ESD protective device

Patent metadata

Field	Value
Publication number	US-9780533-B2
Application number	US-201514972517-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Jul 8, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An ESD protective device is provided which can lower a discharge start voltage. In an ESD protective device 1 , first and second discharge electrodes 3 and 4 are disposed in a substrate 2 in a spaced relation with a discharge gap G interposed therebetween, and a conductor 9 is arranged around the discharge gap G. The conductor 9 has a nonlinear sectional shape in a section of the substrate 2 extending in a direction interconnecting a first principal surface 2 a and a second principal surface 2 b of the substrate 2 and passing the discharge gap G.

First claim

The invention claimed is:

1. An ESD protective device comprising:
a substrate having a first principal surface and a second principal surface, the second principal surface being positioned on a side opposite to the first principal surface;
first and second discharge electrodes disposed in the substrate and arranged in a spaced relation with a discharge gap interposed therebetween;
first and second outer electrodes disposed on outer surfaces of the substrate and electrically connected to the first and second discharge electrodes, respectively; and
a conductor arranged around the discharge gap,
wherein the conductor has a nonlinear sectional shape in a section of the substrate extending in a direction interconnecting the first principal surface and the second principal surface of the substrate and passing the discharge gap.

2. The ESD protective device according to claim 1 , wherein, in the section, the sectional shape of the conductor includes a first conductor portion extending in a first direction, and a second conductor portion extending in a second direction different from the first direction.

3. The ESD protective device according to claim 1 , wherein the conductor surrounds the discharge gap and portions of the first and second discharge electrodes positioned in the discharge gap.

4. The ESD protective device according to claim 3 , wherein, in the section, the sectional shape of the conductor is a circular ring or a rectangular ring.

5. The ESD protective device according to claim 1 , wherein the substrate comprises a Low Temperature Co-fired Ceramic.

6. The ESD protective device according to claim 1 , wherein the discharge gap is positioned inside the substrate, and the first and second discharge electrodes are each led out to a lateral surface interconnecting the first principal surface and the second principal surface of the substrate.

7. The ESD protective device according to claim 6 , wherein the first and second discharge electrodes are disposed in a plane at a certain height position inside the substrate.

Assignees

• Murata Manufacturing Co

Inventors

• Yasunaka Katsumi
• Adachi Jun
• Tsukizawa Takayuki

Classifications

• H01T4/12 Primary

  hermetically sealed · CPC title

• H01T4/02

  Details · CPC title