JP7062379B2 - NTC thermistor - Google Patents

Description

The present invention relates to an NTC thermistor.

A thermistor prime field having a pair of main surfaces, a pair of end faces, and a pair of side surfaces, a pair of terminal electrodes formed on the end face side of the thermistor prime field, and electrical to the corresponding terminal electrodes arranged in the thermistor prime field. NTC thermistors are known to include first and second internal electrodes that are connected to and face each other in opposite directions of a pair of main surfaces (eg, Patent Documents 1 to 3).

International Publication No. 2015/008500 Japanese Patent Application Laid-Open No. 2003-124007 Japanese Unexamined Patent Publication No. 2016-54225

In the NTC thermistor as described above, the first and second internal electrodes laminated in the thermistor body are misaligned, so that the first internal electrode and the second internal electrode overlap each other when viewed from the stacking direction. The area fluctuates. There is a problem that this fluctuation affects the resistance value and the resistance value tends to vary.

An object of the present invention is to provide an NTC thermistor in which variation in resistance value is suppressed.

The NTC thermister according to the present invention has a pair of main surfaces facing each other in the first direction, a pair of end faces facing each other in the second direction orthogonal to the first direction, and a second electrode orthogonal to the first direction and the second direction. A thermista element having a pair of side surfaces facing each other in three directions, first and second terminal electrodes arranged on the corresponding end faces, and a first arranged in the thermista element and facing each other in the first direction. And a second internal electrode, the first internal electrode is electrically connected to the first terminal electrode and connects between a pair of facing portions facing each other in the third direction and a pair of facing portions. The second internal electrode has a proximal end portion electrically connected to the second terminal electrode, a distal end portion located at the distal end on the first terminal electrode side, and a proximal end portion. It has a narrow portion extending between the tip portion and having a width in the third direction narrower than the separation width in the third direction of the pair of facing portions, and is viewed from the first direction. The entire tip portion is located in a region surrounded by the pair of facing portions and the connecting portion, and the second internal electrode overlaps the connecting portion in the narrow portion.

In the NTC thermistor according to the present invention, the second internal electrode overlaps the connecting portion of the first internal electrode in a narrow portion when viewed from the first direction. The width of the narrow portion in the third direction is narrower than the separation width in the third direction of the pair of facing portions to which the connecting portions are connected, and is wider than the connecting width when viewed from the first direction. The narrow narrow part has entered the connecting part. Therefore, even if the second internal electrode is displaced in the third direction with respect to the first internal electrode, there is little possibility that the narrow portion protrudes from the connecting portion in the third direction, and the first internal electrode is viewed from the first direction. The area of the region where the second internal electrode and the second internal electrode overlap each other is less likely to fluctuate. When viewed from the first direction, the entire tip portion of the second internal electrode is located in the region surrounded by the pair of facing portions and the connecting portion in the first internal electrode. Therefore, the second internal electrode is in a state of straddling the first internal electrode in the second direction. As a result, even if the second internal electrode is displaced in the second direction with respect to the first internal electrode, the area of the region where the first internal electrode and the second internal electrode overlap each other when viewed from the first direction fluctuates. It's getting harder. From the above, even if the first and second internal electrodes are displaced in either the second direction or the third direction, the area where the first internal electrode and the second internal electrode overlap each other when viewed from the first direction The variation in area is suppressed, and as a result, the variation in resistance value is suppressed.

The NTC thermistor according to the present invention has a pair of main surfaces facing each other in the first direction, a pair of end faces facing each other in the second direction orthogonal to the first direction, and a second orthogonal surface in the first direction and the second direction. A thermistor element having a pair of sides facing each other in three directions, first and second terminal electrodes arranged on the corresponding end faces, and corresponding first and second terminal electrodes arranged within the thermistor element. The first and second internal electrodes are electrically connected to and face each other in the first direction, and the first internal electrodes are a conductor portion and an opening formed inside the conductor portion. The second internal electrode has a narrow portion whose width in the third direction is narrower than the width in the third direction of the opening, and is connected to the narrow portion and is connected to the narrow portion and on the side of the second terminal electrode. It has a tip located at the tip, the entire tip is located in the opening when viewed from the first direction, and the second internal electrode overlaps the conductor in the narrow portion. ing.

