Low aspect ratio varistor

Patent metadata

Field	Value
Publication number	US-10529472-B2
Application number	US-201816205271-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Dec 1, 2017
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A low aspect ratio varistor is disclosed. The varistor may have a rectangular configuration defining first and second opposing side surfaces offset in a widthwise direction and first and second opposing end surfaces offset in a lengthwise direction. The varistor may include a first electrode layer including a first electrode having an electrode length in the lengthwise direction and an electrode width in the widthwise direction. The varistor may also include a second electrode layer including a second electrode having an electrode length in the lengthwise direction and an electrode width in the widthwise direction. The varistor may also include first and second terminals adjacent and connected with the first and second opposing end surfaces, respectively. At least one of the first or second electrodes may have an electrode aspect ratio less than about 1.

First claim

What is claimed is:

1. A varistor having a rectangular configuration defining first and second opposing side surfaces offset in a widthwise direction and first and second opposing end surfaces offset in a lengthwise direction, the varistor comprising:
a first terminal adjacent the first opposing end surface;
a first electrode layer including a first electrode having an electrode length in the lengthwise direction and an electrode width in the widthwise direction, the first electrode connected with the first terminal along the electrode width of the first electrode;
a second terminal adjacent the second opposing end surface; and
a second electrode layer including a second electrode having an electrode length in the lengthwise direction and an electrode width in the widthwise direction, the second electrode connected with the second terminal along the electrode width of the second electrode;
wherein:
at least one of the first or second electrodes has an electrode aspect ratio less than about 1.

2. The varistor of claim 1 , wherein a clamping voltage of the varistor is less than about 12 volts.

3. The varistor of claim 1 , wherein:
the first electrode overlaps the second electrode in both the widthwise and lengthwise directions to define an overlapping area having an overlap width in the widthwise direction and an overlap length in the lengthwise direction; and
the overlapping area has an overlap aspect ratio less than about 1.

4. The varistor of claim 1 , further comprising:
an overall length in the lengthwise direction between the first and second opposing end surfaces and an overall width in the widthwise direction between first and second opposing side surfaces; and
an overall aspect ratio less than about 1.

5. The varistor of claim 1 ; wherein at east one of the first electrode or second electrode is a T-electrode.

6. The varistor of claim 1 , wherein the first terminal is connected with the first electrode along at least one of the first opposing side surface or second opposing side surface of the varistor.

7. The varistor of claim 1 , wherein at least one of the first electrode or second electrode intersects at least one of the first opposing side surface or second opposing side surface.

8. A varistor having a rectangular configuration defining first and second opposing side surfaces offset in a widthwise direction and first and second opposing end surfaces offset in a lengthwise direction, the varistor comprising:
a first terminal adjacent the first opposing end surface;
a first electrode layer including a first electrode, the first electrode connected with the first terminal; and
a second terminal adjacent the second opposing end surface; and
a second electrode layer including a second electrode; the second electrode connected with the second terminal;
wherein:
the second electrode overlaps the first electrode along an overlapping area having an overlap width in the widthwise direction and an overlap length in the lengthwise direction; and
the overlapping area has an overlap aspect ratio less than about 1.

9. The varistor of claim 8 , further comprising:
an overall length in the lengthwise direction between the first and second opposing end surfaces and an overall width in the widthwise direction between first and second opposing side surfaces; and
an overall aspect ratio less than about 1.

10. The varistor of claim 8 , wherein a clamping voltage of the varistor is less than about 12 volts.

11. The varistor of claim 8 , wherein at least one of the first electrode or second electrode is a T-electrode.

12. The varistor of claim 8 , wherein the first terminal is connected with the first electrode along at least one of the first opposing side surface or second opposing side surface of the varistor.

13. The varistor of claim 8 , wherein at least one of the first electrode or second electrode intersects at least one of the first opposing side surface or second opposing side surface.

14. A varistor array having a rectangular configuration defining first and second opposing side surfaces offset in a widthwise direction and first and second opposing end surfaces offset in a lengthwise direction, the varistor array comprising:
a first terminal associated with the first opposing end surface;
a first electrode layer including a first set of electrodes, each of the first set of electrodes being connected with the first terminal and having an electrode length in the lengthwise direction and an electrode width in the widthwise direction;
a second terminal associated with the second opposing end surface; and
a second electrode layer including a second set of electrodes, each of the second set of electrodes being connected with the second terminal and having an electrode length in the lengthwise direction and an electrode width in the widthwise direction;
wherein:
at least one electrode of the first set of electrodes or second set of electrodes has an electrode aspect ratio less than about 1.

15. The varistor array of claim 14 , wherein:
at least one of the electrodes of the first set of electrodes overlaps at least one of the electrodes of the second set of electrodes in the lengthwise and widthwise directions to define an overlapping area having an overlap width in the widthwise direction and an overlap length in the lengthwise direction; and
the overlapping area has an overlap aspect ratio less than about 1.

16. The varistor array of claim 14 , further comprising:
an overall length in the lengthwise direction between the first and second opposing end surfaces and an overall width in the widthwise direction between the first and second opposing side surfaces; and
an overall aspect ratio less than 1.

17. The varistor array of claim 14 , wherein at least one of the first set of electrodes or second set of electrodes is a T-electrode.

18. The varistor array of claim 14 , wherein the first terminal is connected with the first electrode along at least one of the first opposing side surface or second opposing side surface of the varistor.

19. The varistor array of claim 14 , wherein at least one of the first set of electrodes or second set of electrodes intersects at least one of the first opposing side surface or second opposing side surface.

20. The varistor array of claim 14 , wherein the clamping voltage between the first terminal and second terminal of the varistor array is less than about 12 volts.

Assignees

• Avx Corp

Inventors

• Kirk Michael
• Berolini Marianne
• Ravindranathan Palaniappan

Classifications

• H01C7/18

  comprising a plurality of layers stacked between terminals · CPC title

• H01C7/12 Primary

  Overvoltage protection resistors; Arresters · CPC title

• H01C1/16

  Resistor networks not otherwise provided for · CPC title

• H01C7/1006 Primary

  Thick film varistors · CPC title

• H01C1/142

  the terminals or tapping points being coated on the resistive element · CPC title