Electronic component and method of manufacturing the same
AssigneeRenesas Electronics Corporation
InventorKenta Ogawa
Life of this patent
Estimating the term…
Abstract
An external terminal of an electronic component is provided with a lead base material and a metal thin film coating a surface of the lead base material, and an average value of a crystal size index is not less than 7, which is defined based on dimensions of a crystal particle in a direction perpendicular to the lead base material surface and in a direction parallel thereto, taken on a cut surface of the metal thin film defined by a given plane cutting the metal thin film in a direction perpendicular to the lead base material surface. Such constitution provides an electronic component having an external terminal coated with a metal thin film of a simple structure constituted of Sn or a Sn-based and substantially Pb-free alloy, formed by plating on a surface of a lead base material.
Claims62
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including at least a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of a crystal size index is not less than 7 when said crystal size index is defined as (a+b)/2, where a and b respectively represent dimensions in μm of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including at least a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of Xh/Xv is not less than 4, where Xv and Xh respectively represent dimensions of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including at least a first layer constituted of a material substantially Pb-free and predominantly composed of tin, wherein said first layer is formed by plating, and a total extended length of a crystal particle boundary of said first layer is not more than 300 μm per 1000 μm2 of observation area, on a cut surface parallel to a surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including at least a first layer constituted of a material substantially Pb-free and predominantly composed of tin, wherein said first layer in said metal thin film has an amorphous structure.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film coating a surface of said lead base material, said metal thin film including at least a first layer constituted of a material substantially Pb-free and predominantly composed of tin, said first layer being formed by an electrolytic plating process,
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density not greater than 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of a crystal size index is not less than 7 when said crystal size index is defined as (a+b)/2, where a and b respectively represent dimensions in μm of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface, and
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of Xh/Xv is not less than 4, where Xv and Xh respectively represent dimensions of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface, and
- wherein said first layer is composed of a plurality of the crystal particle arranged in a single layer on said surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said first layer is formed by plating, and a total extended length of a crystal particle boundary of said first layer is not more than 300 μm per 1000 μm2 of observation area, on a cut surface parallel to a surface of said lead base material, and
- wherein said first layer is composed of a crystal particle arranged in a single layer on said surface of said lead base material.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film coating a surface of said lead base material, said metal thin film including a first layer constituted of a material substantially Pb-free and predominantly composed of tin, said first layer being composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material, and said first layer being formed by an electrolytic plating process,
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density not greater than 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said lead base material comprises a plated layer underlying said first layer on which said first layer is formed, and
- wherein an average value of a crystal size index is not less than 7 when said crystal size index is defined as (a+b)/2, where a and b respectively represent dimensions in μm of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said lead base material comprises a plated layer underlying said first layer on which said first layer is formed, and
- wherein an average value of Xh/Xv is not less than 4, where Xv and Xh respectively represent dimensions of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said lead base material comprises a plated layer underlying said first layer on which said first layer is formed, and
- wherein said first layer is formed by plating, and a total extended length of a crystal particle boundary of said first layer is not more than 300 μm per 1000 μm2 of observation area, on a cut surface parallel to a surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said lead base material comprises a plated layer underlying said first layer on which said first layer is formed, and
- wherein said first layer in said metal thin film has an amorphous structure.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film coating a surface of said lead base material, said metal thin film including a first layer constituted of a material substantially Pb-free and predominantly composed of tin, said first layer being composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material, and said first layer being formed by an electrolytic plating process,
- wherein said lead base material comprises a plated layer underlying said first layer on which said first layer is formed, and
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density not greater than 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material, said metal thin film being composed only of a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of a crystal size index is not less than 7 when said crystal size index is defined as (a+b)/2, where a and b respectively represent dimensions in μm of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material, said metal thin film being composed only of a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of Xh/Xv is not less than 4, where Xv and Xh respectively represent dimensions of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material, said metal thin film being composed only of a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said first layer is formed by plating, and a total extended length of a crystal particle boundary of said first layer is not more than 300 μm per 1000 μm2 of observation area, on a cut surface parallel to a surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material, said metal thin film being composed only of a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said first layer in said metal thin film has an amorphous structure.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film coating a surface of said lead base material, said metal thin film being composed only of a first layer constituted of a material substantially Pb-free and predominantly composed of tin, said first layer being composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material, and said first layer being formed by an electrolytic plating process,
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density not greater than 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of a crystal size index is not less than 7 when said crystal size index is defined as (a+b)/2, where a and b respectively represent dimensions in μm of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface,
- wherein said crystal particle is comprised of a columnar structure, and
- wherein said first layer is composed of a plurality of columnar crystal particles arranged in a single layer on said surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein an average value of Xh/Xv is not less than 4, where Xv and Xh respectively represent dimensions of a crystal particle constituting said first layer in a direction perpendicular to said lead base material surface and in a direction parallel thereto, taken on a cut surface of said first layer defined by a given plane cutting said first layer in a direction perpendicular to said lead base material surface,
- wherein said crystal particle is comprised of a columnar structure, and
- wherein said first layer is composed of a plurality of columnar crystal particles arranged in a single layer on said surface of said lead base material.