In the NTC thermistor according to the present invention, the second internal electrode overlaps the conductor portion of the first internal electrode in a narrow portion when viewed from the first direction. The width of the narrow portion in the third direction is narrower than the width of the opening formed inside the conductor portion of the first internal electrode in the third direction, and the conductor is viewed from the first direction. A narrow portion narrower than the portion has entered the conductor portion. Therefore, even if the second internal electrode is displaced in the third direction with respect to the first internal electrode, there is little possibility that the narrow portion protrudes from the conductor portion in the third direction, and the first internal electrode is viewed from the first direction. The area of the region where the second internal electrode and the second internal electrode overlap each other is less likely to fluctuate. When viewed from the first direction, the entire tip of the second internal electrode is located within the opening in the first internal electrode. Therefore, the second internal electrode is in a state of straddling the first internal electrode in the second direction. As a result, even if the second internal electrode is displaced in the second direction with respect to the first internal electrode, the area of the region where the first internal electrode and the second internal electrode overlap each other when viewed from the first direction fluctuates. It's getting harder. From the above, even if the first and second internal electrodes are displaced in either the second direction or the third direction, the area where the first internal electrode and the second internal electrode overlap each other when viewed from the first direction The variation in area is suppressed, and as a result, the variation in resistance value is suppressed.

According to the present invention, it is possible to provide an NTC thermistor in which variation in resistance value is suppressed.

It is a perspective view of the chip NTC thermistor which concerns on embodiment. It is sectional drawing of the chip NTC thermistor of FIG. It is sectional drawing of the chip NTC thermistor of FIG. It is a top view of the internal electrode contained in the thermistor element body shown in FIG. It is a perspective view of the chip NTC thermistor which concerns on the modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and duplicate explanations will be omitted.

First, the chip NTC (Negative Temperature Coefficient) thermistor 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the chip NTC thermistor 1 according to the embodiment. FIG. 2 is a cross-sectional view of the chip NTC thermistor 1 along the line II-II shown in FIG. FIG. 3 is a cross-sectional view of the chip NTC thermistor 1 along the line III-III shown in FIG. FIG. 4 is a plan view showing the internal electrodes 5 and 6 contained in the thermistor prime field 2 shown in FIG.

As shown in FIGS. 1 to 4, the chip NTC thermistor 1 is arranged in the thermistor element 2, a pair of terminal electrodes 3 and 4 arranged on the outer surface of the thermistor element 2, and the thermistor element 2. The internal electrodes 5 and 6 are provided. The chip NTC thermistor 1 is a laminated NTC thermistor, which is a thermistor whose resistance decreases (has a negative temperature coefficient) with respect to an increase in temperature.

The thermistor prime field 2 has a substantially rectangular parallelepiped shape. The substantially rectangular parallelepiped shape includes not only a rectangular parallelepiped shape but also, for example, a rectangular parallelepiped shape with rounded corners. Hereinafter, the thickness direction of the thermistor element 2 will be described as the first direction X, the length direction of the thermistor element 2 as the second direction Y, and the width direction of the thermistor element 2 as the third direction Z. The first direction X, the second direction Y, and the third direction Z are orthogonal to each other.

The thermistor prime field 2 has a pair of main surfaces 2a and 2b, a pair of end surfaces 2c and 2d, and a pair of side surfaces 2e and 2f as outer surfaces. The pair of main surfaces 2a and 2b have a substantially rectangular shape and face each other in the first direction X. The pair of end faces 2c and 2d have a substantially rectangular shape and face each other in the second direction Y. The pair of side surfaces 2e and 2f have a substantially rectangular shape and are orthogonal to each other in the third direction Z. The substantially rectangular shape includes not only a rectangular shape but also, for example, a rectangular shape with rounded corners.

The thermistor prime field 2 has a plurality of thermistor layers 21 laminated in the first direction X. The plurality of thermistor layers 21 are integrated to the extent that the boundaries between them cannot be visually recognized to form the thermistor prime field 2. The thermistor layer 21 is made of an NTC thermistor material that can function as an NTC thermistor. The thermistor layer 21 is formed of, for example, ceramics containing metal oxides of Mn, Ni, and Co as main components. The thermistor layer 21 contains Fe, Cu, Al, Zr and the like as subcomponents in order to adjust the characteristics (resistance change rate) in addition to the metal oxides of Mn, Ni and Co which are the main components. You may. The thermistor layer 21 may be formed of Mn and Ni metal oxides or Mn and Co metal oxides instead of the Mn, Ni and Co metal oxides. The thermistor layer 21 has a predetermined B constant.

