US-20260128224-A1 - THREE-TERMINAL MULTILAYER CERAMIC CAPACITOR

US20260128224A1US 20260128224 A1US20260128224 A1US 20260128224A1US-20260128224-A1

Abstract

A three-terminal multilayer ceramic capacitor includes a first internal electrode layer including a first facing electrode portion, and first and second extracting electrode portions extending from the first facing electrode portion to a first end surface and a second end surface, respectively, and a second internal electrode layer including a second facing electrode portion facing the first facing electrode portion, and third and fourth extracting electrode portions extending from the second facing electrode portion to first and second side surfaces, respectively, wherein thicknesses of the third and fourth extracting electrode portions in the height direction x>thicknesses of the first and second extracting electrode portions in the height direction x>at least one among thicknesses of the first and second facing electrode portions in the height direction.

Inventors

Kentarou FUJIWARA
Takashi Sawada

Assignees

MURATA MANUFACTURING CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20260105
Priority Date: 20230710

Claims (17)

1 . A three-terminal multilayer ceramic capacitor comprising: a multilayer body including a plurality of ceramic layers that are laminated, a first main surface and a second main surface opposed to each other in a height direction, a first end surface and a second end surface opposed to each other in a length direction orthogonal or substantially orthogonal to the height direction, and a first lateral surface and a second lateral surface opposed to each other in a width direction orthogonal or substantially orthogonal to the height direction and the length direction; a plurality of first internal electrode layers each on a corresponding one of the plurality of ceramic layers and each extending toward the first end surface and the second end surface; a plurality of second internal electrode layers each on a corresponding one of the plurality of ceramic layers and each extending toward the first lateral surface and the second lateral surface; a first external electrode on the first end surface and connected to the plurality of first internal electrode layers; a second external electrode on the second end surface and connected to the plurality of first internal electrode layers; a third external electrode on the first lateral surface and connected to the plurality of second internal electrode layers; and a fourth external electrode on the second lateral surface and connected to the plurality of second internal electrode layers; wherein each of the plurality of first internal electrode layers includes a first counter electrode portion opposed to the plurality of second internal electrode layers, a first extension electrode portion extending from the first counter electrode portion toward the first end surface, and a second extension electrode portion extending from the first counter electrode portion toward the second end surface; each of the plurality of second internal electrode layers includes a second counter electrode portion opposed to the plurality of first counter electrode portion, a third extension electrode portion extending from the second counter electrode portion toward the first lateral surface, and a fourth extension electrode portion extending from the second counter electrode portion toward the second lateral surface; and a relationship is satisfied in which thicknesses of the third extension electrode portion and the fourth extension electrode portion in the height direction>thicknesses of the first extension electrode portion and the second extension electrode portion in the height direction≥at least one of a thickness of the first counter electrode portion or a thickness of the second counter electrode portion in the height direction.
2 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein the thicknesses of the first and second extension electrode portions in the height direction are each about 1.0 times or more and about 1.3 times or less than the thickness of the first counter electrode portion in the height direction.
3 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein the thicknesses of the third and fourth extension electrode portions in the height direction are each about 1.3 times or more and about 1.7 times or less than the of the second counter electrode portion in the height direction.
4 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein when a region in which a Ni content is about 10% or more with respect to a total of a Ni content and a Cu content is defined as a diffusion region of Ni; a second Ni diffusion distance in the width direction of Ni from the third extension electrode portion and the fourth extension electrode portion to the third external electrode and the fourth external electrode with reference to the first lateral surface and the second lateral surface of the multilayer body is about 1.05 times or more and about 1.4 times or less a first Ni diffusion distance in the length direction of Ni from the first extension electrode portion and the second extension electrode portion to the first external electrode and the second external electrode with reference to the first end surface and the second end surface of the multilayer body.
5 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of ceramic layers includes BaTiO 3 , CaTiO 3 , SrTiO 3 , or CaZrO 3 as a main component.
6 . The three-terminal multilayer ceramic capacitor according to claim 5 , wherein each of the plurality of ceramic layers includes a Mn compound, a Fe compound, a Cr compound, a Co compound, or a Ni compound as a subcomponent.
7 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of ceramic layers is about 0.3 μm or more and about 5.0 μm or less.
8 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of first and second internal electrode layers includes Ni as a main component, and Cu, Ag, Pd, or Au, or an alloy including at least one of Cu, Ag, Pd, or Au.
9 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of first and second internal electrode layers is about 0.30 μm or more and about 1.0 μm or less.
10 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein each of the first, second, third, and fourth external electrodes includes a base electrode layer including a metal component and a glass component, and a plated layer on a surface of the base electrode layer.