An electronic component comprising an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film coating a surface of said lead base material and including a first layer constituted of a material substantially Pb-free and predominantly composed of tin,
- wherein said first layer is formed by plating, and a total extended length of a crystal particle boundary of said first layer is not more than 300 μm per 1000 μm2 of observation area, on a cut surface parallel to a surface of said lead base material, and
- wherein said first layer is composed of a plurality of columnar crystal particles arranged in a single layer on said surface of said lead base material.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film coating a surface of said lead base material, said metal thin film including a first layer constituted of a material substantially Pb-free and predominantly composed of tin, said first layer being composed of a plurality of columnar crystal particles arranged in a single layer on said surface of said lead base material, and said first layer being formed by an electrolytic plating process,
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density not greater than 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of a crystal size index of a crystal particle constituting said first layer is greater than or equal to 7 μm,
- wherein said crystal size index defines a value obtained by dividing a sum of a size in a first direction and a size in a second direction by 2, in said crystal particle seen in a cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first direction is a direction, which is perpendicular to said surface of said lead base material;
- and
- wherein said second direction is a direction, which is parallel to said surface of said lead base material.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of Xh/Xv of a crystal particle constituting said first layer is greater than or equal to 4,
- wherein Xv is a size in a first direction perpendicular to said surface of said lead base material, in said crystal particle seen in a cross section of said first layer;
- wherein Xh is a size in a second direction parallel to said surface of said lead base material, in said crystal particle seen in said cross section of said first layer;
- and
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein said first layer is formed by plating;
- wherein a total extended length of a crystal particle boundary of said first layer is less than or equal to 300 μm per 1000 μm2 of observation area;
- and
- wherein said observation area is a cut surface parallel to said surface of said lead base material.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- and
- wherein said first layer in said metal thin film has an amorphous structure.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of a crystal size index of a crystal particle constituting said first layer is greater than or equal to 7 μm,
- wherein said crystal size index defines a value obtained by dividing a sum of a size in a first direction and a size in a second direction by 2, in said crystal particle seen in a cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first direction is a direction, which is perpendicular to said surface of said lead base material;
- wherein said second direction is a direction, which is parallel to said surface of said lead base material;
- and
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of Xh/Xv of a crystal particle constituting said first layer is greater than or equal to 4,
- wherein Xv is a size in a first direction perpendicular to said surface of said lead base material, in said crystal particle seen in a cross section of said first layer;
- wherein Xh is a size in a second direction parallel to said surface of said lead base material, in said crystal particle seen in said cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- and
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein said first layer is formed by plating;
- wherein a total extended length of a crystal particle boundary of said first layer is less than or equal to 300 μm per 1000 μm2 of observation area;
- wherein said observation area is a cut surface parallel to said surface of said lead base material;
- and
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material.
A method of manufacturing an electronic component comprising an external terminal, including a lead base material constituted of a predetermined metal material and a metal thin film covering a surface of said lead base material, said metal thin film having a first layer made of a material substantially Pb-free and made of a material predominantly composed of tin, said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material, and said first layer being formed by an electrolytic plating process,
- wherein said electrolytic plating process for forming said first layer includes an initial plating step of supplying a current having a current density less than or equal to 1 A/dm2 during an initial stage of a predetermined duration of time.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of a crystal size index of a crystal particle constituting said first layer is greater than or equal to 7 μm,
- wherein said crystal size index defines a value obtained by dividing a sum of a size in a first direction and a size in a second direction by 2, in said crystal particle seen in a cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first direction is a direction, which is perpendicular to said surface of said lead base material;
- wherein said second direction is a direction, which is parallel to said surface of said lead base material;
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material;
- and
- wherein said first layer is the uppermost layer to be contacted with a solder.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of Xh/Xv of a crystal particle constituting said first layer is greater than or equal to 4,
- wherein Xv is a size in a first direction perpendicular to said surface of said lead base material, in said crystal particle seen in a cross section of said first layer;
- wherein Xh is a size in a second direction parallel to said surface of said lead base material, in said crystal particle seen in said cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material;
- and
- wherein said first layer is the uppermost layer to be contacted with a solder.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of a crystal size index of a crystal particle constituting said first layer is greater than or equal to 7 μm,
- wherein said crystal size index defines a value obtained by dividing a sum of a size in a first direction and a size in a second direction by 2, in said crystal particle seen in a cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first direction is a direction, which is perpendicular to said surface of said lead base material;
- wherein said second direction is a direction, which is parallel to said surface of said lead base material;
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material;
- and
- wherein said average value of said crystal size index is obtained by continuously arranged crystal particles more than or equal to 5 particles.
An electronic component, comprising:
- an external terminal including a lead base material constituted of a predetermined metal material, and a metal thin film covering a surface of said lead base material,
- wherein said metal thin film has a first layer made of a material substantially Pb-free;
- wherein said first layer is made of a material predominantly composed of tin;
- wherein an average value of Xh/Xv of a crystal particle constituting said first layer is greater than or equal to 4,
- wherein Xv is a size in a first direction perpendicular to said surface of said lead base material, in said crystal particle seen in a cross section of said first layer;
- wherein Xh is a size in a second direction parallel to said surface of said lead base material, in said crystal particle seen in said cross section of said first layer;
- wherein said cross section of said first layer is a given surface cutting said first layer in said first direction;
- wherein said first layer is composed of a plurality of crystal particles arranged in a single layer on said surface of said lead base material;
- and
- wherein said average value of said crystal size index is obtained by continuously arranged crystal particles more than or equal to 5 particles.
Dependencies are inferred from the claim text.