The terminal electrode 3 (first terminal electrode) is arranged on the end face 2c of the thermistor prime field 2. The terminal electrode 3 is formed so as to cover the entire end surface 2c and each portion on the end surface 2c side of each of the main surfaces 2a and 2b and the side surfaces 2e and 2f. That is, the terminal electrode 3 has electrode portions 3a to 3e. The electrode portion 3a is a portion of the terminal electrode 3 located on the entire surface of the end surface 2c. The electrode portion 3b is a portion of the terminal electrode 3 located at the end portion of the main surface 2a on the end surface 2c side. The electrode portion 3c is a portion of the terminal electrode 3 located at the end portion of the main surface 2b on the end surface 2c side. The electrode portion 3d is a portion of the terminal electrode 3 located at the end portion of the side surface 2e on the end surface 2c side. The electrode portion 3e is a portion of the terminal electrode 3 located at the end portion of the side surface 2f on the end surface 2c side.

The terminal electrode 4 (second terminal electrode) is arranged on the end face 2d of the thermistor prime field 2. The terminal electrode 4 is formed so as to cover the entire end surface 2d and each portion on the end surface 2d side of each of the main surfaces 2a and 2b and the side surfaces 2e and 2f. That is, the terminal electrode 4 has electrode portions 4a to 4e. The electrode portion 4a is a portion of the terminal electrode 4 located on the entire surface of the end surface 2d. The electrode portion 4b is a portion of the terminal electrode 4 located at the end portion of the main surface 2a on the end surface 2d side. The electrode portion 4c is a portion of the terminal electrode 4 located at the end portion of the main surface 2b on the end surface 2d side. The electrode portion 4d is a portion of the terminal electrode 4 located at the end portion of the side surface 2e on the end surface 2d side. The electrode portion 4e is a portion of the terminal electrode 4 located at the end portion of the side surface 2f on the end surface 2d side.

The terminal electrodes 3 and 4 have the same shape as each other. The terminal electrodes 3 and 4 may be, for example, a noble metal such as Ag, Pd, Au or Pt and an alloy thereof, or a base metal such as Cu or Ni and an alloy thereof. The terminal electrodes 3 and 4 may contain a glass component. The content of the glass component is, for example, 10% by weight or less. The terminal electrodes 3 and 4 may have a Ni plating layer and a Sn plating layer on the surface in order to facilitate surface mounting by soldering.

The internal electrodes 5 and 6 are arranged between the thermistor layers 21. Similar to the terminal electrodes 3 and 4, the internal electrodes 5 and 6 may be precious metals such as Ag, Pd, Au and Pt and alloys thereof, and base metals such as Cu and Ni and alloys thereof. May be good.

The internal electrode 5 (first internal electrode) is electrically connected to the terminal electrode 3. The internal electrode 5 has a rectangular annular shape having a substantially rectangular outer shape and an inner shape. The substantially rectangular shape includes not only a rectangular shape but also, for example, a rectangular shape with rounded corners.

The outer shape of the internal electrode 5 is divided into a side 5a along the side surface 2e, a side 5b along the end surface 2d, a side 5c along the side surface 2f, and a part of the end surface 2c. The outer corner portion R1 where the side 5a and the side 5b intersect and the outer corner portion R2 where the side 5b and the side 5c intersect are rounded, respectively. That is, the internal electrode 5 has outer corner portions R1 and R2 that are rounded when viewed from the first direction X as corner portions.

The inner shape of the internal electrode 5 is along the side surface 2e and inside the side 5a, along the end surface 2d and inside the side 5b, and along the side surface 2f and inside the side 5c. It is partitioned by 5f and a side 5g along the end face 2c. The internal angle portion R3 where the side 5d and the side 5e intersect, the internal angle portion R4 where the side 5e and the side 5f intersect, the internal angle portion R5 where the side 5f and the side 5g intersect, and the side 5g and the side 5d intersect. The internal angle portions R6 are each rounded. That is, the internal electrode 5 has internal angle portions R3 to R6 that are rounded when viewed from the first direction X as corner portions.

The internal electrode 5 has a conductor portion 10 and an opening portion 10a formed inside the conductor portion 10. The conductor portion 10 has a base end portion 11, a pair of facing portions 12, 12 and a connecting portion 13, which are integrally formed with each other.