11 . The three-terminal multilayer ceramic capacitor according to claim 10 , wherein the glass component includes at least one of B, Si, Ba, Mg, Al, or Li.
12 . The three-terminal multilayer ceramic capacitor according to claim 10 , wherein the metal component includes at least one of Ni, Ag, Pd, an Ag—Pd alloy, or Au.
13 . The three-terminal multilayer ceramic capacitor according to claim 10 , wherein a thickness of the base electrode layer is about 3 μm or more and about 20 μm or less.
14 . The three-terminal multilayer ceramic capacitor according to claim 10 , wherein the plated layer includes a lower plated layer and an upper plated layer on the lower plated layer.
15 . The three-terminal multilayer ceramic capacitor according to claim 14 , wherein the lower plated layer includes Ni and the upper plated layer includes Sn.
16 . The three-terminal multilayer ceramic capacitor according to claim 14 , wherein a thickness of each of the lower plated layer and the upper plated layer is about 2.0 μm or more and about 15.0 μm or less.
17 . The three-terminal multilayer ceramic capacitor according to claim 1 , wherein a dimension of the three-terminal multilayer ceramic capacitor in the length direction is about 1.05 mm or more and about 1.35 mm or less; a dimension of the three-terminal multilayer ceramic capacitor in the height direction is about 0.45 mm or more and about 0.90 mm or less; and a dimension of the three-terminal multilayer ceramic capacitor in the width direction is about 0.60 mm or more and about 0.95 mm or less.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority to Japanese Patent Application No. 2023-112814 filed on Jul. 10, 2023 and is a Continuation Application of PCT Application No. PCT/JP2024/016301 filed on Apr. 25, 2024. The entire contents of each application are hereby incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to three-terminal multilayer ceramic capacitors. 2. Description of the Related Art Japanese Unexamined Patent Application Publication No. 2022-39808 discloses a multilayer feedthrough ceramic capacitor having a general configuration, that is, a three-terminal multilayer ceramic capacitor. The three-terminal multilayer ceramic capacitor includes a multilayer body and external electrodes provided on an outer surface of the multilayer body. The multilayer body includes an inner layer portion and outer layer portions sandwiching the inner layer portion in the lamination direction. In the inner layer portion, a plurality of internal electrode layers are alternately provided with a corresponding one of plurality of ceramic layers interposed therebetween, and are connected to external electrodes. Further, the multilayer body includes an outer surface including first and second main surfaces opposed to each other, first and second lateral surfaces opposed to each other, and first and second end surfaces opposed to each other. The internal electrode layers include a plurality of first internal electrode layers and a plurality of second internal electrode layers. The plurality of first internal electrode layers and the plurality of second internal electrode layers are alternately laminated in a predetermined lamination direction with a corresponding one of the plurality of ceramic layers interposed therebetween. The first internal electrode layers are exposed at the first and second end surfaces, and the second internal electrode layers are exposed at the first and second lateral surfaces. The first internal electrode layers are connected to the first and second external electrodes at the first and second end surfaces, respectively. The second internal electrode layers are connected to the third and fourth external electrodes on the first and second lateral surfaces, respectively. In Japanese Unexamined Patent Application Publication No. 2022-39808, in the second internal electrode layers, the thickness of each of the extension regions exposed at the first and second lateral surfaces is greater than the thickness of the middle portion sandwiched between the extension regions. This improves the connectivity between the second internal electrode layers and the third and fourth external electrodes. However, it is desired to further improve the moisture resistance reliability of the three-terminal multilayer ceramic capacitor. SUMMARY OF THE INVENTION Example embodiments of the present invention provide three-terminal multilayer ceramic capacitors each with improved moisture resistance reliability. A three-terminal multilayer ceramic capacitor according to an example embodiment of the present invention includes a multilayer body including a plurality of ceramic layers that are laminated, a first main surface and a second main surface opposed to each other in a height direction, a first end surface and a second end surface opposed to each other in a length direction orthogonal or substantially orthogonal to the height direction, and a first lateral surface and a second lateral surface opposed to each other in a width direction orthogonal or substantially orthogonal to the height direction and the length direction, a plurality of first internal electrode layers each on a corresponding one of the plurality of ceramic layers and each extending toward the first end surface and the second end surface, a plurality of second internal electrode layers each on a corresponding one of the plurality of ceramic layers and each extending toward the first lateral surface and the second lateral surface, a first external electrode on the first end surface and connected to the plurality of first internal electrode layers, a second external electrode on the second end surface and connected to the plurality of first internal electrode layers, a third external electrode on the first lateral surface and connected to the plurality of second internal electrode layers, a fourth external electrode on the second lateral surface and connected to the plurality of second internal electrode layers, in which each of the plurality of first internal electrode layers includes a first counter electrode portion opposed to the plurality of second internal electrode layers, a first extension electrode portion extending from the first counter electrode portion toward the first end surface, and a second extension electrode portion extending from the first counter electrode portion toward the second end surface, each of the plurality of second i