Multilayer ceramic capacitor and mounted structure with multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-10083795-B2
Application number	US-201514867277-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Sep 30, 2014
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A multilayer ceramic capacitor includes a ceramic body which is unlikely to be cracked. A dimension in a length direction L is referred to as L0. A distance in the length direction L is referred to as L1 between an end in the length direction L of a portion of a first external electrode located on a first principal surface and an end of a second internal electrode closer to the first end surface. The ratio L1/L0 is about 0.05 to about 0.35.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a ceramic body including first and second principal surfaces extending in a length direction and a width direction, first and second side surfaces extending in the length direction and a height direction; and first and second end surfaces extending in the width direction and the height direction;
a first internal electrode extending in the length direction and the width direction, provided in the ceramic body, and exposed at the first end surface;
a second internal electrode extending in the length direction and the width direction, provided in the ceramic body, exposed at the second end surface, and the second internal electrode facing the first internal electrode in the height direction with a ceramic portion interposed therebetween;
a first external electrode connected to the first internal electrode, and provided over the first end surface and over a portion of each of the first and second principal surfaces; and
a second external electrode connected to the second internal electrode, and provided over the second end surface and over a portion of each of the first and second principal surfaces; wherein
the first external electrode includes a first base layer provided over a portion of the ceramic body and including a metal and glass, and a first Cu plated layer located outermost;
the second external electrode includes a second base layer provided over a portion of the ceramic body and including a metal and glass, and a second Cu plated layer located outermost; and
a dimension of the multilayer ceramic capacitor in the length direction is denoted by L0, and a distance in the length direction between an end in the length direction of a portion of the first external electrode located on the first principal surface and an end of the second internal electrode closer to the first end surface is denoted by L1 in a cross section passing through a center of the multilayer ceramic capacitor in the width direction and extending in the length direction and the height direction; and
a ratio of L1/L0 is about 0.05 to about 0.35.

2. The multilayer ceramic capacitor according to claim 1 , wherein a dimension in the height direction of the ceramic body is equal or less than about 0.11 mm.

3. The multilayer ceramic capacitor according to claim 1 , wherein a length of the first external electrode in the length direction is referred to as LE1 as viewed from the second principal surface;
a length of the first external electrode in the length direction is referred to as LE2 as viewed from the first principal surface;
a length of the second external electrode in the length direction is referred to as LE3 as viewed from the second principal surface;
a length of the second external electrode in the length direction is referred to as LE4 as viewed from the first principal surface;
a distance in the length direction between a thickest portion of the first external electrode located on the second principal surface and an outermost end of the first external electrode in the length direction is referred to as LE5;
a distance in the length direction between a thickest portion of the first external electrode located on the first principal surface and the outermost end of the first external electrode in the length direction is referred to as LE6;
a distance in the length direction between a thickest portion of the second external electrode located on the second principal surface and an outermost end of the second external electrode in the length direction is referred to as LE7;
a distance in the length direction between a thickest portion of the second external electrode located on the first principal surface and the outermost end of the second external electrode in the length direction is referred to as LE8; and
a ratio of an absolute value of a difference between LE5 and LE6 to longer one of LE1 and LE2 ((absolute value of difference between LE5 and LE6)/(longer one of LE1 and LE2)) is referred to as A1, a ratio of an absolute value of a difference between LE7 and LE8 to longer one of LE3 and LE4 ((absolute value of difference between LE7 and LE8)/(longer one of LE3 and LE4)) is referred to as A2; and
A1 is about 0.2 or less, and A2 is about 0.2 or less.

4. The multilayer ceramic capacitor according to claim 3 , wherein the multilayer ceramic capacitor is about 0.9 mm to about 1.1 mm in length dimension, about 0.4 mm to about 0.6 mm in width dimension, and about 0.085 mm to about 0.15 mm in height dimension.

5. The multilayer ceramic capacitor according to claim 1 , wherein the multilayer ceramic capacitor is about 0.9 mm to about 1.1 mm in length dimension, about 0.4 mm to about 0.6 mm in width dimension, and about 0.085 mm to about 0.15 mm in height dimension.

6. The multilayer ceramic capacitor according to claim 1 , wherein
a height of an effective portion that is a portion of the ceramic body where the first and second internal electrodes overlap each other in the height direction is referred to as A in the height direction; and
a height of a first outer layer portion that is a portion of the ceramic body located between the first principal surface and the effective portion is referred to as B in the height direction; and
a height of a second outer layer portion that is a portion of the ceramic body located between the second principal surface and the effective portion is referred to as C in the height direction;
each of ratios A/B and A/C is within the range of about 0.5 to about 16.

7. The multilayer ceramic capacitor according to claim 1 , wherein
the multilayer ceramic capacitor is about 0.9 mm or more and about 1.1 mm or less in length dimension, about 0.4 mm or more and about 0.6 mm or less in width dimension, and about 0.085 mm or more and about 0.11 mm or less in a dimension in height dimension;
a maximum distance from the first principal surface to an internal electrode closest to the first principal surface among the first internal electrode and the second internal electrode in the height direction is referred to as T MAX ; and
a minimum distance from the first principal surface to the internal electrode closest to the first principal surface in the height direction is referred to as T MIN ;
a distance from the first principal surface to the second principal surface in the height direction is referred to as T; and
a ratio (T MAX −T MIN )/T is about 1.0% to about 5.0%.

8. The multilayer ceramic capacitor according to claim 1 , wherein
the multilayer ceramic capacitor is about 0.9 mm or more and about 1.1 mm or less in length dimension, about 0.4 mm or more and about 0.6 mm or less in width dimension, and about 0.12 mm or more and about 0.15 mm or less in a dimension in height dimension;
a maximum distance from the first principal surface to an internal electrode closest to the first principal surface among the first internal electrode and the second internal electrode in the height direction is referred to as T MAX ; and
a minimum distance from the first principal surface to the internal electrode closest to the first principal surface in the height direction is referred to as T MIN ;
a distance from the first principal surface to the second principal surface in the height direction is referred to as T; and
a ratio (T MAX −T MIN )/T is about 1.3% to about 5.3%.

9. The multilayer ceramic capacitor according to claim 1 , wherein
the multilayer ceramic capacitor is about 0.9 mm or more and about 1.1 mm or less in length dimension, about 0.4 mm or more and about 0.6 mm or less in width dimension, and about 0.18 mm or more and about 0.20 mm or less in a dimension in height dimension;
a maximum distance from the first principal surface to an internal ele

Assignees

• Murata Manufacturing Co

Inventors

• Itamura Hiroto

Classifications

• H01G4/12 Primary

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/2325

  characterised by the material of the terminals · CPC title

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title