The base end portion 11 is a portion of the conductor portion 10 located on the terminal electrode 3 side. The base end portion 11 is exposed to the end surface 2c and is directly connected to the terminal electrode 3. The pair of facing portions 12, 12 are portions of the conductor portion 10 located between the base end portion 11 and the connecting portion 13. The pair of facing portions 12, 12 extend from the base end portion 11 toward the end surface 2d side in the second direction Y and face each other in the third direction Z. Each facing portion 12 is electrically connected to the terminal electrode 3 via the proximal end portion 11. The width of each facing portion 12 in the third direction Z is narrower than the width of the proximal end portion 11 in the third direction Z. The pair of facing portions 12, 12 are separated from each other by the separation width W1 in the third direction Z. The separation width W1 of the pair of facing portions 12 is equal to the width of the opening 10a in the third direction Z. The connecting portion 13 is a tip portion of the conductor portion 10 located on the terminal electrode 4 side. The connecting portion 13 extends in the third direction Z between the pair of facing portions 12, 12 and connects between the pair of facing portions 12, 12.

The internal electrode 6 (second internal electrode) is electrically connected to the terminal electrode 4. The internal electrode 6 has a substantially rectangular shape. The substantially rectangular shape includes not only a rectangular shape but also, for example, a rectangular shape with rounded corners.

The outer shape of the internal electrode 6 is divided into a side 6a along the side surface 2e, a side 6b along the end surface 2c, a side 6c along the side surface 2f, and a part of the end surface 2d. The outer corner portion R7 where the side 6a and the side 6b intersect and the outer corner portion R8 where the side 6b and the side 6c intersect are rounded, respectively. That is, the internal electrode 6 has outer corner portions R7 and R8 that are rounded when viewed from the first direction X as corner portions.

The internal electrode 6 has a base end portion 14, a tip end portion 15, and a narrow portion 16 integrally formed with each other. The base end portion 14 is a portion of the internal electrode 6 located on the terminal electrode 4 side. The base end portion 14 is exposed to the end surface 2d and is directly connected to the terminal electrode 4. The base end portion 14 extends between the end face 2d and the side 5b in the second direction. The base end portion 14 has a width narrower than the separation width W1 in the third direction Z.

The tip portion 15 is a portion of the internal electrode 6 located at the tip on the terminal electrode 3 side. The tip portion 15 is connected to the narrow portion 16 and extends into the opening portion 10a on the terminal electrode 3 side of the side 5e. The tip portion 15 has substantially the same width as the base end portion 14, that is, a width narrower than the separation width W1 in the third direction Z. When viewed from the first direction, the entire tip portion 15 is located in the opening portion 10a. In other words, the entire tip portion 15 is located in the region S surrounded by the pair of facing portions 12, 12 and the connecting portion 13. In the present embodiment, the region S is a region in the opening 10a partitioned by the sides 5d to 5g, and is surrounded by the base end portion 11 in addition to the pair of facing portions 12, 12 and the connecting portion 13. .. The region S is filled with the thermistor layer 21.

The narrow portion 16 is a portion of the internal electrode 6 extending between the base end portion 14 and the tip end portion 15. The narrow portion 16 overlaps the connecting portion 13 when viewed from the first direction X. That is, the internal electrode 6 overlaps the connecting portion 13 of the internal electrode 5 in the narrow portion 16 when viewed from the first direction X. The narrow portion 16 has substantially the same width as the base end portion 14 and the tip end portion 15, that is, a width W2 narrower than the separation width W1 in the third direction Z. The narrow portion 16 is located inside the connecting portion 13 when viewed from the first direction X.

The internal electrode 5 and the internal electrode 6 overlap each other only in the overlapping region B (hereinafter, simply referred to as “overlapping region B”) in which the narrow portion 16 and the connecting portion 13 overlap each other when viewed from the first direction X. .. That is, the internal electrode 6 does not overlap the pair of facing portions 12, 12 and the base end portion 11 which are portions other than the connecting portion 13 in the internal electrode 5 when viewed from the first direction X. The overlapping region B is partitioned by a side 5b and a side 5e of the internal electrode 5 and a side 6a and a side 6c of the internal electrode 6.

