposite sides of the ceramic body, wherein each of the plurality of inner electrode layers is electrically connected to one of the two end electrodes; wherein, The thickness of the upper ceramic cover layer and the lower ceramic cover layer is each 38 micrometers to 100 micrometers; the thickness of a single layer of the plurality of ceramic intermediate layers is 12 micrometers to 50 micrometers; the end edge of the ceramic capacitor is 80 micrometers to 180 micrometers; the two end electrodes extend from opposite sides of the ceramic body to a portion of the top surface of the upper ceramic cover layer to form a first and second cover area spaced apart from each other, and the two end electrodes extend to a portion of the bottom surface of the lower ceramic cover layer to form a third and fourth cover area spaced apart from each other, and the lengths of the first, second, third, and fourth cover areas along the extension direction of the inner electrode layer are each 270 micrometers to 500 micrometers; and the total area of ​​the first and second cover areas projected vertically onto the same inner electrode layer is 12.5% ​​to 25%.

2. The ceramic capacitor as claimed in claim 1, wherein the thickness of the upper ceramic cover layer and the lower ceramic cover layer is each from 38 micrometers to 74 micrometers.

3. The ceramic capacitor as claimed in claim 1, wherein the thickness of a single layer of the plurality of ceramic intermediate layers is from 12 micrometers to 40 micrometers.

4. The ceramic capacitor as claimed in claim 1, wherein the thickness of a single layer of the plurality of inner electrode layers is from 0.8 micrometers to 1.4 micrometers.

5. The ceramic capacitor as claimed in claim 1, wherein the ceramic capacitor has a length of 1 mm to 2 mm and a width of 0.5 mm to 1.25 mm.

6. The ceramic capacitor as claimed in claim 1, wherein the ceramic capacitor is an electrostatic discharge protection element.

7. The ceramic capacitor as claimed in claim 1, wherein the ceramic capacitor is at least an electrostatic discharge protection element of the 8 kV class.

8. The ceramic capacitor as claimed in claim 1, wherein the rated voltage of the ceramic capacitor is greater than 50 volts to 200 volts.

9. The ceramic capacitor as described in claim 1, wherein the ceramic capacitor at least conforms to the EIA-X7R standard.

10. The ceramic capacitor as claimed in claim 1, wherein the dielectric constant of the ceramic capacitor is 2000 to 3000, the loss factor of the ceramic capacitor is 0.5 to 2, the capacitance of the ceramic capacitor is less than 100 nanofarads, and the insulation resistance of the ceramic capacitor is more than 1 × 10⁹ ohms.

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