Composite electronic component

Patent metadata

Field	Value
Publication number	US-10176927-B2
Application number	US-201615134850-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	May 21, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A coil portion providing a common mode choke coil and a protection element portion providing ESD protection elements are disposed so as to be aligned in a lamination direction of a component body. The ESD protection elements are composed of a ground electrode and discharge electrodes each located so as to be spaced apart from the ground electrode at a predetermined interval. Capacitor electrodes are provided so as to be opposed to the discharge electrodes thereby to form capacitors, and the capacitors and coil conductors of the common mode choke coil form an LC filter. Accordingly, noise removal characteristics are caused to have higher attenuation and a wider band than with a mere inductor.

First claim

What is claimed is:

1. A composite electronic component obtained by combining a common mode choke coil and an electrostatic discharge protection element, the composite electronic component comprising:
a component body having a laminated structure composed of a plurality of laminated insulating layers, wherein
a coil portion providing the common mode choke coil and a protection element portion providing the electrostatic discharge protection element are disposed so as to be aligned in a lamination direction of the component body,
in the coil portion, first and second coil conductors forming the common mode choke coil and magnetically coupled to each other are provided within the component body,
in the protection element portion, a ground electrode and first and second discharge electrodes forming the electrostatic discharge protection element are provided within the component body, each of the first and second discharge electrodes being located so as to be spaced apart from the ground electrode at a predetermined interval,
a first capacitor electrode is formed in the protection element portion and opposed to at least portions of the first and second discharge electrodes via the insulating layer in the lamination direction,
first to fourth coil terminals and a ground terminal are provided on an outer surface of the component body,
the first coil terminal is electrically connected to one end of the first coil conductor and the first discharge electrode,
the second coil terminal is electrically connected to one end of the second coil conductor and the second discharge electrode,
the third coil terminal is electrically connected to another end of the first coil conductor,
the fourth coil terminal is electrically connected to another end of the second coil conductor,
the ground terminal is electrically connected to the ground electrode and the first capacitor electrode,
the component body has a laminated structure in which a nonmagnetic portion is interposed between magnetic portions in the lamination direction, and
the coil portion is disposed in the nonmagnetic portion.

2. The composite electronic component according to claim 1 , wherein
in the protection element portion, third and fourth discharge electrodes forming the electrostatic discharge protection element and each located so as to be spaced apart from the ground electrode at a predetermined interval are further provided within the component body,
the third coil terminal is further electrically connected to the third discharge electrode, and
the fourth coil terminal is further electrically connected to the fourth discharge electrode.

3. The composite electronic component according to claim 2 , wherein the first capacitor electrode is opposed to not only the at least portions of the first and second discharge electrodes but also at least portions of the third and fourth discharge electrodes via the insulating layer in the lamination direction.

4. The composite electronic component according to claim 1 , wherein
the component body has a substantially rectangular parallelepiped shape having first and second principal surfaces opposed to each other, first and second side surfaces opposed to each other, and first and second end surfaces opposed to each other, the first and second side surfaces and the first and second end surfaces connecting between the first and second principal surfaces,
the first and second coil terminals are provided on the first side surface, and the third and fourth coil terminals are provided on the second side surface, and
the ground terminal is provided on at least one of the first and second end surfaces.

5. The composite electronic component according to claim 4 , wherein the ground terminal is provided on both of the first and second end surfaces.

6. The composite electronic component according to claim 1 , wherein an electrostatic capacity obtained between the ground terminal and one coil terminal of the first to fourth coil terminals is not less than 0.2 pF and not greater than 4.0 pF.

7. The composite electronic component according to claim 1 , wherein an electrostatic capacity obtained between the ground terminal and one coil terminal of the first to fourth coil terminals is not less than 0.2 pF and not greater than 0.8 pF.

8. The composite electronic component according to claim 1 , wherein an interval between the capacitor electrode and the electrode opposed to the capacitor electrode so as to form an electrostatic capacity between the electrode and the capacitor electrode is not less than 8 μm and not greater than 30 μm.

9. A composite electronic component obtained by combining a common mode choke coil and an electrostatic discharge protection element, the composite electronic component comprising:
a component body having a laminated structure composed of a plurality of laminated insulating layers, wherein
a coil portion providing the common mode choke coil and a protection element portion providing the electrostatic discharge protection element are disposed so as to be aligned in a lamination direction of the component body,
in the coil portion, first and second coil conductors forming the common mode choke coil and magnetically coupled to each other are provided within the component body,
in the protection element portion, a ground electrode and first and second discharge electrodes forming the electrostatic discharge protection element are provided within the component body, each of the first and second discharge electrodes being located so as to be spaced apart from the ground electrode at a predetermined interval,
a first capacitor electrode is formed in the protection element portion and opposed to at least portions of the first and second discharge electrodes via the insulating layer in the lamination direction,
first to fourth coil terminals and a ground terminal are provided on an outer surface of the component body,
the first coil terminal is electrically connected to one end of the first coil conductor and the first discharge electrode,
the second coil terminal is electrically connected to one end of the second coil conductor and the second discharge electrode,
the third coil terminal is electrically connected to another end of the first coil conductor,
the fourth coil terminal is electrically connected to another end of the second coil conductor, and
the ground terminal is electrically connected to the ground electrode and the first capacitor electrode, further comprising:
at least one second capacitor electrode electrically connected to at least one coil terminal of the first to fourth coil terminals; and
a third capacitor electrode electrically connected to the ground terminal and opposed to the second capacitor electrode via the insulating layer, wherein

the second and third capacitor electrodes are disposed within the component body and at a side of the coil portion opposite to the protection element portion side.

10. A composite electronic component obtained by combining a common mode choke coil and an electrostatic discharge protection element, the composite electronic component comprising:
a component body having a laminated structure composed of a plurality of laminated insulating layers, wherein
a coil portion providing the common mode choke coil and a protection element portion providing the electrostatic discharge protection element are disposed so as to be aligned in a lamination direction of the component body,
in the coil portion, first and second coil conductors forming the common mode choke coil and magnetically coupled to each other are provided within the component body,
in the protection element portion, a ground electrode and first and second discharge electro

Assignees

• Murata Manufacturing Co

Inventors

• Matsunaga Minoru

Classifications

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H03H2001/0085

  Multilayer, e.g. LTCC, HTCC, green sheets · CPC title

• H01F27/2804

  Printed windings · CPC title

• H02H9/046

  responsive to excess voltage appearing at terminals of integrated circuits · CPC title

• H01G4/005

  Electrodes · CPC title