The thermistor prime field 2 has a characteristic portion A at a portion of the thermistor prime field 2 sandwiched between the internal electrode 5 and the internal electrode 6 in the first direction X. The characteristic portion A is a portion that exhibits the characteristics of the chip NTC thermistor 1. The chip NTC thermistor 1 functions as an NTC thermistor by utilizing the temperature change of the resistance value of the characteristic unit A. In the present embodiment, the chip NTC thermistor 1 includes two internal electrodes 5 and one internal electrode 6, and the thermistor prime field 2 has two characteristic portions A. The characteristic portion A is formed in the overlapping region B when viewed from the first direction X.

Subsequently, the action and effect of the chip NTC thermistor 1 of the present embodiment will be described as compared with the conventional chip NTC thermistor. In the conventional chip NTC thermistor, the area of the region where the plurality of internal electrodes overlap each other when viewed from the stacking direction fluctuates due to the misalignment of the plurality of internal electrodes laminated in the thermistor body. There is a problem that this fluctuation affects the resistance value and the resistance value tends to vary.

On the other hand, according to the chip NTC thermistor 1 according to the present embodiment, the internal electrode 6 overlaps the connecting portion 13 of the internal electrode 5 in the narrow portion 16 when viewed from the first direction X. The width W2 of the narrow portion 16 is narrower than the separation width W1, and the narrow portion 16 narrower than the connecting portion 13 is inserted into the connecting portion 13 when viewed from the first direction X. Therefore, even if the internal electrode 6 is displaced in the third direction Z with respect to the internal electrode 5, there is little possibility that the narrow portion 16 protrudes from the connecting portion 13 in the third direction Z, and the area of the overlapping region B fluctuates. It's getting harder. When viewed from the first direction X, the entire tip portion 15 of the internal electrode 6 is located in the region S. Therefore, the internal electrode 6 is in a state of straddling the internal electrode 5 in the second direction Y. As a result, even if the internal electrode 6 is displaced in the second direction Y with respect to the internal electrode 5, the area of the overlapping region B is less likely to fluctuate. From the above, even if the internal electrodes 5 and 6 are displaced in either the second direction Y or the third direction Z, the fluctuation of the area of the overlapping region B is suppressed. Seen from the first direction X, the characteristic portion A of the thermistor prime field 2 is formed in the overlapping region B in which such an area fluctuation is suppressed. As a result, the variation in the resistance value in the chip NTC thermistor 1 is suppressed.

According to the chip NTC thermistor 1, since the internal electrodes 6 do not overlap the pair of facing portions 12, 12 when viewed from the first direction X, the fluctuation of the area of the overlapping region B is surely suppressed.

According to the chip NTC thermistor 1, since the region S is filled with the thermistor layer 21, the generation of pores (filling defects) in the thermistor prime field 2 is suppressed.

According to the chip NTC thermistor 1, the internal electrode 5 has rounded outer corners R1 and R2 and inner corners R3 to R6 as corners, and the inner electrode 6 has rounded outer corners R7 and R8 as corners. Therefore, it is difficult for the electric field distribution to concentrate in these corner regions. As a result, the possibility that electric discharge is generated in these corner regions and the insulation state is destroyed is suppressed.

According to the chip NTC thermistor 1, the overlapping region B is partitioned by the sides 5b and 5e of the internal electrode 5 and the sides 6a and 6c of the internal electrode 6. For example, since the overlapping region B is formed at a linear portion rather than at an area defect such as the outer corner portions R1, R2, R7, R8 of the internal electrodes 5 and 6, the area of the overlapping region B fluctuates. It is more reliably suppressed.

FIG. 5 is a perspective view of the chip NTC thermistor 1A according to the modified example. The chip NTC thermistor 1A according to the modified example has the same elements and structures as the chip NTC thermistor 1, and is different from the chip NTC thermistor 1 in that the thickness of the thermistor element 2 is thick. In the chip NTC thermistor 1A, since the thermistor layer 21 between the internal electrodes 5 and 6 is thick, the influence of the thickness fluctuation on the resistance value is small.

Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the gist described in each claim is modified or applied to others without changing the gist. There may be.

In the above embodiment, the internal electrode 5 has a proximal end portion 11, and the facing portion 12 is electrically connected to the terminal electrode 3 via the proximal end portion 11, but the present invention is not limited to this. .. For example, the internal electrode 5 does not have to have the proximal end portion 11, and the facing portion 12 is electrically connected to the terminal electrode 3 by being exposed to the end surface 2c and directly connected to the terminal electrode 3. May be.

