Feedthrough capacitor
A first external electrode is disposed on an end surface. A second external electrode is disposed on a side surface. The first external electrode includes a first sintered electrode layer, a second sintered electrode layer disposed on the first sintered electrode layer, and a plated layer disposed on the second sintered electrode layer. The second external electrode includes a third sintered electrode layer and a plated layer disposed on the third sintered electrode layer. The first, second, and third sintered electrode layers include a void. A void fraction of each of the first and third sintered electrode layers is larger than a void fraction of the second sintered electrode layer.
1. A feedthrough capacitor comprising:
an element body including a pair of end surfaces opposing each other, and at least one side surface located between the pair of end surfaces;
a pair of first external electrodes disposed on the pair of end surfaces, respectively;
a second external electrode spaced apart from the pair of first external electrodes and disposed on the side surface;
a first internal electrode disposed in the element body and including a pair of first portions exposed to the pair of end surfaces; and
a second internal electrode disposed in the element body to oppose the first internal electrode and including a second portion exposed to the side surface, wherein
each of the first external electrodes includes:
a first sintered electrode layer covering the corresponding first portion and being connected to the corresponding first portion;
a second sintered electrode layer disposed on the first sintered electrode layer; and
a plated layer disposed on the second sintered electrode layer,
the second external electrode includes:
a third sintered electrode layer covering the second portion and being connected to the second portion; and
a plated layer disposed on the third sintered electrode layer,
the first, second, and third sintered electrode layers include a void,
a void fraction of each of the first and third sintered electrode layers is larger than a void fraction of the second sintered electrode layer,
the void fraction of each of the first and third sintered electrode layers is 0.2 to 1.0%, and
the void fraction of the second sintered electrode layer is 0.02 to 0.18%.
2. The feedthrough capacitor according to claim 1 , wherein
a width of the second portion is smaller than a width of each of the first portions.
3. A feedthrough capacitor comprising:
an element body including a pair of end surfaces opposing each other, and at least one side surface located between the pair of end surfaces;
a pair of first external electrodes disposed on the pair of end surfaces, respectively;
a second external electrode spaced apart from the pair of first external electrodes and disposed on the side surface;
a first internal electrode disposed in the element body and including a pair of first portions exposed to the pair of end surfaces; and
a second internal electrode disposed in the element body to oppose the first internal electrode and including a second portion exposed to the side surface, wherein
each of the first external electrodes includes:
a first sintered electrode layer covering the corresponding first portion and being connected to the corresponding first portion;
a second sintered electrode layer disposed on the first sintered electrode layer; and
a plated layer disposed on the second sintered electrode layer,
the second external electrode includes:
a third sintered electrode layer covering the second portion and being connected to the second portion; and
a plated layer disposed on the third sintered electrode layer,
the first, second, and third sintered electrode layers include a void,
a void fraction of each of the first and third sintered electrode layers is larger than a void fraction of the second sintered electrode layer,
each of the first external electrodes includes a first conductor portion located on the corresponding the end surface,
the second external electrode includes a second conductor portion located on the side surface,
a surface area of the second conductor portion is smaller than a surface area of the first conductor portion, and
a surface roughness of the second conductor portion is larger than a surface roughness of the first conductor portion.
4. The feedthrough capacitor according to claim 3 , wherein
a width of the second portion is smaller than a width of each of the first portions.