In the above embodiment, the base end portion 14 of the internal electrode 6 is exposed to the end surface 2d and is directly connected to the terminal electrode 4, but the present invention is not limited to this, and the base end portion 14 may be electrically connected to the terminal electrode 4. .. That is, the base end portion 14 of the internal electrode 6 may be indirectly connected to the terminal electrode 4.

The region S where the tip portion 15 of the internal electrode 6 is located may be a region surrounded by at least a pair of facing portions 12, 12 and a connecting portion 13. For example, when the internal electrode 5 does not have the proximal end portion 11 and each facing portion 12 is exposed on the end surface 2c and is directly connected to the terminal electrode 3, the region S has sides 5d to 5f and the end surface. It may be a region partitioned by a part of 2c, that is, a region surrounded by a pair of facing portions 12, 12 and a connecting portion 13 and an end face 2c when viewed from the first direction X.

1,1A ... Chip NTC thermistor, 2 ... Thermistor prime field, 2a, 2b ... Main surface, 2c, 2d ... End surface, 2e, 2f ... Side surface, 3,4 ... Terminal electrode, 5,6 ... Internal electrode, 10 ... Conductor Part, 10a ... Opening, 12 ... Facing part, 13 ... Connecting part, 14 ... Base end part, 15 ... Tip part, 16 ... Narrow part, 21 ... Thermistor layer, R1, R2, R7, R8 ... Outer angle part, R3 to R6 ... Internal angle portion, W1 ... Separation width, W2 ... Width, S ... Region.

Claims (5)

A pair of main surfaces facing each other in the first direction, a pair of end faces facing each other in the second direction orthogonal to the first direction, and facing each other in the first direction and the third direction orthogonal to the second direction. With a pair of sides, with a thermistor prime,
The first and second terminal electrodes arranged on the corresponding end faces,
It comprises a first and second internal electrode disposed in the thermistor body and facing each other in the first direction.
The first internal electrode is electrically connected to the first terminal electrode and has a pair of facing portions facing each other in the third direction and a connecting portion connecting between the pair of facing portions. Have and
The second internal electrode includes a base end portion electrically connected to the second terminal electrode, a tip portion located at the tip end on the first terminal electrode side, and the base end portion and the tip end portion. It has a narrow portion extending between them and whose width in the third direction is narrower than the separation width of the pair of facing portions in the third direction.
When viewed from the first direction, the entire tip portion is located in a region surrounded by the pair of facing portions and the connecting portion, and the second internal electrode is located in the narrow portion. It overlaps with the connecting part and
An NTC thermistor having the same width of the base end portion in the third direction as the width of the tip portion and the narrow portion in the third direction, and narrower than the separation width. The NTC thermistor according to claim 1, wherein the second internal electrode does not overlap the pair of facing portions when viewed from the first direction. The thermistor prime field has a plurality of thermistor layers laminated in the first direction.
The NTC thermistor according to claim 1 or 2, wherein the region is filled with the thermistor layer. The NTC thermistor according to any one of claims 1 to 3, wherein the first and second internal electrodes have rounded corners. A pair of main surfaces facing each other in the first direction, a pair of end faces facing each other in the second direction orthogonal to the first direction, and facing each other in the first direction and the third direction orthogonal to the second direction. With a pair of sides, with a thermistor prime,
The first and second terminal electrodes arranged on the corresponding end faces,
It comprises a first and second internal electrode located in the thermistor body, electrically connected to the corresponding first and second terminal electrodes, and opposed to each other in the first direction.
The first internal electrode has a conductor portion and an opening formed inside the conductor portion.
The second internal electrode is connected to a narrow portion whose width in the third direction is narrower than the width of the opening in the third direction, and is connected to the narrow portion and is on the side of the first terminal electrode. It has a tip portion located at the tip of the above and a proximal end portion connected to the narrow portion and located on the second terminal electrode side.
When viewed from the first direction, the entire tip portion is located in the opening portion, and the second internal electrode overlaps the conductor portion in the narrow portion.
The width of the base end portion in the third direction is the same as the width of the tip portion and the narrow portion in the third direction, and the width of the opening portion in the third direction. Narrower than the NTC thermistor.

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